CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY
Question Bank
3 MARK --- QUESTION
4/5 MARK ----QUESTION
Course: DPMT
Semester: I Sem
Subject: Electrical & Electronics Engineering
1 mark – questions (MCQ)
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1. Unit of Voltage is _______
a) Ampere b) Voltage c) Ohms d) Watts
2. Unit of resistance is ______
a) Ohms b) Amperes c) Volt d) Joules
3. The resistance of conductor will increase as temperature increases
(True/ False)
4. MMF in a magnetic circuit is equal to __________ in an electric circuit
a) Voltage drop b) Electric field c) EMF d) Potential difference
5. The unit of flux density is ________
a) N/m2 b) Wb/m2
c) Wb/m d) none of these
6. In series circuit, the current through each of the components is not
same (True/ False)
7. The frequency of power supply in India is _______
a) 25 HZ b) 50 HZ c) 60 HZ d) 40 HZ
8. Form Factor for a Sine wave is______
a) 1.414 b) 0.707 c) 1.11 d) 0.637
9. Resistance in Parallel is _____
a) 1/R1+1/R2 b) R1+R2 c) R1 X R2 d) None of these
10. In a circuit ammeter is used to measure ________________
a) Voltage b) Current c) Power d) EMF
11. Expand MMF _________
12. Watt meter is used to measure ______
a) Voltage b) Current c) Power d) EMF
13. The power factor in capacitive circuit is _____________
a) Lagging b) Leading c) Unity d) Zero
14. The Tesla is the unit of __________.
a) Current b) Voltage c) Power d) Magnetic Flux
15. The unit of frequency is_______
a) Hertz b) Ampere turn c) Power d) None of these
16. Which material has extremely large resistance?
a) Conductor b) Insulator c) Semiconductor d) None of these
17. Power factor in pure resistive load is ____________
a) Lagging b) Leading c) Unity d) Zero
18. Conductance is the reciprocal of _________
a) Resistance b) Capacitance c) Inductance d) None of these
19. The period of a wave is ______
a) The same as frequency b) Time required to complete one cycle
c) Expressed in amperes d) None of
these
20. The unit of flux is ____________
a) Ampere b) Weber c) Volts d) Ohm
21. A battery is a source of __________
a) DC Voltage b) 1-ϴ AC Voltage c) 3-ϴ AC Voltage d) None of these
22. Inverter circuit converts _________________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
23. Generator is used to Convert Mechanical Energy into Electrical Energy
(True/ False)
24. The function of commutator in a DC generator is to convert
_____________
a) AC to DC b) AC to AC c) DC to DC d) DC to AC
25. The back EMF in DC motor opposes the_____
a) Back EMF b) Magnetic flux c) Armature Voltage d) Supply Voltage
26. In a DC machine, the angle between the stator and rotor field is
_______________
a) 600
b) 900
c) 1200
d) 1800
27. The EMF of DC Generator depends on its_________________
28. DC Generator converts Mechanical energy in to Electrical energy (True/
False)
29. DC Generator working on the principal of ____________
a) Faraday’s Law b) Kirchhoff’s Law c) Newton’s Law d) None of these
30. The DC motor develops a ___________________
a) Force b) Torque c) Power d) Energy
31. When the speed at which a conductor is moved through a magnetic field
is
increased, the induced voltage decreases (True/ False)
32. Voltage equation of a DC motor is __________
a) V = Eb + la Ra b) Eb = V + la Ra c) V = Eb/la Ra d) V = Eb + la 2Ra
33. Starter is used to ______________________
a) Start the motor b) Limit high starting current c) Limit the voltage d)
Rotate the rotor
34. Star/delta starter are used to start ____________ motor or above.
a) 7.5 HP b) 5 HP c) 3 HP d) 1HP
35. Shunt motor is ___________motor
a) Constant speed b) Low speed c) High speed d) Over speed
36. Alternator is an _________________
a) DC Generator b) DC Motor c) AC Generator d) AC Motor
37. Three point starter can be used for
a) Series motor only b) Shunt motor only
c) Compound motor only d) Both Shunt & Compound motor
38. A direct on line starter is used for starting motors
a) up to 5 HP b) up to 10 HP c) up to 15 HP d) up to 20 HP
39. Which DC motor has got maximum self loading property?
a) Series motor b) shunt motor c) Cumulatively compound motor
d) Differentially compound motor
40. In a DC Generator, the iron losses mainly takes place in ______
a) Yoke b) Commutator c) Armature conductors d) Armature core
41. Transformer is an electrical device for transferring electrical energy
from one circuit to another
circuit without changing __________
a) Voltage b) Frequency c) Power d) None of these
42. Transformer works
on ___________ induction
a) Mutual b) Dynamic c) Static d) None of these
43. Transformer is rated in ______________
a) KVAR b) KVA c) KW d) All of these
44. Transformer is circuit which converts _____________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
45. Step-up Transformer decreases the voltage (true/ False)
46. Transformer Losses are ___________ losses
a) Mechanical b) Core & Copper c) Voltage d) None of these
47. Current & Voltage Transformer are used as a _____________
Transformer
a) Machine b) Instrument c) Tool d) All of these
48. Step down transformer _________ the voltage
a) Increases b) Decreases c) No change d) None of these
49. If the frequency of input power to an induction motor increases, the
rotor copper loss
a) Decreases b) Increases c) Remains the same d) None of these
50. Three phase induction motor is not self-starting (True/ False)
51. The principal of operation of a single phase induction motor depends
upon
_________magnetic field
a) Pulsating b) Rotating c) Static d) All of these
52. A common method of
cooling a power transformer is
a) Natural cooling b) Air blasting cooling c) Oil cooling d) Any of these
53. Material used for construction of transformer core is usually
a) Wood b) Copper c) Aluminium d) Silicon steel
54. A Transformer oil must be free from
a) Sludge b) Odour c) Gases d) Moisture
55. Which type of winding is used in 3-phase shell-type transformer
a) Circular type b) Sandwich type c) Cylindrical type d) Rectangular type
56. Efficiency of a power transformer is of the order
a) 100% b) 98% c) 50% d) 25%
57. The thickness of laminations used in a transformer is usually
a) 0.4 mm to 0.5 mm b) 4 mm to 5 mm c) 14 mm to 15 mm d) 10 mm to 12 mm
58. A universal motor can run on
a) AC only b) DC only c) Either AC or DC d) None of these
59. The frame of an induction motor is usually made up of
a) Silicon steel b) Cast iron c) Aluminium d) bronze
60. The efficiency of an induction motor can be expected to be nearly
a) 60 to 90% b) 80 to 90% c) 95 to 99% d) 99%
61. The Megger is used to measure ____________
a) Internal resistance b) Capacitance c) Power d) Impedance
62. Expand MCCB ___________
63. Power dissipation in an ideal inductor is ______________
a) Maximum b) Minimum c) Zero d) Infinity
64. Rectifier coverts DC to AC (True / False)
65. A person usually offers the most resistance to electricity? (True/
False)
66. _______ Elements serve as protection against overload.
a) Switch b) Fuse c) Resistor d) Relay
67. Which of the following are the passive elements _______
a) Capacitors b) Resistors c) Inductors d) All of these
68. A fuse wire should be of material that has _________ resistivity &
_______ melting point
a) High, High b) High, Low c) Low, Low d) None of these
69. Fuse in motor circuit provides______
a) Over current protection b) Short circuit protection
c) Open circuit protection d) None of these
70. Which of the following protective devices can be used against lightning
surges?
a) Horn gap b) Surge diverters c) Lightning arresters d) Any of these
71. Earth wire or ground wire is made of:
a) Copper b) Aluminium c) Iron d) Galvanized steel
72. Moisture content in the soil __________ the earth soil resistance:
a) Increases b) Decreases c) Does not affect d) None of these
73. Earth pit value resistance is measures in which type of meter
a) Insulation megger b) Voltmeter c) Earth megger d) Ammeter
74. Expand UPS ___________
75. MCB is used in circuits for Overload protection (True or False)
76. We can improve the earth resistance by packing common salt charcoal
& water. (True or
False)
77. _________ is the
good conductor of electricity
78. Expand L.T.U.G _____________
79. Which type fire extinguisher is used for electrical fire?
a) Water b) Co2 & dry powder c) Foam d) None of these
80. The voltage of 11 KV supply is _______
81. A semiconductor in its purest form is called _____________
semiconductor
a) Pure b) Doped c) Intrinsic d) Extrinsic
82. Volatile memory is ________________
a) ROM b) EPROM c) RAM d) EEPROM
83. SCR means ________________
84. Holes are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
85. Electrons are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
86. An extrinsic semiconductor is a _________________
a) Doped semiconductor b) Pure semiconductor c) Good insulator
d) Good conductor
87. NOT gate has
a) One input b) Two inputs c) Three Inputs d) Four Inputs
88. NOT of AND gate is called
a) NAND gate b) OR Gate c) NOR gate d) XOR gate
89. Table which is a tabulation of all possible inputs and resulting
outputs is referred to as
a) Truth Logic b) Logic signal c) Truth table d) Multiple table
90. AND gate can be used as
a) Electronic switch b) Amplifier c) Summer d) Integrator
91. A basic OR gate consists of
a) One input b) Two inputs c) Three Inputs d) Four Inputs
92. In case of pure insulators, covalent band is
a) Filled b) Empty c) Semi filled d) None of these
93. Atoms consist of electrons, protons and
a) Photons b) Diodes c) Neutrons d) Cells
94. Silicon and Germanium are______
a) Conductors b) Semiconductors c) Insulators d) Super conductors
95. Narrow energy gap is present in
a) Conductors b) Semiconductors c) Insulators d) Super conductors
96. In metals, conductivity takes place due to
a) Free electrons b) Holes b) Valence electrons d) Photons
97. Diode has________ no. of terminals
a) Two b) Three c) Four d) Five
98. BJT Means____________
Ans: Bipolar Junction Transistor
99. NOT of OR gate is called
a) NAND gate b) OR Gate c) NOR gate d) XOR gate
100. Multiplication symbol 'x' is representation of
a) AND b) OR c) NAND d) NOT
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