UPPCL JE Electrical Free Mock Test PDF Download : UPPCL conducts JE recruitment every year for which thousands of candidates apply and also appear for the exam but not all candidates are able to pass the exam because a large number of candidates appear in this exam and the number of posts is very less, that is why any candidate who is preparing for this exam should prepare for JE very well. So that he can pass this exam easily. For the candidates who are preparing for this exam, UPPCL JE Electrical Free Mock Test has been given in this post, by solving which you can improve your preparation.
UPPCL JE Electrical Free Mock Test PDF Download
1. CANDU (Canadian Deuterium Uranium) reactor uses?
• Highly enriched uranium as fuel and light water as moderator and coolant
• Natural uranium as fuel and heavy water as moderator and coolant.
• Enriched uranium as fuel and ordinary water as moderator and coolant
• Fertilizer only
Answer :Natural uranium as fuel and heavy water as moderator and coolant.
2. What is one of the reasons for noise in a single-phase capacitor motor?
• Short-circuited main coil
• Short-circuited starting coil
• Loose connections in overload relay circuit
• Loose rotator rods
Answer :Loose rotator rods
3. To measure voltage in a high resistance circuit, a voltmeter with high internal resistance should be used. The reason for this is as follows?
• Avoid overloading of the resistor while measuring voltage
• Prevent error when the temperature changes
• Keeps the measurement error small due to the internal consumption of the meter.
• Protects the meter from overloading.
Answer :Keeps the measurement error small due to the internal consumption of the meter.
4. Which of the following types of amplifier is used as the first stage amplifier?
• Class A amplifier
• Class B amplifier
• Class C amplifier
• Class AB amplifier
Answer :Class A amplifier
5. What happens when the speed of a DC motor increases?
• Back emf increases but line current decreases.
• Back emf decreases but line current increases .
• Both back emf and line current increase.
• Both back emf and line current decrease.
Answer :Back emf increases but line current decreases.
6. In the presence of corona, ozone
• Power factor improves.
• Power factor decreases.
• Material corrodes.
• Control improves.
Answer :Material corrodes.
7. Copper as a conductor used in cables is…….
• Hard drawn
• Annealed
• Alloyed with chromium
• Hardened and tempered
Answer :Annealed
8. The degree of purity of copper used in electrical work must be very high………….
• 90&
• 95.5&
• 969&
• 99.9&
Answer :99.9&
9. What will be the frequency of emf generated by an 8-pole alternator rotating at 600 rpm?
• 20 Hz
• 40 Hz
• 60 Hz
• 80 Hz
Answer :40 Hz
10. For maintenance of EHB equipment it should be first isolated and connected to the ground because
• Charging discharges the capacitance to the ground.
• Provides safety to the operating personnel.
• It provides low impedance.
• Both (a) and (b)
Answer :Both (a) and (b)
11. The back emf set up in the starter of a synchronous motor depends on which of the following?
• Rotor speed only
• Excitation of rotor only
• Excitation and speed of rotor
• Coupling angle, rotor speed and excitation
Answer :Excitation of rotor only
12. Single layer winding is one in which
• Two coil-backs are placed in each slot.
• Three coil-backs are placed in each slot.
• One coil-back is placed in each slot.
• None of the above
Answer :One coil-back is placed in each slot.
13. Corona is affected by…..
• Shape of conductor
• Texture and surface condition of conductor
• Operating voltage
• All of the above
Answer :All of the above
14. In a synchronous motor damping winding is generally used for which of the following?
• To provide starting torque only
• To reduce the noise level
• To reduce the eddy currents
• To prevent huting and to provide starting torque
Answer :To prevent huting and to provide starting torque
15. An electronics device that converts direct current (DC) into alternating current (AC) is called………
• Converter
• Rectifier
• Inverter
• Diode
Answer :Inverter
16. The transformer used for starting high induction motor is?
• Auto transformer
• Step-down transformer
• Potential transformer
• Two-case transformer
Answer :Step-down transformer
17. For wiring a house having equal number of points and terminal system having wire loops, identify which of the following wiring accessories is required to reduce the cable length?
• Two way switch
• Intermediate switch
• Two plate ceiling rose
• Three plate ceiling rose
Answer :Three plate ceiling rose
18. Which type of insulator is used to keep high tension overhead conductors straight on rows of electric poles?
• Post Insulator
• Pin Type Insulator
• Stay Insulator
• ‘Shackle’ Insulator
Answer :Pin Type Insulator
19. What are used in active tuning circuits?
• Diodes, Transistors and ICs
• Capacitors and Resistors
• Transformers
• Transformers and Resistors
Answer :Diodes, Transistors and ICs
20. The use of negative feedback in an operational amplifier (OP-amp) increases?
• Frequency return
• Amplification stability
• Gain
• None of these
Answer :Amplification stability
21. To start oscillating, the loop gain of the oscillator must be single…………..
• less than
• equal
to • greater than or less than
• equal
to Answer :greater than or less than
22. ‘Pre-set’ is a type of
• Variable value resistors
• Adjustable value resistors
• Fixed value resistors
• Stepped resistors
Answer :Adjustable value resistors
23. The objective of power transmission is to…..
• The transmission system must necessarily be as efficient as possible with low line losses.
• The voltage regulation of the transmission line must be zero or minimum.
• Both (A) and (B)
• None of the above
Answer :Both (A) and (B)
24. Which of the following motors is suitable for high starting torque?
• Shunt motor
• Cumulative compound motor
• Series
• Compound motor
Answer :Series
25. Which loss in a DC generator varies with load?
• Copper loss
• Eddy current loss
• Hysteresis loss
• Air friction loss
Answer :Copper loss
26. As per IE rules, caution notices have to be displayed on electrical equipment/lines based on the voltage level. What type of caution notices should be displayed on equipment/lines operating between 650 V to 33 kV?
• “Caution” – Medium Voltage
• “Caution” – High Voltage
• “Caution” – Extra Voltage
• “Caution” – Very High Voltage
Answer :“Caution” – High Voltage
27. The current flowing through each diode of a bridge rectifier is equal to?
• load-current
• twice the load-current
• half the load current
• four times the load current
Answer :load-current
28. What is the number of parallel paths in a Wave Wood armature?
• As many poles as the machine has
• Equal to two, independent of the number of poles
• Equal to the number of commutator segments
• Equal to the number of armature conductors
Answer :Equal to two, independent of the number of poles
29. The conversion of energy in a thermal power station is from …..
• Heat energy to electrical energy
• Light energy to electrical energy
• Water energy to electrical energy
• Solar energy to electrical energy
Answer :Heat energy to electrical energy
30. The function of the moderator in a nuclear reactor is?
• Absorbing excess neutrons
• Increasing the energy of neutrons
• Slowing down the neutrons
• None of the above
Answer :Slowing down the neutrons
31. The direction of the magnetic field near a chargeless conductor is determined by which of the following rules?
• Fleming’s left hand rule
• Right hand thumb rule
• Fleming’s right hand rule
• None of the above
Answer :Fleming’s left hand rule
32. The electrolyte used in lead acid battery is…….
• Silver potassium cyanide
• Dilute sulphuric acid
• Ammonium chloride
• Potassium hydroxide
Answer :Dilute sulphuric acid
33. The latest lamp among fluorescent lamps is?
• Quick start lamp
• Pre-start lamp
• Glow lamp
• Quick start lamp
Answer :Glow Lamp
34. As a precaution, the temperature of heating element used in heaters, electric irons, water heaters should not exceed ……..
• 335°C
• 635°C
• 735°C
• 1035°C
Answer :1035°C
35. Which method of speed control is mainly applied in electric trains?
• Series field tapping method
• Series field diverter method
• Series parallel method
• Supply voltage control method
Answer :Series field diverter method
36. A diode of a bridge rectifier connected to 100 V 50 Hz AC input is found to be faulty. The DC output of this circuit is 90 V. The minimum value of PIV of the diode required for replacement is…..
• 45V
• 50 V
• 100 V
• 150 V
Answer :100 V
37. If the slot angle is 30 electrical degrees and main wrapping (working wrapping) is started from slot no. 1 then initial wrapping should be started from?
• From the same slot
• From slot no. 2
• From slot no. 3
• From slot no. 4
Answer :From slot no. 4
38. Which type of DC motor is used in lifting and cranes?
• DC Series Motor
• DC Shunt Motor
• DC Cumulative Compound Motor
• DC Differential Compound Motor
Answer :DC Series Motor
39. Delayed-action case fuse is used for………?
• Motor circuits
• Lighting circuits
• Fluorescent lamp circuits
• Heating circuits
Answer :Motor circuits
40. When a working woman suddenly holds the metal part of the handle of a kettle which was put on ‘ON’, she feels a shock because of……..
• The fuse wire in the circuit is at higher potential.
• The kettle is not grounded .
• There is no water in the kettle.
• The safety plug is faulty.
Answer :The kettle is not grounded
41. The main purpose of oil in OCB is………..
• To provide insulation
• To provide cooling of contacts
• To extinguish sparks
• None of the above
Answer :Spark extinguishing
42. Synchronous motor starts at?
• Only at lagging power factor
• Only at leading power factor
• Both types of power factors, i.e., lagging and leading
• None of the above
Answer :Both types of power factors, i.e., lagging and leading
43. The direction of rotation of a universal motor is reversed by?
• By interchanging field connections only.
• By interchanging armature connections only.
• By interchanging field or armature connections
• None of the above
Answer :By interchanging field or armature connections
44. The drawback of a full-wave rectifier as compared to a half-wave rectifier is that
• Its ripple frequency is high.
• Its d.c. output level is high.
• Each diode carries half the load current.
• It eliminates the need for a bulky transformer with a protruding central terminal in the secondary coil.
Answer :It eliminates the need for a bulky transformer with a protruding central terminal in the secondary coil.
45. Which device works on the thermal effect of electric current?
• Washing machine
• Food mixer
• Toaster
• Table fan
Answer :Toaster
46. Fluorescent lamp which can be used in flashing circuit is?
• ballast lamp
• pre-heat lamp
• instant start lamp
• rapid start lamp
Answer :instant start lamp
47. Which one is not an electrical conductor?
• Copper
• Aluminium
• Silver
• Glass
Answer :Glass
48. A 1 MHz oscillator produces a wave whose length is………….
• 3 m
• 3 cm
• 300 m
• 300 cm
Answer :300 m
49. A single-phase universal motor fails to start because
• Supply voltage is not available.
• Supply voltage is more than the capacity of the motor.
• Length of brushes is reduced by 10 ohms.
• There is no load on the motor at the time of starting.
Answer :Supply voltage is not available.
50. The typical life expectancy of a cable is.
• 5 years
• 15 years
• 25 years
• 50 years
Answer :15 Years
UPPCL JE Electrical Practice Set PDF download
51. What are used in passive tone-control circuits?
• Diodes and Transistors
• Capacitors and Resistors
• Diodes and Resistors
• Transformers
Answer :Capacitors and Resistors
52. IC CA 810 can be used as an audio output amplifier in…….
• Radio receiver
• TV receiver
• Tape recorder
• All of these
Answer :All of these
53. While using cables, it is advisable to use separate bundles for strength and control in wiring cables. The reason for separating the bundles is . . . .?
• To avoid heat transfer from power cable to control cable
• To prevent the two cables from mixing
• To make the wiring look good
• To avoid wrong connection between the two cables
Answer :To avoid heat transfer from power cable to control cable
54. The rated rotation speed of a given shunt motor is 1050 rpm. Which of the following speed control methods will be suitable to run this motor at 1200 rpm speed?
• Armature current resistance control method
• Field resistance control method
• Ward-Leonard control method
• None of the above
Answer :Field resistance control method
55. Tarapur Atomic Power Station is located in?
• CANDU type reactors
• Boiling Water Reactors
• Pressurized Water Reactors
• Gas Cooled Reactors
Answer :Boiling Water Reactors
56. Before installing the motor it is necessary to provide a proper foundation. Where the foundation bolts are buried in the concrete, their position must be determined with great accuracy. The exact location of the foundation bolts is done by…..
• Steel rule
• Template
• Try square
• Plum bob
Answer :Template
57. The PIV voltage across the diode of a half-wave rectifier is equal to-
• Half the peak secondary voltage
• Equal to the peak secondary voltage
• Peak-to-peak secondary voltage
• Peak-to-peak primary voltage
Answer :Peak-to-peak secondary voltage
58. Mercury vapour is discharged in HPMV lamp?
• At high pressure
• At medium pressure
• At low pressure
• None of these
Answer :At low pressure
59. Service connection at consumer premises is provided either through overhead or underground cable by tapping from overhead line. Service connection line should be tapped from overhead line at … …..
• Central extension only
• Any point through extension
• Point of support
• Any point one metre away from the support
Answer :Point of support
60. What will happen when a line conductor of an overhead supply line breaks and touches ground?
• Current will flow to ground
• Supply voltage will increase
• No current will flow in the conductor
• None of the above
Answer :Current will flow to ground
61. In a DOL starter, the NVC is connected across one phase and neutral of a 3 – phase, 415 V, 50 Hz supply and operates normally. What is the rated voltage of the NVC?
• 220 V
• 230 V
• 400 V
• 415 V
Answer :230 V
62. Which power plant is free from dangerous atmospheric pollution problem?
• Thermal power plant
• Nuclear power plant
• Wind power plant
• All of these
Answer :Wind power plant
63. Which of the following has the highest magnetic permeability?
• Paramagnetic materials
• Diamagnetic materials
• Ferromagnetic materials
• Vacuum
Answer :Ferromagnetic materials
64. In D.C. generators, the brushes may wear out quickly because of?
• Incomplete contact
• Excessive spark generation
• Rough commutation surface
• Any of the above
Answer :Any of the above
65. Interpoles are usually arranged in?
• Parallel to the area packing
• In series with the area packing
• Parallel to the load
• In series with the load
Answer :In series with the area packing
66. Which of the following electrical breaker is generally used in railway electrification?
• Air blast circuit breaker
• Miniature oil circuit breaker
• Bulk oil circuit breaker
• SF circuit breaker
Answer :Air blast circuit breaker
67. The triangular file size required to sharpen a 14 point one inch (25 mm) tenon saw is…
• 75mm
• 100 mm
• 110 mm
• 125 mm
Answer :75mm
68. MCCB का तात्पर्य है ……..।
• Miniature Current Circuit Breaker
• Maximum Current Circuit Breaker
• Moulded Cabinet Circuit Breaker
• Moulded Case Circuit Breaker
Answer :Moulded Case Circuit Breaker
69. Flip-flops are also known by which of the following names…….
• Monostable Multivibrator
• Boyastable Multivibrator
• Mono-shot Multivibrator
• Astable Multivibrator
Answer :Boyastable Multivibrator
71. Fuse should be connected in …….
• Series in neutral conductor
• Parallel to neutral conductor
• Series with live conductor
• Parallel to live conductor
Answer :Series with live conductor
72. The input and output resistances of an operational amplifier are?
• 2 k ᘯ 200 k ᘯ
• 2M ᘯ, 20 ᘯ
• 200 k ᘯ, 2 k ᘯ
• 2 ᘯ, 2 M ᘯ
Answer :2M ᘯ, 20 ᘯ
73. In a riveted joint the edges of the plates are simply placed one over the other and riveted. This joint is called?
• Lap joint
• Butt joint
• Edge joint
• Corner joint
Answer :Lap joint
75. Which of the following methods would you prefer for a 10 MVA transformer?
• Oil pressure, Air pressure
• Air pressure
• Oil pressure, Air pressure
• Oil pressure, Water pressure
Answer :Oil pressure, Air pressure
76. Salient-pole rotors, compared to cylindrical rotors, are?
• Small in diameter and large in axial length
• Large in diameter and small in axial length
• Large in both diameter and axial length
• Small in both diameter and axial length
Answer :Large in diameter and small in axial length
77. Which of the following instruments will you combine together for measurement?
• Frequency meter and PF meter
• Volt meter and frequency meter
• Volt meter and PF meter
• Vault meter and Volt meter
Answer :Volt meter and frequency meter
78. The size of conductors used in power cables depends on?
• Operating voltage
• Power factor
• Current flowing
• Type of insulation used
Answer :Current flowing
79. The underwriter’s knot is designed to resemble pendant holders inside the support on twin-twisted or twin-core flexible cable?
• Avoiding loose connection of ends
• Maximizing mechanical strength
• Minimizing distortion from the ends of the support
• Preventing excess wire from sticking out of the cap cover
Answer :Minimizing distortion from the ends of the support
80. Carbon type potentiometers are made of?
• Only linear type
• Only logarithmic type
• Only stepped type
• Both linear and logarithmic types
Answer :Both linear and logarithmic types
81. Which of the following devices reduces high voltage and current to safe values for measurement?
• Megaohmmeter
• Autotransformer
• Variable transformer
• Instrument transformer
Answer :Instrument transformer
82. Which of the following machines combines the functions of a synchronous motor and a DC generator?
• MG set
• Rotary converter
• Synchronous motor
• Brushless alternator
Answer :Rotary Converter
83. Scott combination is used for ………transfer.
• Single-phase supply to 3-phase supply
• Single-phase supply to 2-phase supply
• 3-phase supply to 2-phase supply
• Star-connected primary to delta-connected secondary
Answer :3-phase supply to 2-phase supply
84. The motor whose rotating magnetic field of rotor and stator rotates at same speed is called…….
• Induction motor
• Ring induction motor
• Synchronous motor
• Universal motor
Answer :Synchronous motor
85. Which of the following methods is economical for finding the no-load losses of a long-shunt DC motor?
• Hopkinson test
• Swinburne test
• Retardation test
• None of the above
Answer :Swinburne test
86. Cables are generally used for voltages up to …..
• 33 kV
• 11 kV
• 66 kV
• 400 V
Answer :33 kV
87. The height of the head of a snap head rivet is measured in?
• 0.5 x diameter of rivet
• 0.7 x diameter of rivet
• 0.9 x diameter of rivet
• 1.1 x diameter of rivet
Answer :0.7 x diameter of rivet
88. The armature of a DC generator field is made laminated because of?
• To reduce its overall weight
• To make the core non-conducting
• To reduce ripple current losses
• All of the above
Answer :To reduce ripple current losses
89. A Colpitts oscillator uses?
• A tapped inductor
• A tapped capacitor
• Neither a tapped inductor nor a capacitor
• Both a tapped inductor and a capacitor
Answer :A tapped capacitor
90. The no-load current of an induction motor is approximately …….. percent of the full load current.
• 10
• 20
• 40
• 75
Answer :40
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