#LMRC PREVIOUS YEAR QUESTION PAPER AND ANSWERS
1. The unit of electro-chemical equivalent (ECE) is
A. km/C
B. g/C
C. cm/C
D. ml/C
Ans- B
2. A machine which converts mechanical energy into electrical energy is known as ______.
A. a transducer
B. a converter
C. a motor
D. a generator
Ans - D
3. What is the resistance of a lamp if 10 V battery reasult in 200 mA current flowing through it ?
A. 50
B. 25
C. 48
D. 45
Ans - A
4. What is the energy level between the conduction band and the valence band in a semiconductor?
A. 1 eV
B. 0.07 eV
C. 2.5 eV
D. Zero
Ans - A
5. Which types of cable is best for electric iron, heater and soldering?
A. Polyvinyl chloride (PVC) cable
B. Vulcanized insulation rubber (VIR)
D. Cab tyre sheathed (CTS) cable
Ans - B
6. In an AC system the order of phase connection will be:
A. blue, red and yellow
B. red, blue and yellow
C. red, yellow and blue
D. yellow, red and blue
Ans - C
7. AC circuit breakers are ______ than DC circuit breakers.
A. cheaper
B. lesser in size
C. no cost
D. costlier
Ans - A
8. The value of peak factor (Ka) for a sinusoidal A.C. is:
A. 0.722
B. 1.414
C. 1.441
D. 0.723
Ans - B
9. The shaft torque of a DC motor is less than its armature torque because of ______ losses.
A. mechanical
B. iron
C. copper
D. rotational
Ans - D
10. AC transmission systems are ______ efficient than the DC transmission systems.
A. doubly
B. less
C. half
D. more
Ans - B
11. Identify the gate symbol in the given figure.
B. NOR gate
C. AND gate
D. OR gate
Ans - B
12. When a motor is switched on, the counter EMF developed across the armature terminals is:
A. half
B. one
C. zero
D. twice
Ans - C
13. Which of the following states the disadvantage of a UJT?
A. Requires low value of triggering current
B. Negative resistance characteristics
C. Inability to provide appropriate amplification
D. Low power absorbing device
Ans - C
14. What is the name of the left hand most bit in any binary number?
B. Least significant bit
C. Higher bit
D. Right hand most bit
Ans - A
15. In which line have power supply voltage higher than to other?
A. Transmission line
B. Distribution line
C. Generation station line
D. Consumer line
Ans - A
16. Frequency is the reciprocal of the ______ of the alternating quantity.
A. Amplitude
B. phase difference
C. phase angle
D. time period
Ans - D
17. Which parameter of a wire should be increased so that the voltage drop will decrease?
A. Wire material resistivity
B. Wire length
C. Wire resistance
D. Wire cross-section area
Ans - D
18. In an N-type semiconductor, doping impurity is known as:
A. acceptor
B. holes
C. vacancy of electrons
D. donor
Ans - D
19 A semiconductor has ______ band.
A. very high energy
B. an almost empty conduction
C. an almost full conduction
D. an almost empty valence
Ans- B
20. When a motor runs at rated armature voltage and rated field current, it is defined as:
A. speed range
B. flux speed
C. base speed of motor
D. speed regulation
Ans - C
21. In insulation, which of the following breakdown form?
A. Electrical breakdown
B. Thermal and electrical breakdown
C. Frequency breakdown
D. Thermal breakdown
Ans - B
22. In A. C. Supply, the number of cycles per second is called ______.
A. phase angle
B. phase difference
C. Frequency
D. Amplitude
Ans - C
23. A delta connected balance 3 phase load is supplied from 3 phase , 400 v supply. The line current is 20 A and power taken by the load is 10000 W . Find the impedance of each phase branch ?
A. 34.64 ohm
B. 44.64 ohm
C. 24.64 ohm
D. 66.64 ohm
Ans- A
24. True state is represented in binary number system?
A. Logic 1
B. 011
C. Low state
D. Logic 0
Ans- A
25. Which of the following is NOT an earthing method?
A. Rod earthing
B. Pipe earthing
C. Earthing through a rope
D. Plate earthing
Ans - C
26. Wattmeter may be classified as:
A. an indicating instrument
B. a primary instrument
C. an integrating instrument
D. a controlling instrument
Ans- A
27. Henry is the unit of electric:
A. Capacitance
B. Conductance
C. Inductance
D. Resistance
Ans - C
28. The height of the switch board from ground level should be:
A. 1.5 metres
B. 2.5 metres
C. 3.5 metres
D. 0.5 metres
Ans - A
29. Back EMF acts like:
A. a controller
B. a source
C. a governor
D. a torque
Ans - C
30. Elements of which group is used as doping for a P-type semiconductor?
A. Group III
B. Group II
C. Group V
D. Group IV
Ans - A
31. Which type of renewable energy plant gives minimum average capital cost?
A. Hydroelectric
B. Onshore wind
C. Solar PV system
D. Geothermal
Ans - B
32. Identify the logic gate for the given truth table .
A. NOR gates
B. AND gates
C. OR gates
D. NAND gates
Ans - D
33. Which of the following DC motor is more suitable for crane to develop high torque?
A. Shunt motor
B. Differential compound motor
C. Cumulative compound motor
D. Series motor
Ans - D
34. Polarization index (PI) is given by :
A. PI = 10 minutes reading / 5 minute reading
B. PI = 10 minutes reading / 1 minute reading
C. PI = 100 minutes reading / 1 minute reading
D. PI = 10 minutes reading / 100 minute reading
Ans - B
35. Which of the following defines the advantage of AC transmission line as compared with DC
transmission line?
A. DC system has no inductance in line
B. DC system is more efficient than AC system
C. No skin effect in DC transmission lines
D. DC transmission system is more complex and costly
Ans - D
36. Which of the following rules pertain to general safety requirements under the Indian Electricity Rules, 1956?
A. Rules 29 to 66
B. Rules 29 to 36
C. Rules 29 to 46
D. Rules 29 to 56
Ans - C
37. kWh meter may be classified as:
A. an indicating instrument
B. a recording instrument
C. an integrating instrument
D. a deflecting instrument
Ans - C
38. The main contents of insulating oil is/are:
A. naptha, aromatic and paraffin
B. oil oxidation, aromatic and naptha
C. paraffin, kerosene
D. naptha
Ans- A
39. Knowledge of peak factor is important in testing:
A. current
B. Frequency
C. Voltage
Ans - D
40. In Transformer, secondary winding emf induced due to ______.
A. an increasing magnetic flux
B. an alternating magnetic flux
C. an alternating electrical flux
D. a constant magnetic flux
Ans - B
41. The reciprocal of resistance is called:
A. permittivity
B. resistivity
C. reactance
D. conductance
Ans - D
42. What happens when an electron jumps from a lower orbit to a higher orbit?
A. Light is absorbed
B. Energy can change
C. Light is emitted
D. Heat is radiated
Ans - A
43. Value of insulation resistance is defined in ______.
A. mega–ohms
B. kilo-ohms
C. milli-ohms
D. Ohms
Ans- A
44. Find the value of form factor if Im =10 A
A. 2.50
B. 2.58
C. 1.57
D. 1.50
Ans - C
45. A three-phase induction motor rotor rotates at ______.
A. more than synchronous speed
B. synchronous speed
C. less than synchronous speed
D. half of synchronous speed
Ans - C
46. In N-type semiconductors, the majority carriers move from:
A. higher to lower potential
B. lower to lower potential
C. lower to higher potential
D. higher to higher potential
Ans - C
47. 
Ans - D
48. Identify the type of power amplifier class , in the given circuit diagram.
B. Class B amplifier
C. Class AB amplifier
D. Class A amplifier
Ans- B
49. Reciprocal of power factor is called:
A. form factor
B. peak factor
C. Q-factor
D. crest factor
Ans - C
50. Which of the following types of energy sources is considered as a conventional source of energy?
A. Geothermal energy
B. Wind energy
C. Coal energy
D. Solar energy
Ans - C
51. Find the value of the electro-chemical equivalent of chromium, if 2.16 gm of chromium is liberated by the passage of a current of 5 A for 1 hour and 20 minutes.
A. 5 × 10 – 5 gm/C
B. 7 × 10 – 5 gm/C
C. 9 × 10 – 5 gm/C
D. 10 × 10 – 5 gm/C
Ans - C
52. The torque which is available for doing useful work known as:
A. shaft torque
B. brake torque
C. balance torque
D. load torque
Ans - A
53. Which type of energy is transform in electric power by using dam that studied near the ocean?
A. Nuclear energy
B. Wave energy
C. Geothermal energy
D. Ocean thermal energy
Ans - B
54. Which of the following can be increased when temperature is added to silicon?
A. Wavelength
B. Gap of energy level
C. Conductivity
D. Resistivity
Ans - C
55. According to Indian Standards, a distribution transformer is ______.
A. 220/133kV
B. 220/11kV
C. 11/0.4 kV
D. 400 V/11kV
Ans - C
56. Which formula correctly defines the insulation resistance of a wire?
A. Supply current/Receiving voltage in volts
B. Supply current/Receiving current
C. Supply voltage in volts / Leakage current
D. Supply voltage in volts / Receiving voltage in volts
Ans - C
57. Torque and armature current characteristics of a DC machine are known as:
A. mechanical characteristics
B. electrical characteristics
C. speed characteristics
D. load characteristics
Ans - B
58. Which type of parameter is used to drive a JFET?
A. Current
B. Voltage
C. Both current and voltage
D. Low voltage and high current
Ans - B
59. Which type of fuel is produced by water and is considered as renewable energy?
A. Petroleum
B. Hydrocarbon gas liquid
C. Natural gas
D. Hydrogen
Ans - D
60. The winding on a machine that carries only load current is called ______.
A. auxiliary winding
B. armature winding
C. tertiary winding
D. field winding
Ans - B
61. Which type of parameter is found in AC transmission line but NOT found in DC transmission
line?
A. Wire resistance
B. High voltage level
C. Corona losses in line
D. Surges
Ans - D
62. Which class of power amplifier has the highest efficiency?
A. Class AB amplifier
B. Class B amplifier
C. Class C amplifier
D. Class A amplifier
Ans - C
63. For emergency, which of the following boxes should be provided at all stations?
A. Complaint box
C. Letter box
D. Suggestion box
Ans - B
64. What is the voltage drop in a wire, if a circuit box supply the voltage 120V to the socket pin received the voltage 115V, which is 37 ft far from the circuit box?
A. 115 V
B. 5 V
C. 1.04 V
D. 120 V
Ans - B
65. Which of the following is a renewable energy source?
A. Natural gas
B. Nuclear energy
C. Hydrocarbon gas liquid
D. Tidal energy
Ans - D
66. Which of the following impurities is used to form a P-type semiconductor?
A. Gallium
B. Bismuth
C. Antimony
D. Phosphorus
Ans - A
67. If load is ______ the current and voltage are in same phase in A.C. supply.
A. pure ohmic resistance
B. pure inductance
C. reactive
D. pure capacitance
Ans - A
68. Find the value of X whose base is 10 . (1100) binary = (X) decimal
A. 18
B. 12
C. 21
D. 10
Ans - B
69. What is the value of the conduction angle in class A type of amplifier?
A. Full cycle
B. Slightly less than half cycle
C. Slightly more than half cycle
D. Half cycle
Ans - A
70. Which point is NOT to be taken into account for determining the size of conductor?
A. Voltage drop
B. Current carrying capacity
C. Minimum size of the conductor for mechanical reasons
D. Quality of insulator
Ans - D
71. Identify the given in figure
A. UJT
B. FET
C. Fabricated IC
D. JFET
Ans - A
72. In a DC machine speed is:
A. inversely proportional to back EMF and directly proportional to the flux.
B. directly proportional to back EMF and inversely proportional to the flux.
C. directly proportional to back EMF.
D. inversely proportional to the flux.
Ans - B
73. The ratio of RMS value/average is defined as:
A. amplitude factor
B. crest factor
C. form factor
D. power factor
Ans - C
74. On which of the following factors does earth resistance value NOT depend?
A. Moisture control of soil
B. Temperature of soil
C. Colour of soil
D. Condition of soil
Ans - C
75. The direction of induced EMF in an armature conductor can be determined with the help of:
C. Lenz's law
D. Fleming's left hand rule
Ans - A
For practice quiz part 1 25 question link 👉 https://quizzory.in/id/62d1ad228eaf5031eb5bd8d3