Top 100 MCQs with Answer for WAPDA/PESCO Electrical/Electronic Job in Pakistan

1. Main feature of crystal diode _________? stability
2. The ROC of Z- Transform lies? z=0
3. Which one is used to generate DSB in AM? balanced modulator
4. z transform is used when a signal is not? absolute summable, square summable, converges
5. If ROC does not include unit circle then? Z- transform converges
6. Any constant of t domain is an impulse in f domain with? infinite height, zero width, unit area
7. By which a meter after checking with no current returns to its previous state? Controlling Torque
8. The instrument used only for DC measurement? Induction type
9. A moving iron ammeter coil has few turns of thick wire in order to have: Low resistance
10. A permanent magnet coil meter has which features Low power consumption, no hysteresis loss, reduced eddy current, reduced damping
11. Super position theorem relates to? Thevenin and Norton theorems
12. …….is like a 3 phase gives constant power? two-phase
13. Variable speed requirements can be met by using? Wound rotor
14. The circuit in which currently leads the voltage by 90 degrees or voltage lags the current by 90 degrees?  Capacitive circuit
15. Which of the following convert’s thermal energy to kinetic energy? Rocket
16. The Power plant for which the availability of power is least reliable is? Wind
17. Which type of engine uses maximum air fuel ratio? Gas turbine
18. Which of the following relay is used in Motor for protection? Thermal relay
19.  Solid grounding is used for voltages? below 660 V
20. RC snubber circuit is used to suppress? a rate of change of voltage
21. Which of the following is not the fundamental part of the transformer core, windings, insulation, mutual flux? Mutual flux
22. Ideal transformer is characterized by? winding resistance=0, core loss=0, core permeability=infinite
23. Natural uranium contains _________ of U-235? 0.7%
24. Transmission line voltage is generally high voltage ________ alternating current? 3-phase
25. Which thing happens in gas discharge lamps? Ionization in vapor or gas
26. The battery used for electric power storage is? Lead acid cells
27. In a submarine power system, the power is transmitted through_________ cable? HV DC
28. By connecting the conductive surfaces of all the equipment to the same ground wire, the risk of electric shock is? Minimized
29. Taxila was the capital of? Gandhara
30. In earlier hours, on September 6, India cross a border of Pakistan, city? Lahore
31. The northern end of Pakistan is occupied by a western range of which of following? Himalayan range
32. Which of the following Rukn-e-Islam is called a shield? Fasting
33. The literal meaning of word Qibla is? Anything in front
34. Youm-e-Arafat is known as? Hajj day
35. Largest, heaviest and longest mammal an animal is? Blue whale
36. Wimbledon tournament is of which game? Lawn tennis
37. The old name of Iran was? Persia
38. Who first brought Kashmir issue in the security council of UNO? India
39. The management organization in any industry acts upon? Principles of management
40. A small voltage (less than 10V) is considered to be? Stray voltage
41. The component of switchgear which sense fault and initiate trip are? Protective Relay
42.  Two overload Protection relays used are Instantaneous over current and? Time Overcurrent
43. Which of the following is not a purpose of disturbances monitoring equipment? incorrect protection setting
44. The principle of ____ is used to analyze fault in the power system? Superposition Theorem
45. A team from the same department and functional area that involves efforts to improve work activities? Problem-solving team
46. Single is for double and one is for? Two
47. Which one is odd in the list…. mile, inch, foot, yard, acre? acre
48. Which one is odd in the list… Loin, leopard, cow, tiger? cow
49. 64 32 16 8 4 2 _____? 1
50. Pakistan largest province by area? Balochistan
51. The ideal voltage source is one which ? when connected in a circuit supplies constant voltage whether the current changes or remains constant
52. The passive components used in electronic circuits are resistance, inductance and? capacitance
53. In a loop, the sum of all potential differences is equal to? the sum of individual currents
54. Fundamental property used in 1-node pair circuit analyzer is? voltage
55. If the potential of point A & B is Va and Vb then to find V(ab), we take _____ as a reference node? Node-A
56. The current source in parallel with equivalent resistance represents? Norton’s Theorem
57.  The active device is one which? supplies energy as well as converts energy from one form to another
58. The potential difference between two points in an electric circuit is? electric pressure
59. Oscilloscope is a ___________ measuring device? Voltage
60. In superposition theorem, all v-sources are replaced by………? Short circuit
61. By connecting a shunt of higher value in galvanometer what will decrease? Current sensitivity decreases
62. The relay is used in Transformer Protection? Bucholz
63. ____ is defined as the measure of the instrument by which it is error free? Answer: Accuracy
64. A _____ meter is used a null detector in Wheatstone bridge? Answer: Galvanometer
65.  _________is used for the measurement of Inductance? Hay bridge
66. ____ bridge used for the measurement of resistance? Wheatstone bridge
67. The wavelength of an EM wave after reflection at an angle on a surface? Increases in the actual direction of propagation
68. When the electric field is parallel to the plane of incidence, the electromagnetic wave is said to be? hyperbolically polarized
69. The EM field and current are concentrated close to the surface of the conductor. The phenomenon is called? Skin Effect
70. XH = J + D is? Maxwell equation
71. The voltages 66KV and 33KV are generally representing which part of the power system? Subtransmission voltages
72. The voltages greater than 230KV are known as? Extra high voltage
73. Delta source is considered to be less expensive because? It does not utilize neutral wire to earth
74. When fault on the power system is detected then? Circuit breaker opens
75. The overload protection uses the? Current Transformer
76. The fault occurs due to lightning and storms on the transmission line is? A line to Ground fault
77. Fault in the transmission line are ______ symmetrical? 5%
78. DIAC is a two terminal ? 4 layer device
79. In commercial analog, to digital converter, the output data is in the range of 6 bit up to? 32 bit
80. The class-A amplifier is used to achieve? High Linearity
81. The ripple frequency of bridge rectifier is? Twice the natural frequency
82. The class-A amplifier conducts for? 360 degrees
83. For measuring small resistance we use? Kelvin bridge
84. If R1 is the resistance of a coil of copper at t 0C° and RT is the resistance at T 0C° and also the resistance temperature coefficient of copper per degree centigrade at 0C° is 1/234.45, then Rt/RT? (234.45 + t) / (234.45 + T)
85. cos pi/4, the period is equal to? 8
86. The shunt winding of a motor has a resistance of 85 ohms at 22oC. When the motor runs at full load, its resistance increases to 100 ohms. The resistance temperature coefficient of winding per 0oC is 0.004. The rise in temperature of the winding will be near? 70oC
87. The one unit of energy will be charged if 20 watts bulb run for hours? 50
88. An alternator operating at unity power factor, the armature flux ___________ main flux? cross magnetizes
89. The LTI system is characterized by? Impulse input/response
90. Fourier series expansion has _____________ harmonically complex exponentials? Infinite
91. The product of RMS current and RMS voltage is called? Apparent power
92. The power consumed in the resistance of a circuit is? Active/Actual/Real power
93. The power which flows in the coil of reactance is? Reactive power
94. The reciprocal of the power factor is? Q-factor
95. Optical power is the power received due to______? light
96. When the RLC circuit is at resonance then? Power dissipation is maximum
97. The diversity factor is always? more than 1
98. Load factor is equal to? Average load/peak demand
99. Which of the following is not the part of Aeroderivative turbine? Fans
100. The transmission voltages are generally considered to be greater than? 110KV

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