Utilization of Electrical Energy MCQ PART-1 & 2

Utilization of Electrical Energy MCQ PART- 1

                                            PKR ELECTRICAL ENGINEERING
1)If a worker has suffered from electric shock, he should be
A.given a cold drink
B.kept warm and covered
C.made to walk
D.given an alcoholic drink
Answer-B

2)Which one of the following is a temporary joint
A.Welded joint
B.Press fit joint
C.Soldered joint
D.Riveted joint
Answer-B

3) Which type of fire extinguisher is used in a welding shop
A.Halon extinguisher
B.Foam type extinguisher
C.Dry powder extinguisher
D.Carbon Dioxide extinguisher
Answer-D

4) The arc utilized in electric arc welding is a
A.High voltage, high current discharge
B.Low voltage, low current discharge
C.Low voltage, high current discharge
 D.High voltage, low current discharge
Answer-C

5) Which one of the following is the type of transformer used in arc welding
 A.Step down
B.Step up
C.One-to-one
D.Capable of increasing supply voltage
Answer-A



6) The welding machine, which is used to convert AC welding supply to DC welding supply is
A.Engine generator set
B.Welding transformer
C.Rectifier set
D.Motor generator set
Answer-C

7) In DC welding heat distribution is possible between electrode and the base metal due to the change of polarity. The distribution of heat is
A.Positive 2/3 and negative 1/3
B.Positive 1/3 and negative 2/3
C.Positive 3/4 and negative 1/4
 D.Positive 1/4 and negative 3/4
Answer-A

8) The size of a welding machine is determined by
A.Open circuit voltage
B.Closed circuit voltage
C.Output amperage
 D.Input amperage
Answer-C

9) The position in which it is easiest to weld is
A.Horizontal
B.Overhead
C.Vertical
D.Flat
Answer-D

10) The electrode size refers to
A.diameter of its core wire
B.thickness of flux coating
C.diameter (overall) of electrode
D.length of electrode
Answer-A


11) One of the functions of electrode coating is
A.to prevent rusting
B.to stabilize the arc
C.to increase welding current
D.to control arc temperature
Answer-B

12) The electrodes are manufactured in two standard lengths namely
A.350 mm and 250 mm
B.350 mm and 450 mm
C.400 mm and 500 mm
D.12” and 10”
Answer-B

13) The correct colours for oxygen and acetylene hoses are
A.Black for oxygen and red for acetylene
B.Black for oxygen and maroon for acetylene
 C.Red for oxygen and blue for acetylene
D.Red for oxygen and maroon for acetylene
Answer-B

14) In an acetylene cylinder, the acetylene is dissolved in
A.Mercury
B.Carbon dioxide
C.Water
D.Acetone
Answer-D

15) The function of the central hole in the tip of the cutting blowpipe is
A.Supply acetylene for preheating
B.Supply oxygen for preheating
C.Supply oxygen for cutting
 D.Supply acetylene for cutting
Answer-C


16) Cast iron contains two elements, which make it difficult to cut it by gas cutting.What are these elements
A.Silicon and graphite
B.Graphite and phosphorous
C.Sulphur and phosphorous
D.Silicon and sulphur
Answer-A

17) Which fuel gas is used for cutting deep under water
A.Methane
B.Acetylene
C.Hydrogen
D.LPG
Answer-C

18) If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be
A.L mm
 B.L+2mm
C.L+4mm
 D.L+6mm
Answer-B

19) The correct flame for preheating before cutting is
A.oxidizing flame
 B.neutral flame
 C.carburising flame
 D.slightly carburizing flame
Answer-B

20) While gas cutting the nozzle should
A.almost touch the work
 B.be 10 mm away from work
C.be 2 mm away from work
 D.be 5 mm away from work
Answer-D

Utilization of Electrical Energy MCQ PART- 2

1) If the blowpipe is moved to and fro frequently while cutting the kerf will
1. not be affected
2. be less
3. of correct size
4. be more
Answer-D

2) In gas cutting, if too little cutting oxygen is supplied
1. the metal will be cooled down
2. the kerf will be narrow
3. the kert will be wide
4. the metal will fail to cut completely
Answer-D

3) The top edge is melted round and the cutface is not smooth in gas cutting. This is due to
1. extremely slow cutting speed
2. insufficient acetylene pressure
3. the tip being held too high
4. too much cutting oxygen pressure
Answer-C

4) In a gas cut plate, the cut shows groove sand has deep drag lines. This is due to
1. tip too close to the cut surface
2. too much travel speed
3. less oxygen pressure
4. smaller size cutting nozzle
Answer-A

5) In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines.This is due to
1. too slow cutting speed
2. smaller size cutting nozzle
3. impure cutting oxygen
4. less preheating flame
Answer-A


6) The size of the cutting nozzle used in oxyacetylene cutting process depends mainly on
1. thickness of metal to be cut
2. purity of oxygen
3. duration of cut
4. type of cutting blowpipe
Answer-A

7) Which of the following types is not fillet weld
1. T-joint
2. Corner joint
3. lap joint
4. butt joint
Answer-D

8) Double-V and double-U butt welds are used for plates of thickness
1. 1 - 5 mm
2. 5 - 10 mm
3. 10 - 15 mm
4. above 15 mm
Answer-D

9) Which material is not used for making non-consumable electrodes
1. Carbon
2. Tungsten
3. Graphite
4. Sodium
Answer-D

10) Which of the following is an example of plastic welding
1. Gas welding
2. Arc welding
3. Thermit welding
4. Forge welding
Answer-D


11) Which of the following is not a type of arc welding
1. Submerged
2. Plasma
3. Air-acetylene
4. Electro-slag
Answer-C

12) Which of the following is an example of fusion welding
1. Arc welding
2. Resistance welding
3. Thermit welding with pressure
4. Forge welding
Answer-A

13) Which of the following welding process is used for welding of sheet metals in automobile and air craft industries
1. Resistance welding
2. Thermit welding
3. Gas tungsten arc welding
4. Shield metal arc welding
Answer-A

14) In which of the following process, heat is created by blacksmith fire
1. Seam welding
2. Spot welding
3. Projection welding
4. Forge welding
Answer-D

15) Heat is created by chemical reaction in
1. Tungsten arc welding
2. Thermit welding
3. Oxy-acetylene welding
4. Resistance welding
Answer-B


16) In resistance welding, two electrodes are made of
1. Copper
2. Iron
3. Bronze
4. Aluminium
Answer-A

17) Acetylene can be prepared by the chemical reaction between
1. Hydrogen and Calcium carbide
2. Water and Calcium carbonate
3. Water and Calcium carbide
4. Hydrogen and Calcium carbonate
Answer-C

18) Which flame is suitable for cutting operations
1. Oxidising flame
2. Carburising flame
3. Neutral flame
4. None of these
Answer-A

19) Which flame is suitable for welding steel
1. Oxidising flame
2. Carburising flame
3. Neutral flame
4. None of these
Answer-B

20) Which of the following is not true for gas welding
1. There are safety problems in storing and handling the gases
2. Heat effected zone and distortion are less as compare to arc welding
3. It is slower than arc welding
4. It is suitable for thin sheets
Answer-B

                                 PKR ELECTRICAL ENGINEERING
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