Dmrc Maintainer Electrician Online Test : Every year lakhs of candidates prepare for the recruitment of DMRC Maintainer Electrician and appear for its examination but not every candidate is able to pass this examination because he is not able to prepare properly at the right time. So the candidate who is preparing for DMRC Maintainer Electrician recruitment, for that many tests have been given on our website, by solving which he can prepare himself. In today’s post also, some important questions asked in the DMRC Maintainer Electrician exam and their answers have been given in the form of 1 mock test, by solving which you can improve your preparation.
Dmrc Maintainer Electrician Online Test
1. Which type of wiring is suitable in multi-storey buildings?
• Tree System
• Ring Main System
• Distribution Board System
• Ring Main and Distribution Board System
Answer: Tree System
2. Which of the following does not change in a transformer?
• Current
• Voltage
• Frequency
• All of these
Answer: Frequency
3. A resistor and capacitor are connected in series across a 20 V AC source. The impedance of the circuit is 4.33 kΩ. What is the current flowing in the circuit?
• 9.2 mA
• 92 mA
• 4-6 mA
• 460 mA
Answer :4-6 mA
4. The frequency produced in India is ………..?
• F = 65 Hz
• F = 60 Hz
• F = 55 Hz
• F = 50 Hz
Answer :F = 50 Hz
5. 10&: The rotor input of a SCIM running with spill is 100 kW. Power developed by its rotor is ….. kW
• 10
• 90
• 99
• 80
Answer :90
6. Electrical energy in the fuel cell is produced by ………?
• Reaction of hydrogen with oxygen
• Thermionic action
• Combustion of fuel in the absence of oxygen
• Any of the above
Answer: Reaction of hydrogen with oxygen
7. The reverse force of a DC motor depends on …….?
• Conductor shape
• Field flux
• Commutator segments
• Brush materials
Answer: Field flux
8. The force acting between two magnetic poles –
• Is proportional to their distance
• Is inversely proportional to their distance
• Is proportional to the square of their distance
• Is inversely proportional to the square of their distance
Answer: Is inversely proportional to the square of their distance
9. The single cycle primary of a current transformer has cycle ratio 10 : 1. Which of the following is the primary current if the current measured in the secondary is 2 ampere?
• 1 ampere
• 5 ampere
• 10 ampere
• 20 ampere
Answer :20 ampere
10. D.C. The filter action in the power supply unit can be improved by?
• Increasing the capacitance value
• Decreasing the capacitance value
• Removing the capacitance from the circuit
• Using a capacitor of the following capacitance value
Answer: Increasing the capacitance value
11. Gases are released in………… process
• Charging of accumulator cell
• Charging of dry cell
• Discharge of accumulator cell
• Discharge of dry cell
Answer: Charging of accumulator cell
12. Rectifier is used for?
• To convert A.C. into D.C.
• To convert D.C. into A.C.
• To convert tubes into transistors
• To convert transistors into diodes
Answer: To convert A.C. into D.C.
13. You found that in case of short circuit, the main conductors (L & N) of a single phase circuit are thrown away from each other. What is the reason for this?
• High short circuit current increases the temperature of conductors due to which they moved away from each other
• Strong magnetic force due to high current pushed them away from each other
• Cables are flexible so high short circuit current pushes them away
• Higher current density due to high short circuit current pushes them away from each other
Answer : Strong magnetic force due to high circuit current pushed them away from each other
14. Which type of chisel is used to make rectangular holes in wood?
• Mortise chisel
• Paring chisel
• Fermor chisel
• Bevel Fermor chisel
Answer: Mortise chisel
15. The most suitable joint for expanding the earth conductor is ………?
• Britannia joint
• Married joint
• Western joint
• Scard joint
Answer: Scard joint
16. Which basic fluorescent powder is used in neon sign lamps to obtain blue colour?
• Cadmium silicate
• Calcium silicate
• Calcium tungstate
• Zinc silicate
Answer :Calcium tungstate
17. Shaded pole single phase induction motor can be used in ……….
• ‘Wet grinder’
• Food mixer
• Tape recorder
• Cooling fan of personal computer
Answer: Cooling fan of personal computer
18. What type of motor will you choose to run transport vehicles?
• DC series motor
• DC shunt motor
• Separate incandescent motor
• Inter-compound DC motor
Answer: DC series motor
19. Bridge rectifier uses/has-
• Two diodes
• Four diodes
• Central terminal transformer and two diodes
• Only half of the input voltage
Answer : Four diodes
20. Wastewater from geothermal power plants is…
• Discharged back into the earth
• Discharged into the sea
• Returned after cooling in cooling towers
• Stored in ponds
Answer: Discharged back into the earth
21. Secondary cell can produce large amount of power?
• Can be recharged for a short time
• Can be recharged for a long time • Can be recharged for a short time
• Can not be recharged for a short time
• Can not be recharged for a long time
Answer :Can be recharged for a short time
22. Which of the following is the purpose of using a hand groover in sheet metal work?
• Locking a grooved seam
• Unlocking a grooved seam
• Striking the sheet
• Holding the sheet in position
Answer :Locking a grooved seam
23. Which material is used in shunt and multiplier to extend the range of moving coil meters?
• Phosphor bronze
• Silver
• Manganese
• Nichrome
Answer: Manganese
24. Provides protection against fuse …… in a circuit.
• Open circuit
• Overload
• Narrow circuit and overload
• Open circuit and overload
Answer :Open circuit
25. Which of the following insulation is used in cables?
• Varnish • Cabric
• Rubber
• Paper
• All of these
Answer: All of these
26. Leakage current of small magnitude in the installation produces …….
• Frequent breakdown of ELCB
• Electrical shocks
• Fire hazards
• High energy bills
Answer :High energy bills
27. How many SPT and 2 way switches will be required for wiring a warehouse with 6 lamps?
• One SPT and 6 2 way
• Two SPT and 5 2 way
• One SPT and 5 2 way
• Two SPT and 6 2 way
Answer: One SPT and 5 2 way
28. What is the accuracy of try square?
• 0.002 mm per 10 mm length
• 0.001 mm per 10 mm length
• 0.010 mm per 10 mm length
• 0.020 mm per 10 mm length
Answer :0.002 mm per 10 mm length
29. D.C. generator works on the principle of…….?
• Faraday’s law of electrolysis
• Fleming’s left hand rule
• Lenz’s law
• Faraday’s law of electromagnetic induction
Answer :Faraday’s law of electromagnetic induction
30. Nickel-cadmium dry cells are becoming more popular in the power supply units of electronic calculators. Because
• It has a standard size
• It is dry
• It is re-inserted
• Its production is easy
Answer: It is re-inserted
31. What is the standard value of secondary current of current transformer?
• 2 amp
• 3 amp
• 5 amp
• 10 amp
Answer :5 amp
32. Which type of resistor is used to measure the intensity of light?
• PTC resistor
• NTC resistor
• VD resistor
• LD resistor
Answer: LD resistor
33. Generally metals are good conductors of electricity. Which is a good conductor in terms of conductivity?
• Copper
• Aluminium
• Silver
• Brass
Answer: Silver
34. In virtual load arrangement, in calibration test of wattmeter, energy consumption is reduced due to?
• Absence of load in the test set
• Separate use of low voltage supply across the current coil
• No common point between the two coils
• Reduction of loss in current coil and pressure coil
Answer : Absence of load in the test set
35. Generally the size of wires can be measured using standard wire gauge (SWG). Which instrument must be used to measure the size of wire accurately?
• Vernier caliper
• Depth gauge
• Fuel gauge
• Vicrometer
Answer :Vicrometer
36. The fractional slip of an induction motor is the ratio
of… • rotor input to rotor copper loss
• stator input to stator copper loss
• rotor output to rotor copper loss
• stator copper loss to rotor copper loss
Answer: rotor input to rotor copper loss
37. You have to repair a hot water geyser. The geyser is not giving hot water. The fault can be found by checking ………?
• Inlet is in fully open position
• Correct water level in the tank
• Wiring contacts and loose contacts for open circuit
• Thermostat contacts are connected
Answer: Wiring contacts and loose contacts for open circuit
38. Moving coil device works on the effect of ………..
• Chemical effect
• Electromagnetic effect
• Thermal effect
• Electrostatic effect
Answer: Electromagnetic effect
39. The motor suitable for domestic fans is ………..
• D.C. shunt motor
• D.C. series motor
• Single phase induction motor
• Synchronous motor
Answer: Single phase induction motor
40. Generally MCB is rated at…….. atmospheric temperature.
• 25°C
• 30°C
• 45°C
• 40°C
Answer: 25°C
41. The power factor of LED lamp is?
• Unity
• Leading
• Lagging
• None of these
Answer :Lagging
42. Which type of resistor is used for arc extinguishing purpose?
• PTC resistors
• LDR (light based resistor)
• VDR (voltage based resistor)
• NTC resistors
Answer :VDR (voltage based resistor)
43. The skin effect of a conductor decreases with the increase of …….
• Supply frequency
• Resistivity of the conductor material
• Cross section of the conductor
• Permeability of the conductor material
Answer : Resistivity of the conductor material
44. Two identical capacitors, each of 0-1μF are given. One of these is charged to a potential of 125 volts. It is then disconnected from the charging circuit. The charged capacitor is then connected in parallel with the uncharged capacitor. What voltage will appear across this combination?
• 625 volts
• 62.5 volts
• 6.25 volts
• None of these
Answer : 62.5 volts
45. Which of the following is the minimum size of a 5 ampere copper earth continuity conductor for a domestic installation?
• 1.5 mm2
• 2.5 mm2
• 5 mm2
• 25 mm2
Answer : 1.5 mm2
46. The main switch used in single phase supply is given?
• Fuse in both line and neutral
• Fuse in line and link in neutral
• Link in line and fuse in neutral
• Thick fuse wire in phase and thin fuse wire in neutral
Answer: Fuse in line and link in neutral
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47. In which substance, if the temperature is increased, the resistance will decrease?
• Tungsten
• Carbon
• Nichrome
• Manganese
Answer: Carbon
48. Which type of transformer does not isolate the secondary?
• Potential transformer
• Auto transformer
• Distribution transformer
• Current transformer
Answer :Auto transformer
49. The minimum value of PIV of diodes used in a full-wave rectifier should be?
• 2 x peak AC voltage
• Peak AC voltage
• 4 x peak AC voltage
• 6 x peak AC voltage
Answer: Peak AC voltage
50. Which type of sheet metal is most used in the manufacture of utensils used in homes?
• Tin Platter
• GI Sheet
• Copper Sheet
• Aluminium Sheet
Answer: Aluminium Sheet
51. If the rated voltage used per phase is reduced to half, then the starting torque of the SCIM will be ….. of the starting torque with full voltage –
• ½
• ¼
• 1/√2
• √3/2
Answer :¼
52. Wiring tree system is suitable for…….
• Single-storey building
• Multi-storey building
• Industrial wiring installation
• Printing press
Answer: Multi-storey building
53. ELCB should always be connected in the circuit ……….
• Before Energy Meter
• After Energy Meter
• At the entry of supply to the load after Energy Meter
• At the tail end of the installation
Answer :At the entry of supply to the load after Energy Meter
54. The cathode in the fuel chamber is of…….
• Oxygen
• Ammonia
• Hydrogen
• Carbon monoxide
Answer: Hydrogen
55. Schmitt trigger is basically………..
• An astable multivibrator
• A bistable multivibrator
• A monostable multivibrator
• An oscillator
Answer :A bistable multivibrator
56. Which type of spanner is used to tighten nuts in very small spaces and where high leverage is required?
• Ring spanner
• Socket (box) spanner
• Double ended spanner
• Single ended open jaw adjustable spanner
Answer :Ring spanner
57. The frequency of AC rectified by a full-wave rectifier is?
• Equal to the supply frequency
• Twice the supply frequency
• Zero
• Half of the supply frequency
Answer: Twice the supply frequency
58. Which of the following faults is most commonly found in cables?
• Cross or short circuit fault
• Open circuit fault
• Breakdown of cable insulation
• All of the above
Answer: All of the above
59. How many threads are there in the first tape for cutting internal threads?
• 2 to 3
• 4 to 6
• 8 to 10
• 11 to 12
Answer: 8 to 10
60. For the required current flow capacity, we find that the cross-sectional area of aluminium conductor is larger than that of copper. The reason for this is ………….
• Aluminium heats up more than copper
• The resistivity of aluminium is higher than that of copper
• Aluminium is mechanically weaker than copper
• Aluminium is cheaper than copper
Answer: The resistivity of aluminium is higher than that of copper
61. If a single phase induction motor runs at speed less than rated, which of the following faults is possible?
• Improper size of fuse
• Worn bearings or low voltage or overload
• Open circuit in the winding
• Short circuit in the winding
Answer:Worn bearings or low voltage or overload
62. The function of chalk in tube light is to induce……..?
• Following voltage and limiting current
• Following voltage and increasing current
• Increasing voltage and limiting current
• Increasing voltage and increasing current
Answer :Increasing voltage and limiting current
63. The principle that produces reverse ‘breakdown’ in a Zener diode is called?
• Avalanche effect
• Hall effect
• ‘Breakdown’ effect
• Seebeck effect
Answer :Avalanche effect
64. There is a fault in the geyser i.e. it does not provide hot water when it is switched on. What could be the cause of this fault?
• Thermostat contact is in open position
• Thermostat contacts are connected to each other
• Thermostat is set to very high range
• Thermostat does not disconnect the heater from the supply
Answer :Thermostat contact is in open position
65. Which type of spanner is used in small spaces and where high leverage is required?
• Ring spanner
• Box spanner
• Double ended spanner
• Adjustable spanner
Answer :Ring spanner
66. Fleming’s right-hand rule identifies…….?
• Direction of flux
• Direction of rotation of generator
• Direction of current in motor
• Direction of induced emf
Answer :Direction of induced emf
67. A capacitor of 50 micro farad capacitance is charged to a potential of 200 volts. Find the energy stored in the conductor?
• 1 joule
• 100 milli joule
• 10 joule
• 100 joules
Answer: 1 joule
68. The load regulation of a good power supply unit should not exceed which of the following?
• 0.1%
• 1.0%
• 5.0%
• 10%
Answer :0.1%
69. After absorbing moisture in the air, what will be the colour of silicon bio?
• Blue
• Brown
• Violet
• Pink
Answer: Blue
70. A pn combination passes current when
• p-type material is more positive than n-type material
• n-type material is more positive than p-type material
• Both n-type and p-type materials have equal potential
• There is no potential on both n-type and p-type materials
Answer: p-type material is more positive than n-type material
71. A bistable multivibrator is ………
• Triggered oscillator
• Crystal oscillator
• Free running oscillator
• Saw tooth wave generator
Answer :Triggered oscillator
72. Trigger pulses are essential for the operation of a bistable multivibrator because……..
• It does not contain any RC circuit
• Its circuit cannot switch between the two states automatically
• Transistor operation is controlled by triggering pulses
• All of the above
Answer: All of the above
73. Name the type of cable used in wiring of wooden or metal strip.
• Weather proof cables
• Vulcanized Indian rubber (VIR) cables
• Lead sheathed cables
• Tough rubber sheathed (TRS) watt cables
Answer: Vulcanized Indian rubber (VIR) cables
74. Which part of PMMC device produces eddy current damping?
• Moving coil
• Aluminium former
• Permanent magnet
• Soft iron cylindrical core
Answer :Soft iron cylindrical core
75. The state of charge of a secondary cell can be judged by?
• Terminal voltage
• Colour of the electrolyte
• Level of electrolyte
• Terminal voltage and relative density of electrolyte
Answer: Terminal voltage and relative density of electrolyte
76. When is more flickering observed in fluorescent lamps?
• At low voltage
• At high voltage
• At low frequency
• At high frequency
Answer: At low frequency
77. Voltage stabilizers consist of auto transformers with tapping or stepless change depending upon the type of stabilizer. Auto transformer in servo stabilizers is of…….
• Core type
• Shell type
• Toroid type
• Distributed core type
Answer :Toroid type
78. Two fluorescent lamps of 125 V, 40 W and 125 V, 100 W are connected in series with a supply voltage of 230 V. What happens due to this contact?
• The loss through the 100 W lamp will be more than its rated voltage, hence it will fuse.
• The lamp will fuse very soon because it is marked as 125 V.
• The loss through the 40 W lamp will be more than its rated voltage, hence it will fuse.
• The 100 W lamp will take more current, due to which the 40 W lamp will fuse.
Answer: The loss through the 40 W lamp will be more than its rated voltage, hence it will fuse.
79. What is the use of conservator tank in a transformer?
• To conduct oil measurement
• To increase oil measurement
• Both (A) and (B)
• None of the above
Answer: Both (A) and (B)
80. The metric unit of stimulation is ………
• Lux
• Lumen
• Candela
• Lumen/Watt
Answer: Lux
81. Skin effect is present in …….
• In cable carrying DC current
• In cable DC transmission line
• Only in AC transmission line
• In both DC and AC transmission lines
Answer: Only in AC transmission line
82. The current rating of the MCB selected for a one ton air conditioner is…….
• 10/15 ampere
• 15/20 ampere
• 10/20 ampere
• 15/30 ampere
Answer :10/15 ampere
83. If the circuit of an AC tube is not connected to the choke, then the tube
will • keep glowing continuously
• get fused
• will not glow
• will glow intermittently
Answer: will get fused
84. A 6-pole, 50 Hz, 3 – phase induction has a full load speed of 950 RPM. At half load its speed will be…… RPM?
• 475
• 500
• 975
• 1000
Answer :975
85. Which of the following electrical quantities can you measure with a moving coil instrument?
• D.C. and D.C. voltage
• D.C. and A.C. current
• A.C. voltage
• A.C. current
Answer: D.C. and D.C. voltage
86. A 12 ohm resistor is connected to a 60 V DC source. Calculate the value of current flowing through the resistor?
• 4 ampere
• 5 ampere
• 10 ampere
• 12 ampere
Answer: 5 ampere
87. Cutting compound is used for ………?
• For easy movement of sliding parts of the machine
• To cool the machine
• To cool only the cutting tool
• To cool the job and the cutting tool
Answer: To cool the job and the cutting tool
88. Which instrument is used to cut thin metal sheets?
• Cutting pliers
• Straight slip
• Flat nose pliers
• Chisel
Answer: Straight slip
89. You have to repair a hot water geyser with a leaking tank. What could be the possible causes?
• Leak around thermostat
• Inlet completely open
• Rusting of outer cover
• Excessive inflow of water
Answer :Leak around thermostat
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