1) Which systems are present in the excitation systems of a larger synchronous generator?
a. Rectification only
b. Cooling system only
c. Control functions only
d. All of these
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2) Which factor is controlled by turbine and governor?
a. Voltage
b. Frequency
c. Power factor
d. All of these
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3) What is the application of synchronous motor of speed less than 750 rpm?
a. Fans
b. Pumps
c. Ball mills
d. Compressors
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4) Where is the synchronous motor drive with cycloconverters used?
a. Compressors
b. Ball mills in cement plants
c. Fans
d. All of these
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5) On what factor does the starting current of the induction motor depend?
a. Starting torque required
b. Losses allowed during starting
c. Both (A) and (B)
d. None of these
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6) Which among these devices are required for manual control of induction motors?
a. Drum controller
b. Face plate starter
c. Toggle switch
d. Only b and c
e. All of these
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7) Which among these devices are used to protect low voltage induction motor?
a. Thermal overload relay
b. HRC fuse
c. Contactor starter
d. All of these
e. None of these
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8) Upto what motor ratings, the HRC fuse can be used as a protective device?
a. 500 V
b. 1000 V
c. 1500 V
d. 5000 V
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9) How many sets of orthogonal accelerometer are fixed on each bearing for performing vibration tests on induction motors?
a. Five
b. Four
c. Three
d. Two
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10) Above what ratings is it necessary to fix separate heat exchangers on the machines?
a. Above 500 kW
b. Above 300 kW
c. Above 100 kW
d. Above 1000 kW
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11) What is the permitted noise level in db for a 500 kW motor running at a speed of 1500 rpm?
a. 60 db
b. 75 db
c. 90 db
d. 55 db
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12) Which among these is a commissioning check during site testing for an induction motor?
a. Insulation resistance
b. Terminal shrouds
c. Heater supply
d. All of these
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13) Which among these is an application of single phase synchronous AC motor?
a. Small drill
b. Large drill
c. Dishwasher
d. Sewing machine
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14) What is the speed range of poly phase Commutator motors?
a. 0.5 Ns to 1 Ns
b. 0.5 Ns to 1.5 Ns
c. 0.1 Ns to 2 Ns
d. 0.5 Ns to 2.5 Ns
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15) At what percentage of the rated speed is the starting winding of a capacitor start induction disconnected with the help of a centrifugal switch?
a. 50 % of the rated speed
b. 70 % of the rated speed
c. 25 % of the rated speed
d. 5 % of the rated speed
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16) What is the value of the permanently connected capacitor in capacitor start capacitor run induction motor?
a. 40 μ F
b. 5 μ F
c. 300 μ F
d. 1000 μ F
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17) On what factor does the commutation depend?
a. Brush grade
b. Condition of Commutator surface
c. Position of interpoles and magnetic flux
d. All of these
e. None of these
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18) Which among these is common defect in a Commutator?
a. Over Mica
b. High Copper bar
c. Sharp edges of copper bars
d. Only a and b
e. All of these
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19) At what temperature is the drying out procedure carried out in a DC motor?
a. 50 ° C
b. 100 ° C
c. 150 ° C
d. 200 ° C
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20) What is the voltage characteristic of a differential compound DC motor?
a. Rising
b. Drooping
c. Flat
d. Exponential
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21) Which among these materials have a relative permeability of 1?
i. Air
ii. Copper
iii. Iron
iv. Nickel
a. i and ii only
b. i and iii only
c. i and iv only
d. iii and iv only
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22) Which material has a lower dielectric strength at 50 Hz?
a. Bakelite
b. Glass
c. Air
d. Dielectric oil
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23) Which among these is a method to minimise eddy current loss?
a. Laminated core
b. Insulation of lamination
c. Use of material of high electrical resistivity
d. Only a and c
e. All of these
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24) Which among these materials is a permanent magnetic material?
a. Palladium
b. Chromium steel
c. Silicon steel
d. All of these
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25) What is the first equipment placed in the uninterrupted power supply (UPS)?
a. Inverter
b. Battery
c. Rectifier
d. Any of these
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26) Which device is connected in series?
a. RC surge suppressors
b. Smoothing reactors
c. Metal oxide veristors
d. Static balancer
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27) What test is performed to verify that the equipment is ready for energising?
a. Maintenance test
b. Commissioning test
c. Type test
d. Reliability test
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28) What is the preferred value of DC test voltage for site?
a. 104 % of the routine factory AC test voltage
b. 65 % of the routine factory AC test voltage
c. 1.6 % of the routine factory AC test voltage
d. 75 % of the routine factory AC test voltage
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29) What type of insulation is preferred for DC smoothing Reactors?
a. Air
b. Oil
c. Paper
d. Varnish
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30) Which place is the ‘Regional load dispatch centre’ for the western region in the national grid?
a. Mumbai
b. Ahmadabad
c. Bhopal
d. Nagpur
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31) At what level is the load shedding carried out?
a. Distribution level
b. Transmission level
c. Both (A) and (B)
d. Depending upon the load
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32) Which among these is a part of HVDC link?
a. Two earth electrodes
b. Converter valves
c. Bipolar DC line
d. All of these
e. None of these
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33) Corona rings are fixed on which among these?
a. At cross arm end of the string assembly
b. At corners of bus bar joints
c. Only at contacts of isolators
d. Only b and c
e. All of these
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34) Which type of foundation is preferred for lattice towers?
a. Rock foundation
b. Pole foundation
c. Anchor foundation
d. All of these
e. None of these
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35) What is the minimum life span of a galvanised steel structure?
a. 15 years
b. 25 years
c. 40 years
d. 80 years
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36) Arrange these in the correct order of the sequence for designing the tower?
i. Design data
ii. Prototype manufacture
iii. Providing tests
iv. Preliminary design
v. Final design
vi. Earlier experience
a. vi – i – iv – v – ii – iii
b. vi – i – iv – ii – iii – v
c. i – vi – iv – v – ii – iii
d. i – iv – iv – ii – iii – v
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37) Which material is used for indoor bus bar?
a. Copper
b. Aluminium
c. Silver
d. Both (A) and (B)
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38) Which among these types of bus bars can be used outdoor?
a. Tubular
b. ACSR
c. AAC
d. All of these
e. None of these
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39) Which among these is a type of surge arrestor?
a. Conventional gapped arrestors
b. Metal oxide arrestors
c. Both (A) and (B)
d. None of these
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40) Which among these is a configuration of an isolator?
i. Vertical break type
ii. Horizontal type
iii. Horizontal break with two post insulator
iv. Horizontal break centre post rotating double break
v. Pantograph type
a. Only ii and iii
b. i, ii, iii, and iv
c. i, ii, iii, iv, v
d. i, ii, iv, v
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