CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY
Question Bank Solution
3 MARK --- QUESTION
4/5 MARK ----QUESTION
Course: DPMT
Semester: I Sem
Subject: Electrical & Electronics Engineering
1 Marks – Questions
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1. Unit of Voltage is _______
a) Ampere b) Voltage c) Ohms d) Watts
Ans: b) Voltage
2. Unit of resistance is ______
a) Ohms b) Amperes c) Volt d) Joules
Ans: a) Ohms
3. The resistance of conductor will increase as temperature increases (True/ False)
Ans: True
4. MMF in a magnetic circuit is equal to __________ in an electric circuit
a) Voltage drop b) Electric field c) EMF d) Potential difference
Ans: c) EMF
5. The unit of flux density is ________
a) N/m2 b) Wb/m2
c) Wb/m d) none of these
Ans: b) Wb/m2
6. In series circuit, the current through each of the components is not same (True/ False)
Ans: False
7. The frequency of power supply in India is _______
a) 25 HZ b) 50 HZ c) 60 HZ d) 40 HZ
Ans: b) 50 HZ
8. Form Factor for a Sine wave is______
a) 1.414 b) 0.707 c) 1.11 d) 0.637
Ans: c) 1.11
9. Resistance in Parallel is _____
a) 1/R1+1/R2 b) R1+R2 c) R1 X R2 d) None of these
Ans: a) 1/R1+1/R2
10. In a circuit ammeter is used to measure ________________
a) Voltage b) Current c) Power d) EMF
Ans: b) Current
11. Expand MMF _________
Ans: Magneto Motive Force
12. Watt meter is used to measure ______
a) Voltage b) Current c) Power d) EMF
Ans: c) Power
13. The power factor in capacitive circuit is _____________
a) Lagging b) Leading c) Unity d) Zero
Ans: b) Leading
14. The Tesla is the unit of __________.
a) Current b) Voltage c) Power d) Magnetic Flux
Ans: d) Magnetic Flux
15. The unit of frequency is_______
a) Hertz b) Ampere turn c) Power d) None of these
Ans: a) Hertz
16. Which material has extremely large resistance?
a) Conductor b) Insulator c) Semiconductor d) None of these
Ans: b) Insulator
17. Power factor in pure resistive load is ____________
a) Lagging b) Leading c) Unity d) Zero
Ans: c) Unity
18. Conductance is the reciprocal of _________
a) Resistance b) Capacitance c) Inductance d) None of these
Ans: a) Resistance
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
Ans: b) Time required to complete one cycle
20. The unit of flux is ____________
a) Ampere b) Weber c) Volts d) Ohm
Ans: b) Weber
21. A battery is a source of __________
a) DC Voltage b) 1-ϴ AC Voltage c) 3-ϴ AC Voltage d) None of these
Ans: a) DC Voltage
22. Inverter circuit converts _________________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
Ans: b) DC to AC
23. Generator is used to Convert Mechanical Energy into Electrical Energy (True/ False)
Ans: True
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
Ans: a) AC to DC
25. The back EMF in DC motor opposes the_____
a) Back EMF b) Magnetic flux c) Armature Voltage d) Supply Voltage
Ans: 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
Ans: b) 900
27. The EMF of DC Generator depends on its_________________
Ans: Speed
28. DC Generator converts Mechanical energy in to Electrical energy (True/ False)
Ans: True
29. DC Generator working on the principal of ____________
a) Faraday’s Law b) Kirchhoff’s Law c) Newton’s Law d) None of these
Ans: a) Faraday’s Law
30. The DC motor develops a ___________________
a) Force b) Torque c) Power d) Energy
Ans: b) Torque
31. When the speed at which a conductor is moved through a magnetic field is
increased, the induced voltage decreases (True/ False)
Ans: 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
Ans: a) V = Eb + la Ra
33. Starter is used to ______________________
a) Start the motor b) Limit high starting current c) Limit the voltage d) Rotate the rotor
Ans: b) Limit high starting current
34. Star/delta starter are used to start ____________ motor or above.
a) 7.5 HP b) 5 HP c) 3 HP d) 1HP
Ans: a) 7.5HP
35. Shunt motor is ___________motor
a) Constant speed b) Low speed c) High speed d) Over speed
Ans: a) Constant speed
36. Alternator is an _________________
a) DC Generator b) DC Motor c) AC Generator d) AC Motor
Ans: c) AC Generator
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
Ans: 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
Ans: a) up to 5 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
Ans: 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
Ans: 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
Ans: b) Frequency
42. Transformer works on ___________ induction
a) Mutual b) Dynamic c) Static d) None of these
Ans: a) Mutual
43. Transformer is rated in ______________
a) KVAR b) KVA c) KW d) All of these
Ans: b) KVA
44. Transformer is circuit which converts _____________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
Ans: d) AC to AC
45. Step-up Transformer decreases the voltage (true/ False)
Ans: False
46. Transformer Losses are ___________ losses
a) Mechanical b) Core & Copper c) Voltage d) None of these
Ans: b) Core & Copper
47. Current & Voltage Transformer are used as a _____________ Transformer
a) Machine b) Instrument c) Tool d) All of these
Ans: b) Instrument
48. Step down transformer _________ the voltage
a) Increases b) Decreases c) No change d) None of these
Ans: b) Decreases
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
Ans: b) Increases
50. Three phase induction motor is not self-starting (True/ False)
Ans: 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
Ans: b) Rotating
52. A common method of cooling a power transformer is
a) Natural cooling b) Air blasting cooling c) Oil cooling d) Any of these
Ans: c) Oil cooling
53. Material used for construction of transformer core is usually
a) Wood b) Copper c) Aluminium d) Silicon steel
Ans: d) Silicon steel
54. A Transformer oil must be free from
a) Sludge b) Odour c) Gases d) Moisture
Ans: 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
Ans: b) Sandwich type
56. Efficiency of a power transformer is of the order
a) 100% b) 98% c) 50% d) 25%
Ans: b) 98%
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
Ans: a) 0.4 mm to 0.5 mm
58. A universal motor can run on
a) AC only b) DC only c) Either AC or DC d) None of these
Ans: c) Either AC or DC
59. The frame of an induction motor is usually made up of
a) Silicon steel b) Cast iron c) Aluminium d) bronze
Ans: b) Cast iron
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%
Ans: b) 80 to 90%
61. The Megger is used to measure ____________
a) Internal resistance b) Capacitance c) Power d) Impedance
Ans: a) Internal resistance
62. Expand MCCB ___________
Ans: Molded Case Circuit Breaker
63. Power dissipation in an ideal inductor is ______________
a) Maximum b) Minimum c) Zero d) Infinity
Ans: c) Zero
64. Rectifier coverts DC to AC (True / False)
Ans: False
65. A person usually offers the most resistance to electricity? (True/ False)
Ans: False
66. _______ Elements serve as protection against overload.
a) Switch b) Fuse c) Resistor d) Relay
Ans: b) Fuse
67. Which of the following are the passive elements _______
a) Capacitors b) Resistors c) Inductors d) All of these
Ans: 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
Ans: b) High, Low
69. Fuse in motor circuit provides______
a) Over current protection b) Short circuit protection
c) Open circuit protection d) None of these
Ans: b) Short circuit protection
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
Ans: d) Any of these
71. Earth wire or ground wire is made of:
a) Copper b) Aluminium c) Iron d) Galvanized steel
Ans: 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
Ans: b) Decreases
73. Earth pit value resistance is measures in which type of meter
a) Insulation megger b) Voltmeter c) Earth megger d) Ammeter
Ans: c) Earth megger
74. Expand UPS ___________
Ans: Un-interruptible Power Supply
75. MCB is used in circuits for Overload protection (True or False)
Ans: True
76. We can improve the earth resistance by packing common salt charcoal & water. (True or
False)
Ans: True
77. _________ is the good conductor of electricity
Ans: Copper
78. Expand L.T.U.G _____________
Ans: Low Tension Under Ground
79. Which type fire extinguisher is used for electrical fire?
a) Water b) Co2 & dry powder c) Foam d) None of these
Ans: b) Co2 & dry powder
80. The voltage of 11 KV supply is _______
Ans: 11000V
81. A semiconductor in its purest form is called _____________ semiconductor
a) Pure b) Doped c) Intrinsic d) Extrinsic
Ans: c) Intrinsic
82. Volatile memory is ________________
a) ROM b) EPROM c) RAM d) EEPROM
Ans: c) RAM
83. SCR means ________________
Ans: Silicon Controlled Rectifier
84. Holes are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
Ans: a) P-Type
85. Electrons are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
Ans: b) N-Type
86. An extrinsic semiconductor is a _________________
a) Doped semiconductor b) Pure semiconductor c) Good insulator
d) Good conductor
Ans: a) Doped semiconductor
87. NOT gate has
a) One input b) Two inputs c) Three Inputs d) Four Inputs
Ans: a) One input
88. NOT of AND gate is called
a) NAND gate b) OR Gate c) NOR gate d) XOR gate
Ans: a) NAND 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
Ans: c) Truth table
90. AND gate can be used as
a) Electronic switch b) Amplifier c) Summer d) Integrator
Ans: a) Electronic switch
91. A basic OR gate consists of
a) One input b) Two inputs c) Three Inputs d) Four Inputs
Ans: b) Two inputs
92. In case of pure insulators, covalent band is
a) Filled b) Empty c) Semi filled d) None of these
Ans: b) Empty
93. Atoms consist of electrons, protons and
a) Photons b) Diodes c) Neutrons d) Cells
Ans: c) Neutrons
94. Silicon and Germanium are______
a) Conductors b) Semiconductors c) Insulators d) Super conductors
Ans: b) Semiconductors
95. Narrow energy gap is present in
a) Conductors b) Semiconductors c) Insulators d) Super conductors
Ans: b) Semiconductors
96. In metals, conductivity takes place due to
a) Free electrons b) Holes b) Valence electrons d) Photons
Ans: a) Free electrons
97. Diode has________ no. of terminals
a) Two b) Three c) Four d) Five
Ans: a) Two
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
Ans: c) NOR gate
100. Multiplication symbol 'x' is representation of
a) AND b) OR c) NAND d) NOT
Ans: a) AND
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