1. Which of the following materials will witness a decrease in resistance when its temperature decreases?
1. Mica
2. Aluminum
3. Paper
4. Rubber
Ans - 2
2. The operating temperature of a gas-filled tungsten filament lamp is about ______.
1. 2700⁰ C
2. 2000⁰ C
3. 1500⁰ C
4. 2200⁰ C
Ans - 1
3. The application of stepper motor is______.
1. Hair dryer
2. Mixture & grinder
3. Exhaust fan motor
4. Printers & fax machine
Ans - 4
4. Which of the following is NOT an effect of single phasing in a three-phase induction motor?
1. Motor will continue run from running position
2. Motor current is increasing 2.5 times to average current
3. Motor cannot be increasing the heating
4. Motor cannot be started from stop position
Ans - 1
5. When metal body of equipment is earthed, it protects the equipment from?
1. Over current
3. Under current
4. Breakdown voltage
Ans - 2
6. As a thumb rule for 415 V, 3-phase squirrel cage induction motors, full load current can be taken as ______.
1. 1.5 times to HP rating
2. Equal to HP rating
3. 2.0 times to HP rating
4. 2.5 times to HP rating
Ans - 1
7. The opposing property of a magnetic circuit for the flow of magnetic flux lines is defined by the following:
1. Defined by the magnetic strength
2. Equal to the ratio of the magneto motive force to the magnetic flux.
3. Equal to the ratio of the magneto motive force to the magnetic permeability.
4. Permeability of the magnets
Ans - 2
8. Which type of power electronic converter is used to control the speed of DC motor from a fixed DC source?
1. Half controlled rectifier
2. AC voltage regulator
3. Full controlled rectifier
4. Chopper
Ans - 4
9. The thickness of copper plate used as an earth electrode is:
1. 3.0 mm
2. 3.15 mm
3. 3.5 mm
4. 3.75 mm
Ans - 2
10. Emf induced in the secondary of the transformer is directly proportional to which of the quantity?
1. Number of turns in the primary winding
2. Secondary load
3. Flux density in the core area
4. Period of the frequency
Ans - 3
11. Which is an example of a secondary type of instruments?
1. Absolute electrometer
2. Raleigh current balance
3. Wattmeter
4. Tangent galvanometer
Ans - 3
12. Which type of material is NOT used to create earthing rods?
1. Copper bonded to steel
2. Carbon bonded polymer
3. Galvanized iron
4. Stainless steel
Ans - 2
13. Which is an advantage of batten wiring?
1. Can’t be installed in the humidity, Chemical effects, open and outdoor areas
2. Suitable for voltages below 250 V
3. Less chance of leakage current
4. High risk of fire
Ans - 3
14. Energy generated by using wind, tides, solar, geothermal heat and biomass including farm & animal waste is called ______.
1. Super-Conventional energy
2. Non-Conventional energy
3. Over-Conventional energy
4. Conventional energy
Ans - 2
15. Which method can be used for reducing the earth resistance?
1. Use multiple rods
2. Dry the soil by heat
3. Decrease the diameter of rod
4. Increase the length of the rod
Ans - 1
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16. The transformer has single winding is known as______.
1. Potential transformer
2. Current transformer
3. Power transformer
4. Auto transformer
Ans - 4
17. Identify the wiring type system given in figure ?
1. Conduit wiring
2. Capping wiring
3. Cleat Wiring
4. CTS wiring
Ans - 3
18. Which wiring is mainly used for entertainment or relaxation purpose?
1. Home theater wiring
2. Go down wiring
3. Hostel wiring
4. Bedroom wiring
Ans - 1
19. When the length of an over-head transmission line is about 50-150 km and the line voltage is moderately high 20 kV-100 kV, then, it is called?
1. long transmission line
2. Medium transmission line
3. Short transmission line
4. High transmission line
Ans -2
20. Which motor among the options given, is capable of producing high starting torque?
1. Single phase motor shaded pole
2. Permanent DC motor
3. Repulsion motor
4. squirrel cage induction motor
Ans - 3
21. As per BIS rules all incandescent lamp shall be provided at a height of ______.
1. 2.5 meter
2. 2.0 meter
3. 3.5 meter
4. 1.5 meter
Ans - 1
22. What is the value of Peak factor of a sin wave if the maximum Voltage is 23√2 V?
1. 3.14
2. 25
3. 23✓2
4. 1.414
Ans -4
23. The process of equalizing the stress in the dielectric of the cable is known as:
1. Insulation level of cable
2. Grading of Cable
3. Space material of the cable
4. Distance of the cables
Ans-2
24. What effect on speed when poles are double of an Induction motor?
1. Speed will one fourth
2. Speed will halved
3. Speed will not change
4. Speed will double
Ans-2
25. What is the span value of an alternation of the sine wave?
1. one third cycle part of sine wave or 230⁰
2. One fourth cycle of sine wave or 90⁰
3. Full cycle of sine wave or 360⁰
4. Half cycle of sine wave or 180⁰
Ans-4
26. Which type of magnetization method is used when stronger magnetic field is required or for multi-polar magnetization?
1. Conservative magnetization method
2. Plus magnetic field
3. Static electromagnetic field
4. Static magnetization method
Ans-2
27. Effect of corona can be minimized by which of the following way?
1. To avoid under load
2. Solid conductor
3. By using a copper conductor
4. By maintaining a proper gap between conductors and ACSR conductor
Ans-4
28. Which among the options, is the advantage of plastic film type capacitor?
1. Higher tolerances
2. Low reliability
3. Small service life
4. Operation at high temperature
Ans-4
29. Which type of winding design in core type of transformer is shown in the figure ?
1. Crossover Winding
2. Disc-Helical Windings
3. Helical Windings
4. Cylindrical Windings
Ans-4
30. In hysteresis loop (B-H Curve) B represents of the:
1. Magnetic flux density
2. Maximum flux
3. Magnetizing force
4. Reluctance
Ans-1
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31.What is the efficiency of an alternator if the output is 25 kW and the losses are 2 kW?
1. 80 Percent
2. 65.75 Percent
3. 75.68 Percent
4. 92.60 Percent
Ans-4
32. Synchronous motors are employed exclusively as power factor correction devices, they are termed as ______.
1. Synchronous transformer
3. Synchronous motor
4. Synchronous alternator
Ans-2
33. Unit of specific resistance is:
1.mega ohm×meter
2.kilo ohm×meter
3.ohm×meter
4.mili ohm×meter
Ans-3
34. Power in three phase pure resistive load is ______.
1. P= VL×IL×cos ¢
2. P= 1/3 ×VL×IL
3. P= 3 VL×IL×cos¢
4. P= ✓3VL×IL
Ans-4
35. Which is the application of low voltage lamps?
1. Industrial light
2. Domestic light
3. Food light
4. Automobile light
Ans-4
36. Which is the simplest and cheapest filter circuit in electronics?
1. Capacitor input filter
2. Series inductor filter
3. Choke input LC filter
4. RC filter
Ans-1
37. V.I.R. stand for:
1. Venial Industrial rubber
2. Venial Indian rubber
3. Vulcanized Indian rubber
4. Vulcanized Industrial rubber
Ans-3
38. Which type of materials are used in Photo-Voltic cells?
1. Semi-conductors
2. Silver conductor
3. Lead and tin conductor
4. Carbon conductor
Ans-1
39.The process of elimination of errors by configuring an energy meter to provide a result within an acceptable range, is known as :
1. Requirements of energy meter
2. Calibration of energy meter
3. Checking of energy meter
4. Specialization of energy meter
Ans-2
40. Bakelite is a ______.
1. Super Conductor
2. Conductor
3. Insulator
4. Semi- conductor
Ans-3
41. Identify the machine whose parts are armature core, Shaft, yoke and commutator?
1. Squirrel-cage induction generator
2. slip ring Induction generator
3. DC generator
4. synchronous generator
Ans-3
42. What is the Speed of Electricity?
1. 286000 miles/ sec
2. 386000 miles/ sec
3. 486000 miles/ sec
4. 186000 miles/ sec
Ans-4
43. Ferromagnetic substances are:
1. Bismuth, Sulphur, nickel
2. Iron, Aluminum, copper
3. Graphite, Nickel, paper
4. Iron, nickel, cobalt
Ans-4
44. Which part facilitates the transfer of mechanical power from or to the DC machine?
1. Shaft
2. Cooling fans
3. Commutator
4. Armature core
Ans-1
45. Which is the correct statement that defines hysteresis motor?
1. It is a motor that has produced the torque by direct flux.
2. It is a motor whose losses are minimum and that works on high temperature.
3. It is a synchronous motor with a uniform air gap and with DC excitation.
4. It is a synchronous motor with a uniform air gap and without DC excitation.
Ans-4
46. Which type of load has nature to produce a leading power factor?
1. Inductive
2. Resistive
3. Series connected resistance and inductance
4. Capacitive
Ans-4
47. Identify the following part which is used with the transformer?
1. Breather
2. Buchholze relay
3. Oil tank
4. Conservator
Ans-1
48. In pure resistive circuit, Power is equal to ______.
1. V×I watt
2. V/I watt
3. V×R watt
4. Zero
Ans-1
49. An electric lamp in which the light is obtained by a discharge of electricity between two electrodes in gas or vapor is called ______.
1. Arc lamp
2. Vacuum lamp
3. Halogen lamp
4. Discharge lamp
Ans-4
50. Which type of capacitor is shown in the figure?
1. Electrolytic Capacitor
2. Dielectric Capacitors
3. Ceramic Capacitors
4. Film Capacitor Type
Ans-1
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