PKR ELECTRICAL ENGINEERING: OBJECTIVE –QUESTIONS ON TRD (PART

Friday, January 6, 2023

OBJECTIVE –QUESTIONS ON TRD (PART - 3 )

OBJECTIVE –QUESTIONS ON TRD (PART - 3 )

101.A mast towards the center of the curve with respect to curved track is called as inside curve mast. (True/False)

102.A mast away from the center of the curve with respect to curve track is called as outside curve mast.(True/False)

103.Selection of span length on curvatures depends upon stagger.(True/False)

104.The term Curve Allowance is related with-

a) Mast Length b) Encumbrance

c) Stagger d) Implantation.

105. The Curve Allowance is to be subtracted from the standard values of implantation on tangent track. (True/False)

106. The value of implantation on curved tracks varies according to the sharpness of the curve. (True/False)

107. What is the maximum span length for Tramway type regulated OHE?

108. What is the maximum span length for Tramway type un- regulated OHE?

109. 8.5mts long masts should be used for tram-way type OHE. ( True/False)

110. Cap to Cap surface distance of ST, BT & 9 Ton insulators is called as --------------distance.

111. What shall be the difference in insulators being used in ordinary and polluted zones?

a) No difference b) load bearing capacity

c) design d) Creepage distance.

112. Insulators with high creepage distance are used in heavily polluted zones.(True/False)

113. Long Creepage distance is –

a) 2000mm b) 1000mm c) 1050mm d) 760mm

114. Name the material used for making of OHE insulators ?

115. If ------- sheds of Insulator is found broken, it should be immediately replaced.

116. Is any test done on 9 ton insulator before its usage? (Yes/No)

117.Name the test that is done on ST, BT & 9Ton insulators prior to their use.

a) Load test b) IR test

c) PI test d) No test

118. What specialty is required to the insulators to be used in polluted zone?

119. Sheds of the Hybrid Insulator is made-up of.-------------------------------------

120. 9 Ton insulator is tested on ---------------------- kg load.

121. Testing load of ST and BT insulators is ------------------kg.

122. Identify that is not a type of insulator from the given below.

a) Bracket insulator

b) Stay Insulator

c) 9 Ton insulator

d) Pedestal Insulator

e) Tie Rod insulator f) PTFE

g) Non of these.

123. Identify the activity that is done during AOH-

a) Clean the insulator

b) identify the defective and replace it

c) Note the make and batch of insulator

d) all of the above.

124. What probable defects you would suspect to a given insulator?

1) Dirty surface 2) broken sheds 3) Crack 4) Prohibited make & batch 5) Flash

6) loose GI cap.

a) 1,3,5

b) 2,4,6

c) 1,2,3,5,6

d) all of these.

125. For ------------------------------------rubber gloves are necessary.

126. What would be the No. of Elementary Section that is controlled by SS/216 –

a) It may be any thing

b) 21600

c) X-216

d) SS-216

127.Clearance between fix and moving contacts when the Isolator is open?

128.Isolator is OFF load switch. (True/False)

129.Keys of all isolators of a Station are kept in Key Box under custody of the Station Master. (True/False)

130.The number of Main line Isolators prefix the code ---------------.

131.The number of Yard line Isolators prefix the code ---------------.

132.For Isolator operation Competency Certificate is necessary. (True/False)

133.What do you mean by term OFF Load Switch in reference to Isolator?

a) Isolator in yard.

b) Maintenance of the Isolator can be done.

c) No current through the isolator

d) Operation can be done with least effort.

134. What is the purpose of Isolator Arcing Horns?

a) As Bird scar to prevent the contacts from dirt.

b) High Voltage Protection.

c)To protect main contacts from sparking while isolator operation.

d)To lock the main contacts while isolator is in closed condition.

135. In reference to Isolator what the term Pole generally means?

a) No. of Phase b) No. of pedestal insulator

c) Clearance between fix and moving contacts. d) Non of the above.

136.Generally Isolators of -------- Amp capacity for OHE and --------- Amp capacity for switching stations are used.

137.In course of maintenance of Isolator switch its fix and moving contacts should be shorted by a flexible jumper. (True/False)

138.What do you mean by earthing heel isolators?

a)Isolator mast is connected with an earth electrode.

b)Isolator Handel is shorted with mast by a flexible jumper.

c)the isolator has two moving contacts.

d)The Isolator isolates as well as earth the isolated OHE.

139.An Isolator mast shall only be connected to earth electrode if duplicate bonding to the mast is not provided.(True/false)

140.SS rope is treated with ---------------------------- oil.

141.-------- mts SS rope is suitable for Winch type ATD.

142.-------- mts SS rope is suitable for 3 pulley ATD.

143.What would be the suitable length of SS rope in Winch type ATD used for Tram- Way OHE?

144.What would be the suitable length of SS rope in 3 pulley ATD used for Tram-Way OHE?

145.How much counter wait shall be required for Winch type ATD used in Tram-way OHE?

146.How much counter wait shall be required for 3 Pulley ATD used in Tram-way OHE?

147.What is the mechanical advantage of Winch type ATD?

148.Z value of Winch type ATD at 35ºC ?

149.X value increases and Y value decreases with increase in temperature.(True/False)

150.What is the mechanical advantage of three pulley type ATD?

ANSWER

101.True 102.True 103.True 104.d

105.False 106.True 107.63 mts 108.30 mts.

109.True 110. Creepage 111.d 112.True

113.c 114.Porcelain 115.3 116.Yes

117.a 118.Long Creepage distance. 119.Special Rubber. 120.6930

121. 4900 122.g 123.d 124.d

125.Isolator operation / DO fuse operation 126.c 127.500 mm 128.True

129.True 130.SM 131.SS 132.True

133.c 134.c 135.a 136.800 , 1250

137.True 138.d 139.False 140. Balmerol-100

141.10.5 mts 142.8.5 mts 143.10.5 mts 144.8.5 mts

145.250 kg 146.415 kg 147.1:5 148.1.25 mts

149.False. 150.1:3

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