ELECTRICAL INTERVIEW QUESTIONS & ANSWERS PART-2

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ELECTRICAL INTERVIEW QUESTIONS & ANSWERS PART-2

11. State Thevenin’sTheorem

According to thevenin’stheorem, the current flowing through a load resistanceConnected across any two terminals of a linear active bilateral network is the ratio open circuit voltage (i.e. the voltage across the two terminals when RL is removed) and sum of load resistance and internal resistance of the network.
It is given by Voc / (Ri+ RL).
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12. State Maximum power transfer theorem

The Maximum power transfer theorem explains about the load that a resistance will extract from the network. This includes the maximum power from the network and in this case the load resistance is being is equal to the resistance of the network and it also allows the resistance to be equal to the resistance of the network. This resistance can be viewed by the output terminals and the energy sources can be removed by leaving the internal resistance behind.
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13. Explain different losses in a transformer.

There are two types of losses occurring in transformer:
• Constant losses or Iron losses:
The losses that occur in the core are known as core losses or iron losses.
Two types of iron losses are:-
eddy current loss-Hysteresis loss.
These losses depend upon the supply voltage, frequency, core material and its construction. As long as supply voltage and frequency is constant, these losses remain the same whether the transformer is loaded or not. These are also known as constant losses.
• Variable losses or copper losses:
when the transformer is loaded, current flows in primary and secondary windings, there is loss of electrical energy due to the resistance of the primary winding, and secondary winding and they are called variable losses. These losses depend upon the loading conditions of the transformers. Therefore, these losses are also called as variable losses
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14. Explain different types of D.C motors? Give their applications

Different type of DC motors and their applications are as follows:-
• Shunt motors: It has a constant speed though its starting torque is not very high. Therefore, it is suitable for constant speed drive, where high starting torque is not required such as pumps, blowers, fan, lathe machines, tools, belt or chain conveyor etc.
• Service motors: It has high starting torque & its speed is inversely proportional to the loading conditions i.e. when lightly loaded, the speed is high and when heavily loaded, it is low. Therefore, motor is used in lifts, cranes, traction work, coal loader and coal cutter in coalmines etc.
• Compound motors: It also has high starting torque and variable speed. Its advantage is, it can run at NIL loads without any danger. This motor will therefore find its application in loads having high inertia load or requiring high intermittent torque such as elevators, conveyor, rolling mill, planes, presses, shears and punches, coal cutter and winding machines etc
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15. Explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.

Commutation: It is phenomenon when an armature coil moves under the influence of one pole-pair; it carries constant current in one direction. As the coil moves into the influence of the next pole-pair, the current in it must reverse.
This reversal of current in a coil is called commutation. Several coils undergo commutation simultaneously. The reversal of current is opposed by the static coil emfand therefore must be aided in some fashion for smooth current reversal, which otherwise would result in sparking at the brushes.
The aiding emfis dynamically induced into the coils undergoing commutation by means of compolesor interpoles, which are series excited by the armature current. These are located in the interpolarregion of the main poles and therefore influence the armature coils only when these undergo commutation.
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16. Comment on the working principle of operation of a single-phase transformer.

Working principle of operation of a single-phase transformer can be explained asAn AC supply passes through the primary winding, a current will start flowing in the primary winding. As a result, the flux is set. This flux is linked with primary and secondary windings. Hence, voltage is induced in both the windings. Now, when the load is connected to the secondary side, the current will start flowing in the load in the secondary winding, resulting in the flow of additional current in the secondary winding. Hence, according to Faraday’s laws of electromagnetic induction, emfwill be induced in both the windings.
The voltage induced in the primary winding is due to its self inductance and known as self induced emfand according to Lenze’slaw it will oppose the cause i.e. supply voltage hence called as back emf. The voltage induced in secondary coil is known as mutually induced voltage. Hence, transformer works on the principle of electromagnetic induction.
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17. Define the following terms:-Reliability, Maximum demand, Reserve-generating capacity,Availability (operational).

Reliability:
It is the capacity of the power system to serve all power demands without failure over long periods.
Maximum Demand:
It is maximum load demand required in a power station during a given period.
Reserve generating capacity:
Extra generation capacity installed to meet the need of scheduled downtimes for preventive maintenance is called reserve-generating capacity.
Availability:
As the percentage of the time a unit is available to produce power whether needed by the system or not.
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18. Mention the disadvantages of low power factor? How can it be improved?

Disadvantages of low power factor:
• Line losses are 1.57 times unity power factor.
• Larger generators and transformers are required.
• Low lagging power factor causes a large voltage drop, hence extra regulation equipment is required to keep voltage drop within prescribed limits.
• Greater conductor size: To transmit or distribute a fixed amount of power at fixed voltage, the conductors will have to carry more current at low power factor. This requires a large conductor size.
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19. State the methods of improving power factor?

Methods of improving power factor:
• By connecting static capacitors in parallel with the load operating at lagging power factor.
• A synchronous motor takes a leading current when over excited and therefore behaves like a capacitor.
• By using phase advancers to improve the power factor of induction motors. It provides exciting ampere turns to the rotor circuit of the motor. By providing more ampere-turns than required, the induction motor can be made to operate on leading power factor like an overexcited synchronous motor.
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20. State the factors, for the choice of electrical system for an aero turbine.

The choice of electrical system for an aero turbine is guided by three factors:
• Type of electrical output: dc, variable-frequency ac, and constant-frequency ac.
• Aero turbine rotational speed: constant speed with variable blade pitch, nearly constant speed with simpler pitch-changing mechanism or variable speed with fixed pitch blades.
• Utilization of electrical energy output: in conjunction with battery or other form of storage, or interconnection with power grid.
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21. What are the advantages of VSCF wind electrical system?

Advantages of VSCF wind electrical system are:• No complex pitch changing mechanism is needed.• Aero turbine always operates at maximum efficiency point.• Extra energy in the high wind speed region of the speed –duration curve can be extracted• Significant reduction in aerodynamic stresses, which are associated with constant –speed operation.
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22. Explain the terms real power, apparent power and reactive power for ac circuits and also the units used.

• Real Power:
It is the product of voltage, current and power factor
i.e. P = V I cosj and basic unit of real power is watt.
i.e. Expressed as W or kW.

• Apparent power:
It is the product of voltage and current. Apparent power = V I and basic unit of apparent power is volt-ampere. Expressed as VA or KVA.

• Reactive Power:
It is the product of voltage, current and sine of angle between the voltage and current i.e. Reactive power = voltage X current X sinjor Reactive power = V I sin j and has no other unit but expressed in VAR or KVAR.

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SCADA Questions and Answers

SCADA Questions and Answers

Architecture
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Is this Control and Monitoring system supplied as a single package?

Yes

How much does each additional driver cost?

Most are included.

Does the Control & Monitoring system use Client/Server distributed
processing?

Yes

Can the system be expanded, without re-engineering, to handle future
requirements?

Yes

How do we use the network to maximize the performance of the entire
Control and Monitoring system?

The server(s) can be redundant & additional performance (proxy) servers are connected via the network. ViewX Clients are connected via the network communicating with up
to 64 servers simultaneously. It finds the most efficient server to
connect to. The use of managed switches is used to make the network
more deterministic and help with security.

How can we add display clients without shutting down the system or
changing the software configuration?

The system is always online and
does not require restarting, rebooting, or reconfiguration for Clients to
connect. Each ViewX Client is licensed. WebX Clients (browser based)
are licensed by the number of concurrent users, how many users online
at any one time, and are “floating” on the server key.

Can I make changes to the system without shutting down?

Changes take place immediately as there is no compiling. If there are
redundant servers all changes are automatically sent to the Standby
servers.

How can we support nodes at remote locations?

Remote users are
connected via Display (ViewX) or Web Clients (WebX). The system
was designed to operate on low band-width Wide Area
Networks(WAN). Information is passed to Clients using a publish and
subscribe method and is report by exception. This dramatically
increases the performance, especially for remote users.
.
How can we exchange data with other applications?

 Exchange of data
with other applications and systems is done with OPC, ODBC (SQL),
or through an API. The OPC interface supports OPC-DA (Real-time
Data Access), OPC-HAD (Historical Data Access), and OPC-AE
(Alarms and Events)


Can other automation systems, like a DCS, communicate using
industry standard Communication drivers like Modbus or DNP3?


The system supports being a Modbus or DNP3 Slave so other systems
can connect and access real-time data. This is accomplished by
configuring a virtual device which only the points required for the
other system are mapped.

What external databases does the Control and Monitoring system
support?

Any ODBC compliant (SQL) database.

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Redundancy

How can we provide for data integrity and system control in the event
of hardware failure?

Data integrity & system control is maintained
through server mirrored redundancy. The system supports triple
mirrored server redundancy.

Are multiple copies of the configuration database required to enable
redundancy?

No, the redundancy is mirrored. Mirrored redundancy
means that no programming or extra database configuration is
required to make the redundancy work. All functions are available
from the standby or redundant server.
What happens if a computer (node or client) fails?

If a server fails, the
ViewX clients automatically connect to the standby server as soon as
the client detects that Main server has failed, transparent to the user.


How can we provide backup for critical tasks such as plant-floor I/O,
alarms and trends?

All server functions are mirrored to the
redundant server. The system provides for Data backups to Local or
Storage on a network client with backup device (like large hard drive
or tape).

When the primary Server fails, is there any loss of monitoring or
control before the redundant I/O Server assumes control?

No the transfer is transparent to the users and all functions are as normal.

When the primary and standby Servers are in operation, are they both
polling the I/O Devices (PLCs)?

No, only the server acting as Main will
communicate to the IO.

What happens to alarms monitoring if the primary alarms server fails?

The servers are mirrored and all functions are transferred
transparently to the users or functions ongoing.

What happens to trend data if the trend server fails?

All functions are
mirrored.

What happens if the LAN fails?

 If redundant LANs are installed the
transfer is transparent to the system.

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Configuration

How many applications do we require to configure a Control and
Monitoring system?

No other applications are need to configure the
system, Any ViewX Client can be used for configuration if that user
has permissions for configuration.

How can more than one engineer configure the system at the same
time?

The system is designed with an Integrated Development
Environment interface that provides for collaboration configuration
and control. This is not a problem.

Can we configure the system from any node?

All ViewX clients have
full configuration capacity with security.


Can we create descriptive tag names to incorporate a more meaningful
tag naming strategy?

Yes

If we need to make a configuration change to one data point, for
example,

does that changed need to be made on all nodes?

The system has only one configuration database and any change made
are automatically propagated to all servers and clients. Nothing else is
required.
.
Can we build display pages on one node and display them any node in
the system?

Yes assuming that the users on the other clients have
permissions to see the display page.


How do we backup/archive the system configuration information?

The
system has an Export function which allows saving the database to
any media.

How do we restore the system configuration and history in an event of
data loss?

Import the backup file or database.
How do we set up communication with an I/O Device (PLC)? The
system uses a browser design for an object. Define the object (main
directory), and define the individual parameters in subfolders. This
can be used as a template object so it can be reused in the system.

Can we control how the system polls the I/O Devices (PLCs)?

Yes and
the polling configuration is easily controlled by adjusting
communications parameters of the device.

Can we retain system values on disk at shutdown and restore them on
system restart?

Yes the system maintains all the last values of every
point in the system with a timestamp.

How many separate security areas can we define?

As many groups
and-or individual as is needed, no limit.

What elements of the system can we associate with security areas?

The security level can be defined down to the database point level.

How do we configure a system that only uses an industrial keyboard?

The system primary input is through the pointing device. A screen
keyboard can be implemented for function not on an external
keyboard.

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Graphics

First, the system graphic engine is vector graphics, not bitmap.
There is a 4 to 1 size difference in favor of smaller vector
graphic files. Only vector graphics can use a smooth zoom/pan
transition without distortion.

How many colors does the package have for building graphics displays?

True Color

How do we draw complex entities such as 3D pipes?

The 3D effects are
done with shading and sizing techniques like most artists do.

How easily can we construct intelligent objects that will save drawing
and configuration time?

Objects can be made into templates from which instances are created. Each instance contains all database
entries. Typically only addressing and selection of the physical IO
device are necessary.

Can we edit library objects and intelligent objects supplied with the
package?

 Yes, but it is recommended to copy/paste the original object
into the library and modify it as a new object; thereby, keeping the
original library.
If we change a library object or template object, are the changes

reflected throughout the system—or do we have to change every
occurrence of the object?

The changes will take affect immediately to
all other instances of object or template in the system.


Can we use Boolean and other arithmetic expressions when animating
data?

Yes

Can we apply multiple animations to the same object?

Yes

Can we disable (gray-out) command buttons on a graphics page?

 Yes

Can we create custom sliders?

Yes

What graphics file formats can we import into the graphics builder?

The AutoCAD, DXF, and all other graphics formats can be imported or
copied and pasted into the mimic. They will then allow smooth Zoom
with the vector graphic engine.

How do we recover from accidental deletion or moving of objects when
editing a complex display page?

The use of undo function is used to
reestablish deletions. We also support layers so graphics objects can
be put on separate layers to prevent accidental changes.

How do we align objects on the page?

Use a snap to grid or align the
object with the alignment tool.

How can we add special effects to text and other objects?

Special
effects are done with colors, lines, and shading.

How can we make a global change of one color for another in a object?

Special color tags may be created. When these are referred to
for colors, changing the tag color will change all instances that
use that color.

How can we edit a group of objects?

Objects with common
attributes can be selected, and the changes will apply to all in
the selected group..

When we resize an object or group of objects, how can we maintain
their aspect ratio?

The system uses vector graphics with zoom from 1%
to 3,200%. Maintaining the aspect ratio is a selectable property.


How can we display an animated sequence?

Animated sequences and
other functions are done without programming, but with IEC61131-3,
functional Block diagrams. The system writes the code. Visual Basic
Scripts (VBS) can also be used for those understanding VBS.

How far back can we undo an edits to a display page?

The undo is user
defined.
How can we configure a command that executes continually while a
graphics page is displayed? This is done via VBS, Functional Blocks.
Or scripts.

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Alarms

How are Alarms and hardware communications failures reported by
the Control and Monitoring system?

Alarms are reported and are
always visible on any page through the alarm banner which is
normally at the bottom of the page. There is an Alarm Management
system within the system that provides for alarm redirection, sorting,
filtering, filed editing, etc. Custom alarm lists can be embedded on any
page that is filtered for that specific page. For instance, you only what
to see the alarms that pertain to a specific substation or breaker.

Do we have to configure alarms for all items of hardware?

No

How can we display and process alarms to millisecond precision?

Yes

When an alarm is acknowledged at one operator station, is it
automatically acknowledged at all nodes (workstations) without
having to write programs or scripts?

Yes. This is true even on cluster
servers.

Can we provide help about specific alarms that the operators can
access easily?

Yes
Can we disable alarms?

Yes

How many logical alarms groups can we create?

 The system provides
for as many alarm groups as desired or individual & group.

How can we prioritize alarms?

Alarms can be prioritized by severity,
time, device, etc.

Can we send alarms to a printer and file as well as display them on the
screen?

 Yes and alarms can be sent out to groups or individuals via
Email, pager, and/or text messages to cell phones.

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Trends

What flexibility does the Control and Monitoring system provide for
defining trend data?

Any database object may be configured to be
placed in the Historian and trended. Any point in the system can also
be viewed using a feature called Current Trending which allows
operators to select a point to view the current trend of a point without
it being configured in the Historian.

How can we access trend data from any node in the system?

All clients (ViewX & WebX) with security may view Historical data.
What facilities are provided for handling trend data on the screen? All
trending is accessed through the Historian using standard menus
items. Data can be viewed in a list or graphically without custom
configuration. If needed, custom trend pages can be configured in the
system.

How do we display and extract historical data?

The Historical
database or Historian is a SQL accessible database. This allows SQL
queries to access the data and display it on screens. There are also
standard tools to extract the data so no SQL knowledge is required to
extract data. For instance, display the Maximum and Average can be
internal to a mimic or external to a mimic (a trend page to itself).

How do we archive and retrieve historical data?

Historical data is stored in weekly files on all the servers. The files can be archived or
restored at anytime without shutting down the system.

How long and what is keep in the Historian?

All data, reports,
configuration, and events etc. are stored in the one Historical database.
The data is actually stored in weekly files and the system is
configurable as to how many weeks are keep online. The default is 52
weeks but it is only limited to disk size. The Historian compresses the
data; hence, 10 years of most system are kept in 100 GB or less. This
is system dependent.

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Reports

What flexibility does the Control and Monitoring system provide for
defining reports?

The system has a Crystal Reports Runtime engine
embedded that provides for reports from any historian parameter.
Crystal Reports Developer is required to generate a new report design
then move the report template into the Historian for general reporting;
display, print, email, etc any report.

How can I include plant-floor data in a report?

Pull up a report
template and select the parameters to report, click generate report,
and the report data appears. For a large water system or electrical
system the full report is generated for distribution in less than 2
minutes.

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Performance

How does the Control and Monitoring system communicate with the
plant floor?

Communication with devices, plant floor, and other
devices is done by the selected fieldbus: RS-485 to devices converted to
Ethernet, direct Ethernet, cable, fiber, radio, or any usable media.
What is the fastest method of communicating with the plant floor?
Currently the fastest method of communication to devices and the
plant floor is via some media using Ethernet.

How do we ensure that data exchange with the plant-floor is
maximized?

The system provides a data quality parameter with most
protocols and devices.
Will the performance be maintained as the application grows? Using
managed switches and proper cabling performance is keep with
growth. For example, limiting the RS-485 devices to 5 or 6 units per
485 LAN connected to the Ethernet.

How many Serial Ports can I have connected to one PC?

The system is
designed around Ethernet as the input; therefore, serial data is
converted to Ethernet via serial to Ethernet converter.
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Language

What is the built in language (scripting engine) provide standard
programming facilities?

The system uses the IEC61131-3 (logic
engine) programming. Most customers use the “function block
programming” to write the functions desired that are not already in
the system or they use Visual Basic Script (VBS), but VBS requires
programming code knowledge.

Does the language provide total access to the system?

Yes, all data is
accessible in the database.

Can we write our own functions?

Yes

Can we use the same function in more than one place in the system?

Yes

Can we create tasks that are triggered by system events or run at
certain times?

Yes the system is event driven.

Can we activate other Windows applications

Yes, in fact, we launch
other manufacturer’s software to do many device specific functions like
waveform capture and harmonics.

Can we print a window dynamically?

Yes

Can we access the user(s) who are logged on to the system?

Yes

Can we use mail facilities?

Yes

Can we access the serial ports on the PC?.

Yes.

How do I configure data entry facilities?

By using a form or input
mimic.
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Feature Questions

Can the SCADA system import AutoCAD drawings and maps?

 Yes as
DXF file.

Does the system declutter when zooming in on a screen?

Yes.

AutoCAD and screens that have layers can make layers visable
the deeper the zoom.

Can the SCADA system do multiple applications and use the same
Historian?

Yes, the SCADA system can do Automatic Meter
Reading (AMR) for electric, water, and Gas, Power
Management (PMS), Substation Automation (SA), water
facilities, waste water facilities, industrial complexes, selected
process control, and many other detailed applications. The
system is very flexible and scalable from very small to huge.
On an SCADA/AMR system,

can the system do the customer billing?

Yes and No. The system, by itself, would not have a customer
linked database; therefore, billing is not possible. With
expansion of the system with a MS-SQL server that holds the
customer database, customer information is related to the
SCADA system Historian database via the meter ID, location,
and phone number, the system could do billing and provide


outage management with customer information. This would
have to be built for each application.

Can the system show a unit’s communication status?

Yes. The
communication status is show via color and a device
communication page or screen with more data quality
information.
Some additional important questions about protocols &
vendors are as follows:

Is IEC61850 & most company’s hardware & software interoperable
with other vendor's devices?

Yes, the 61850 protocol requires
this when the devices are certified compliant.

Where has IEC61850 been proven and with what vendor's devices?

Not in many places, TVA, 1 in Mexico and some others. Most
are working on the minor problem that happen in the
beginning shages of a new protocol.

Is IEC61850 being put into industrial sales instead of Modbus TCP/IP,
serial, and DNP 3.0?

 Yes, it will be a universal protocol when
the acceptance is present like DNP 3.0. The UCA will monitor
it like www.dnp.org is controlled.
IEC 61850 is designed for substations only and is Peer-to-Peer,

what security is present?

Data encryption.
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ELECTRICAL INTERVIEW QUESTIONS & ANSWERS PART-1

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1. Tell me about yourself?

It seems like an easy interview question. It's open ended: ”I can talk about whatever I want from the birth canal forward. Right?”

Wrong.

What the hiring manager really wants is a quick, two- to threeminute snapshot of who you are and why you're the best candidate for this position.So as you answer this question, talk about what you've done to prepare yourself to be the very best candidate for the position. Use an example or two to back it up. Then ask if they would like more details. If they do, keep giving them example after example of your background and experience. Always point back to an example when you have the opportunity.

"Tell me about yourself" does not mean tell me everything. Just tell me what makes you the best and fit the job requirements

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2. What is a differential amplifier? Also, explain CMRR.

Differential Amplifier: The amplifier, which is used to amplify the voltage difference between two input-lines neither of which is grounded, is called differential amplifier. This reduces the amount of noise injected into the amplifier, because any noise appearing simultaneously on both the inputterminals as the amplifying circuitry rejects it being a common mode signal.

CMRR: It can be defined as the ratio of differential voltage-gain to common made voltage gain. If a differential amplifier is perfect, CMRR would be infinite because in that case common mode voltage gain would be zero.

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3. Where do you see yourself in five years’ time?

 What the interviewer really wants is to see that you’ve thought about your future, and gauge your ambition. They also want to verify that this isn’t just a stop gap position.
Although all of your answers should be tailored to the organization and position you’ve applied for, this is especially the case with this question. If you’re going for an entry level position, for example,

explain how you’d like your career to progress (e.g. ‘I’d like to progress to a Senior Software Engineer’ or ‘I see myself being a team leader…’).
If you’re going for a more senior position, explain how you’d be looking to move the company forward. Have a look at their business strategy or corporate objectives before the interview, and explain how you can help in achieving them.

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4. Why star delta starter is preferred with induction motor?

Star delta starter is preferred with induction motor due to following reasons:
• Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses.
• Star delta starter circuit comes in circuit first during starting of motor, which reduces voltage 3 times, that is why current also reduces up to 3 times and hence less motor burning is caused.
• In addition, starting torque is increased and it prevents the damage of motor winding.

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5 . State the difference between generator and alternator

Generator and alternator are two devices, which converts mechanical energy into electrical energy. Both have the same principle of electromagnetic induction, the only difference is that their construction. Generator persists stationary magnetic field and rotating conductor which rolls on the armature with slip rings and brushes riding against each other, hence it converts the induced emf into dc current for external load whereas an alternator has a stationary armature and rotating magnetic field for high voltages but for low voltage output rotating armature and stationary magnetic field is used.

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6. Why AC systems are preferred over DC systems?

Due to following reasons, AC systems are preferred over DC systems:
a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution.
b. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission
c. From power stations, AC is produced so it is better to use AC then DC instead of converting it.
d. When a large fault occurs in a network, it is easier to interrupt in an AC system, as the sine wave current will naturally tend to zero at some point making the current easier to interrupt.

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7. How can you relate power engineering with electrical engineering?

Power engineering is a sub division of electrical engineering. It deals with generation, transmission and distribution of energy in electrical form. Design of all power equipments also comes under power engineering. Power engineers may work on the design and maintenance of the power grid
i.e. called on grid systems and they might work on off grid systems that are not connected to the system.

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8. What are the various kind of cables used for transmission?

Cables, which are used for transmitting power, can be categorized in three forms:
• Low-tension cables, which can transmit voltage upto 1000 volts.
• High-tension cables can transmit voltage upto 23000 volts.
• Super tension cables can transmit voltage 66 kV to 132 kV

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9. Why back emf used for a dc motor?

 highlight its significance. The induced emf developed when the rotating conductors of the armature between the poles of magnet, in a DC motor, cut the magnetic flux, opposes the current flowing through the conductor, when the armature rotates, is called back emf. Its value depends upon the speed of rotation of the armature conductors. In starting, the value of back emf is zero.

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16. Explain the application of storage batteries.

Storage batteries are used for various purposes, some of the applications are mentioned below:

• For the operation of protective devices and for emergency lighting at generating stations and substations.
• For starting, ignition and lighting of automobiles, aircrafts etc.
• For lighting on steam and diesel railways trains.
• As a supply power source in telephone exchange, laboratories and broad casting stations.
• For emergency lighting at hospitals, banks, rural areas where electricity supplies are not possible.

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चंद्रयान मिशन- 2 Complete MCQs in HINDI

चंद्रयान मिशन- 2

:tulसे :
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प्रश्न1 चंद्रयान मिशन 2 को कब लांच किया गया?
उत्तर- 22 जुलाई 2019
प्रश्न2 Chandrayaan-2 अभियान को भारत के किस शक्तिशाली रॉकेट से लांच किया गया?
उत्तर –GSLV मार्क 3

प्रश्न3 भारत की कौन सी संस्था ने चंद्रयान मिशन 2 को लॉन्च किया?
उत्तर- ISRO (भारतीय अंतरिक्ष अनुसंधान संगठन)


प्रश्न4 चंद्रयान-2 को किस अंतरिक्ष केंद्र से लांच किया गया?
उत्तर- सतीश धवन अंतरिक्ष केंद्र

प्रश्न5 चंद्रयान मिशन 2 को लॉन्च करने में कितना खर्च आया?
उत्तर- 960 करोड़ रुपए

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प्रश्न6 ISRO (भारतीय अंतरिक्ष अनुसंधान संगठन) का मुख्यालय कहां पर स्थित है?
उत्तर- बेंगलुरु

प्रश्न7 चंद्रयान-2 को कहां पर उतरना है?
उत्तर- चंद्रमा के दक्षिणी ध्रुव पर

प्रश्न8 चंद्रयान-2 अभियान को कहां से लांच किया गया?
उत्तर- श्रीहरिकोटा

प्रश्न9 सतीश धवन अंतरिक्ष केंद्र कहां पर स्थित है?
उत्तर- Andhra Pradesh

प्रश्न10 भारत का अंतरिक्ष मंत्रालय किसके पास है?
उत्तर- प्रधानमंत्री नरेंद्र मोदी

प्रश्न11 चंद्रयान मिशन 2 के प्रोजेक्ट डायरेक्टर कौन है?
उत्तर- एम वनीता और रितु करीधल

प्रश्न12 वर्तमान में ISRO (भारतीय अंतरिक्ष अनुसंधान संगठन) के अध्यक्ष कौन है?
उत्तर- के सिवन (2019)

प्रश्न13 चंद्रयान-2 को चंद्रमा के दक्षिणी ध्रुव पर पहुंचने में कितने दिन का समय लगेगा?
उत्तर- 53 से 54 दिन

प्रश्न14 चंद्रयान-2 अभियान भारत का चंद्रमा के लिए कौन सा मिशन होगा?
उत्तर- दूसरा

प्रश्न15 चंद्रयान मिशन1 कब लांच किया गया था?
उत्तर- 22 अक्टूबर 2008

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प्रश्न16 चंद्रयान-2 को कहां से लांच किया गया था?
उत्तर- सतीश धवन अंतरिक्ष केंद्र ( श्रीहरिकोटा)

प्रश्न17 चंद्रयान मिशन 1 को लांच करने में कितना खर्चा आया था?
उत्तर- 380 करोड़ रुपए

प्रश्न18 चंद्रयान मिशन 1 के समय इसरो के अध्यक्ष कौन थे?
उत्तर- जी माधवन नायर

प्रश्न19 चंद्रयान-2 को किस रॉकेट के जरिए लॉन्च किया गया था?
उत्तर- PSLV-C11

प्रश्न20 चंद्रयान-2 चंद्रमा पर कब पहुंचा था?
उत्तर- 22 अक्टूबर 2008 को

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प्रश्न21 चंद्रयान-2 की सफल सेंडिंग के साथ भारत चंद्रमा की सत्ता है पर पहुंचने वाला दुनिया का कौन सा देश बन जाएगा?
उत्तर- चौथा

प्रश्न22 चंद्रयान 2 के तीन मत्वपूर्ण हिस्से कौन से हैं?
उत्तर- ऑर्बिटर, लैंडिंग एवं रोवर

प्रश्न23 चंद्रयान मिशन 2 लैनडर का क्या नाम रखा गया है?
उत्तर- विक्रम

प्रश्न24 चंद्रयान-2 का हिस्सा ऑर्बिटल क्या कार्य करेगा?
उत्तर- चंद्रमा के चारों ओर चक्कर लगाएगा

प्रश्25 चंद्रयान-2 का हिस्सा लैनडर क्या कार्य करेगा?
उत्तर- चंद्रमा की सतह पर उतरेगा

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प्रश्न26 चंद्रयान-2 का हिस्सा रोवर क्या कार्य करेगा?
उत्तर- चंद्रमा की सतह पर उतरेगा और चलेगा

प्रश्न27 किस देश का चंद्रयान मिशन बेरेशीट असफल हो गया था?
उत्तर- इजराइल

प्रश्न28 चंद्रयान मिशन बेरेशीट को कब लॉन्च किया गया था?
उत्तर- 22 फरवरी को



प्रश्न29 पृथ्वी और चंद्रमा के बीच की दूरी कितनी है?
उत्तर- 384400 km

प्रश्न30 चंद्रमा से परावर्तित रोशनी पृथ्वी तक कितने समय में पहुंचती हैं?
उत्तर- 1.30 सेकंड

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प्रश्न31 चंद्रमा का गुरुत्वाकर्षण पृथ्वी की अपेक्षा कितना है?
उत्तर- 1\6


प्रश्न32 पृथ्वी की सतह से चांद का कितने प्रतिशत भाग दिखाई देता है?
उत्तर- 59%

प्रश्न33 चंद्रमा का व्यास कितना होता है?
उत्तर- 3478 किमी

प्रश्न34 चंद्रमा के वर्णन की विद्या को क्या कहा जाता है?
उत्तर- सेलेनोलॉजी (Selenology)

प्रश्न35 चांद पर कदम रखने वाला प्रथम इंसान नील आर्मस्ट्रांग किस अंतरिक्ष यान से चंद्रमा पर उतरे थे?
उत्तर- अपोलो11

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प्रश्न36 नील आर्मस्ट्रांग ने चांद पर कदम कब रखा था?
उत्तर- 20 जुलाई 1969

प्रश्न37 किसे जीवाश्म ग्रह के नाम से भी जाना जाता है?
उत्तर- चंद्रमा

प्रश्न38 चंद्रयान-2 का वजन कितना है?
उत्तर- 3877 किलोग्राम

प्रश्न39 चांद के दक्षिणी ध्रुव पर उतरने वाला दुनिया का पहला देश कौन बना है?
उत्तर- भारत

प्रश्न40 आर्बिटल का क्या काम है?
उत्तर- मुख्य उद्देश्य पृथ्वी और लैंडर के बीच कम्युनिकेशन करना।
:maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::maple_leaf::point_right:

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