UPPCL JE Electrical Practice Set PDF download : When you prepare for any exam, it is very important for you to first know the pattern and syllabus of that exam so that you can prepare well for it in the shortest time. For the candidates who are preparing for JE Electrical exam, a test has been given in this post according to the pattern and syllabus of UPPCL JE Electrical exam, by solving which you can make your preparation much better. For all the candidates preparing for UPPCL JE Electrical, many more online practice sets have been provided on our website, by solving which they can make their preparation better.
UPPCL JE Electrical Practice Set PDF download
1. A fuse in an electrical circuit ‘blows’ as a result of high . . . . . .
• Voltage produced by a short circuit
• Current produced by a short circuit
• Voltage produced by an open circuit
• Current produced by an open circuit
Answer: The current flowing due to a short circuit
2. What is the cause of buckling defect in lead acid batteries?
• Keeping the cell in discharged condition for a long period
• Short circuiting between the plates
• Overcharging and discharging
• Overloading the battery
Answer: Overcharging and discharging
3. The surge impedance of the cable is approximately …….
• 20 ᘯ
• 50 ᘯ
• 100 ᘯ
• 250 ᘯ
Answer: 100 rupees
4. A steel rod should never be used as a ……..
• Screwdriver
• Hammer
• Knife
• All of these
Answer: All of these
5. A Mr. Page half wave rectifier has an AC input of 415 V 50 Hz. The ripple frequency of the DC output is …… in pulse seconds.
• 50
• 100
• 150
• 300
Answer: 150
6. Are biogas plants suitable?
• For metal refining industries
• For commercial buildings
• For rural areas
• For coal mines
Answer: For rural areas
7. Wire gauge is used to measure ……..
• Length of wire
• Area of wire
• Diameter of wire
• Thickness of the resisting surface of the wire
Answer: Diameter of wire
8. Which type of transformer does not have ohmic resistance and magnetic leakage which results in no loss?
• Distribution transformer
• Power transformer
• Ideal transformer
• Instrument transformer
Answer: Ideal transformer
9. What is the main purpose of providing earthing to electrical equipment?
• Protecting equipment from excess current
• Maintaining line current constant
• Maintaining supply voltage constant
• Increasing the life of equipment
Answer: To protect the equipment from excess current
10. When the winding of a coil induction motor is in steady state, the rotating frequency is?
• Zero
• More than the static frequency
• Less than the static frequency
• Equal to the static frequency
Answer: Equal to the anchor frequency
11. Corona has the disadvantage that ……….
• It interferes with nearby communication circuits.
• It starts introducing harmonics in the transmission lines, predominantly third harmonics.
• Power is lost.
• All of the above
Answer: All of the above
12. Transistor-Hartley oscillator is used in……
• Inductive feedback
• Untaped coil
• Entire coil in output circuit
• None of the above
Answer: None of the above
13. Which instrument is used to measure insulation resistance?
• Ohmmeter
• Voltmeter
• Ammeter
• Megger
Answer: Mager
14. HPMV produces light?
• 30 lumens/watt
• 50 lumens/watt
• 60 lumens/watt
• 80 lumens/watt
Answer: 50 lumens/watt
15. What is the unit of reluctance?
• Tesla
• At/Wb
• At/m
• Wb
Answer: At/Wb
16. The size of a single phase induction motor equivalent to a three-phase induction motor, for the same rating will be……….
• Three times
• Same
• 1.5 times
• One third
Answer: 1.5 times
17. Intercom takes place?
• Wireless internal communication system
• Wired internal communication system
• Mobile communication system
• Visual (video) communication system
Answer: Video communication system
18. Soil resistance depends on the factors
• Depth of electrode
• Moisture
• Nacl
• All of these
Answer: All of these
19. What are the main sources of biogas production?
• Cow dung
• Human excreta
• Cattle moist waste
• All of the above
Answer: All of the above
20. What will be the value of a resistor whose coloured strips are red, green, orange and gold respectively?
• 24000 Ohm + 10&
• 25000 Ohm + 5&
• 26000 Ohm + 10&
• 27000 Ohm + 5&
answer. 25000 ohms + 5&
21. What is required for a stereophonic system?
• Two separate microphones
• Two separate amplifiers
• Two separate loudspeakers
• All of the above
Answer. Two separate promoters
22. Electrical power is transmitted through ……….. of the following systems.
• Overhead system
• Underground system
• Both (A) and (B)
• None of these
Answer: Both (A) and (B)
23. The size of the teeth of a hack saw blade is directly related to its pitch. How is the pitch described?
• For the entire length of the hack saw blade
• Per 100 mm length
• 25 mm per length
• 10 mm per length
Answer: Per length of 25 mm
24. IGBT stands for ………….
• Integrated Gate Bipolar Transistor
• Insulated Gate Bipolar Transistor
• Integrated Gate Binary Transform
• Insulated Gate Based Triggering
Answer. Insulated Gate Bipolar Transistor
25. A 2 kW, 200 V DC generator will supply current to a load?
• 2 Ampere
• 4 Ampere
• 10 Ampere
• 20 Ampere
Answer: 10 ampere
26. Distilled water is used in electrolyte because it
• Stops or slows down local reaction.
• Increases the speed of electrochemical reaction.
• Increases the relative density of electrolyte.
• Prevents polarization.
Answer: Stops or slows down local action.
27. Every appliance should be checked for insulation resistance before installation. For water heaters the insulation resistance should not be less than…..
• 1 megaohm
• 2 megaohm
• 0-5 megaohm
• 0-25 megaohm
Answer: 1 megaohm
28. The given Wheatstone bridge is balanced when P = 100 W, Q = 1 kW and S = 120 W. Find the value of the unknown resistance.
• 1.1 kW
• 1.2 kW
• 1.3 kW
• 1.5 kW
Answer: 1.2 kW
29. If the load of a motor is increased beyond its full load, what will be the maximum effect of increase in slip?
• Increase in power factor
• Decrease in power factor
• Increase in current
• Decrease in current
Answer: increase in current
30. If the fluorescent tube lights up after removing the faulty starter, then the fault is?
• In the choke
• In the tube
• In the starter
• In the line switch
Answer: In the starter
31. The reading indicated by the megger during continuity test in an installation is ………
• 0 mega ohm
• 1 mega ohm
• 500 mega ohm
• Infinite mega ohm
Answer: 0 mega ohm
32. A Mr. Page half wave rectifier has an AC input of 415 V 50 Hz. The ripple frequency of the DC output in pulses per second is ………
• 50
• 100
• 150
• 300
Answer: 300
33. Biogas contains?
• Only methane
• Methane and carbon dioxide with some impurities
• Only ethane
• Special organic gases
Answer. Methane and carbon dioxide with some impurities
34. Voltage follower amplifier is used?
• For large voltage amplification
. • For current amplification.
• To avoid loading effect of the signal source.
• For all the above functions.
Answer: To avoid the loading effect of the signal source.
35. Earthing should be designed in such a way that
• Ground insulation should be minimum
• Ground insulation should be maximum
• Ground insulation should always be zero
• None of the above
Answer: Ground insulation should be minimum
36. When earthing fault occurs?
• Voltage potential on the ground increases due to earthing.
• Voltage potential on the ground decreases due to earthing.
• Voltage potential on the ground remains zero despite the fault
• None of the above
Answer: Due to earthing the voltage potential on the ground increases.
37. The primary winding of a transformer is?
• Always low voltage winding
• Always high voltage winding
• Can be low voltage or high voltage winding.
• None of the above
Answer. There can be low voltage or high voltage winding.
38. The minimum number of RC networks to be connected in cascade in an RC phase shift oscillator is…
• one
• two
• three
• four
Answer: Three
39. A 10 KVA transformer is drawing 400 watts of power in open circuit test and 900 watts in short circuit test. What will be the copper loss at 50% load?
• 1300 watts
• 500 watts
• 225 watts
• 450 watts
Answer: 225 watts
40. The rotating current frequency of a spiral induction motor depends on:
• Rotating conductor
• Rotating inductance
• Magnitude of slip
• Inductive reactance
Answer: On the amount of slip
41. What is the power input of an electric heater that draws 4 amperes from a 250 volt supply source?
• 360 Watts
• 480 Watts
• 720 Watts
• 960 Watts
Answer. 960 watts
42. The state of the electrolyte of the battery is measured in terms of ………
• Current value
• Relative density
• Acid content
• Output voltage
Answer: Relative density
Uppcl Je Electrical Question Paper
43. A 3kW DC motor connected to a constant-voltage supply has a speed of 2000 rpm. This speed has to be changed to 2500 rpm. Which speed control method will you use?
• Increasing the back emf with a resistor
• Limiting the armature current with a shunt resistor
• Varying the voltage with a starter
• Varying the field current with a field rheostat
Answer: By converting the field current with a field rheostat
44. The carbon brush of a DC machine becomes short due to wear during the running condition of the machine. At what length the brush has to be replaced?
• At 1/2 of the original length
• At 1/3 of the original length
• At 3/4 of the original length
• At 2/3 of the original length
Answer: At 2/3 of the original length
45. The starting current of a starterless 220 V, 10 HP shunt motor having armature resistance of 0.2 ohm is?
• 110 A
• 1100 A
• 11 A
• 11000 A
Answer: 1100 A
46. Which type of controlling force is a pointing device that can be placed in any position?
• Gravity control
• Spring control
• Fluid friction control
• Hydraulic friction control
Answer: Spring control
47. For proper parallel operation, polyphase alternators must have equal ……..
• kVA rating
• Voltage rating
• Speed
• Illumination
Answer: voltage rating
48. How is the emf affected if the armature of a DC motor rotates?
• Self influenced
• Back emf
• Mutually induced emf
• None of the above
Answer: Back EMF
49. The fusing rate of 35 SWG copper wire is ……….?
• 6 ampere
• 5-5 ampere
• 5 ampere
• 4 ampere
Answer: 5 ampere
50. In a fuel cell, electrical energy is produced from ……..
• Reaction of hydrogen with oxygen
• Thermoionic action
• Burning of fuel in the absence of oxygen
• None of the above
Answer: By the reaction of hydrogen with oxygen
51. What is the main condition for parallel connection of DC generators?
• Capacity of both generators should be same.
• Field critical resistance should be same .
• Polarity of both generators should be same.
• Maximum capacity of both generators should be same .
Answer: The polarity of both the generators should be same.
52. When you start a DC motor, you find that it starts jerkily. What is the fault of this effect?
• Line voltage is too high.
• There is a ‘short circuit’ in the field winding.
• The contact terminal of the starter is pitted.
• The grade of carbon brush is wrong.
Answer. The contact terminal of the starter is pitted.
53. A pre-amplifier is a
• current amplifier
• voltage amplifier
• power amplifier
• optical amplifier
Answer. Voltage amplifier
54. Impurities present in the electrolyte can cause internal short circuit condition which is called?
•
Depolarization • Electrolysis
• Local action
• Polarization
Answer: Local action
55. For speeds more than 3000 RPM, machines are used……..
• Induction motor
• Synchronous motor
• Universal motor
• None of these
Answer: Universal Motor
56. The amount of moisture present in the soil affects the resistance of the soil
• Increases
• Decreases
• Does not affect
• None of these
Answer: decreases
57. Which measuring instrument is an indicating instrument?
• Reed type frequency meter
• Energy meter
• Ammeter
• Temperature recording instrument
Answer: ammeter
58. The insulating material used to contact the leads of an electric heater is …..
• Bakelite material
• Porcelain material
• Rubber material
• Asbestos material
Answer. Porcelain material
59. Which statement describes the special feature of routine preventive maintenance?
• Maintenance schedule should be decided on the basis of maintenance report entered in the maintenance card
• Maintenance of the machine can be done either during work or by stopping the machine for short intervals.
• Maintenance should be done irregularly
• Maintenance should be done only when there is some problem or defect in the machine
Answer. Maintenance of the machine can be done either during work or by stopping the machine for a short interval.
60. According to IS 3156, the secondary voltage for single phase and series values of 3-phase potential transformer will be……
• 240 V and 415 V
• 230 V and 400 V
• 220 V and 380 V
• 100 V and 110 V
Answer. 100 V and 110 V
61. Which of the following circuit breakers takes minimum time to set up?
• Air blast
• Minimum oil
• Bulk oil
• Sulfur hexafluoride (SF6)
Answer: Sulfur hexafluoride (SF6)
62. Which of the following devices is an over compound DC generator?
• Electroplating
• Railways
• Welding generators
• Lathes
Answer: Railways
63. The terminals that make up a TRIAC are the following:
• Base, Emitter, Collector
• Anode, Cathode, Gate
• Source, Drain, Gate
• MT, MT, W Gate
Answer. MT, MT, and gate
64. The power factor of an alternator is determined by its…….
• Speed
• Load
• Illumination
• Prime mover
Answer: Load
65. To generate a signal of one megahertz, the most suitable oscillator is…….
• Colpitts oscillator
• Phase shift oscillator
• Wayne-bridge oscillator
• None of the above
Answer: Colpitts Oscillator
66. If the number of coils/poles/phases in a winding is one, then such a winding is known by what name?
• Distributed winding
• Tangled winding
• Decentralized winding
• Concentrated winding
Answer: Decentralized winding
67. Which winding of a transformer has the most turns?
• Low voltage winding
• High voltage winding
• Winding does not depend on the number of turns
• All of the above.
Answer: High voltage winding
68. The critical valve of surge impedance of long transmission line is………..
• 1000ᘯ
• 400ᘯ
• 250ᘯ
• 50ᘯ
Answer: 400
69. The function of qualizer ring is?
• To prevent uneven distribution of current in brushes
• To help reduce spark generation
• Both of the above
• None of the above
Answer: Both of the above
70. Peak factor is the ratio of
• peak value to RMS value
• peak value to average value
• RMS value to average value
• RMS value to average value
Answer: Peak value with RMS value
71. Which of the following is a good conductor?
• China clay
• Porcelain
• Graphite
• Glass
Answer: Graphite
72. What will be the colour bands of 1-5 ohm resistors?
• Brown, green, brown
• Brown, green, golden
• Brown, golden, green
• Brown, golden, golden.
Answer: Brown, green, golden
73. Which one of the following is a cause for an active DC generator to lose residual magnetism?
• Armature core is not properly lined.
• Generator is kept idle for a long time.
• Armature resistance is more than 1 ohm.
• Incorrect brush position.
Answer: The generator is kept idle for a long time.
74. The number of turns per volt in a transformer is 6. The primary and secondary voltages are 240 volts and 32 volts respectively. Find the number of turns in the primary and secondary windings?
• 880 rounds; 200 rounds
• 1200 rounds; 192 rounds
• 1440 rounds; 192 rounds
• 1550 rounds; 200 rounds
Answer: 1440 rounds; 192 rounds
75. The minimum distance from the centre of a rivet hole to the adjacent edge of the plate in a riveted joint is called?
• Back pitch
• Allowance
• Tolerance
• Margin
Answer: Margin
76. The value of forward current of LED is?
• 100 mA Is 500 mA
• 50 mA Is 100 mA
• 10 mA Is 50 mA
• 0 mA Is 5 mA
Answer: 10 mA is 50 mA
77. You need to measure the ripple voltage of a DC power supply to confirm the manufacturer’s specifications. What instrument do you need to measure this?
• DC Voltmeter
• AC Voltmeter
• Oscilloscope
• Vacuum Tube Voltmeter
Answer. Oscilloscope
78. Which of the following is responsible for crushing of metal in a riveted joint?
• Too much thickness of plates
• Too little thickness of plates
• Too much diameter of rivet
• Too little diameter of rivet
Answer: The diameter of the rivet is too large
79. With increase in temperature, insulation resistance…………..
• Remains unchanged.
• Decreases linearly.
• Increases linearly.
• Decreases exponentially.
Answer: It decreases rapidly.
80. The force required to move the pointer in an indicating instrument is…………..
• Deflecting force
• Controlling force
• ‘Eddy’ current damping force
• Air friction damping force
Answer: deflecting force
81. Universal motor runs……..
• At high speed with D.C. supply and with less sparking
• At high speed with A.C. supply and with less sparking
• Same speed on both A.C. and D.C. supplies •
At high speed with A.C. supply but with increased sparking at brushes
Answer. With D.C. supply at high speed and with less sparking
82. The process of limiting high frequencies is called?
• pre-emphasis
• de-emphasis
• tuning
• None of the above
Answer: pre-emphasis
83. Details regarding ‘end connection’, ‘group connection’ and ‘lead connection’ should be taken?
• Before opening the motor
• Before removing the wrappers
• After removing the wrappers
• After measuring the wrappers
Answer: Before removing the packaging
84. Which of the following circuit breakers has high reliability and negligible maintenance?
• Air blast circuit breaker
• SF circuit breaker
• Oil circuit breaker
• Vacuum circuit breaker
Answer: SF circuit breaker
85. Calculate the current and resistance of the heating element for a 250 V, 1500 W electric heater operating at 500°C?
• 4 ampere and 62.5 ohm
• 5 ampere and 55.5 ohm
• 6 ampere and 41-66 ohm
• 7.5 ampere and 31:25 ohm
north. 6 amps and 41-66 ohms.
86. When is the efficiency of a DC machine maximum?
• Iron loss when equal to mechanical loss
• Variable loss when equal to constant loss
• Constant loss when equal to field copper loss
• Unwanted loss when equal to long loss
Answer: If the variable deficit is equal to the fixed deficit
87. A 1000 watt heater is connected to a 240 volt AC supply. What is the current drawn by the heater?
• 4.006 amperes
• 4.106 amperes
• 4.160 amperes
• 4.166 amperes
Answer: 4.166 amperes
88. What is the purpose of connecting a rheostat in a slip-ring induction motor?
• Limiting the starting current
• Increasing the starting current
• Decreasing the starting current so that starting torque can increase
• None of the above
Answer: Decrease the starting current so that the starting torque can increase
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