CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY
Question bank
3 MARK --- QUESTION
4/5 MARK ----QUESTION
COURSE : DPT
SEMESTER: II
SUBJECT : Electrical And Electronics Engineering
1 MARK—QUESTION
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1. Unit of current is______
a) Ampere b) Voltage c) Ohms d) Watts
2. Unit of Voltage is _______
a) Ampere b) Volts c) Ohms d) Watts
3. Unit of resistance is ______
a) Ohms b) Amperes c) Volt d) Joules
4. According to ohm's law, V = ________
a) IR b) I2 R c) I/R d) IR2
5. Conductance is the reciprocal of ________
a) Resistance b) Capacitance c) Inductance d) Resistivity
6. Resistances in parallel ______
a) 1/R1+1/R2 b) R1+R2 c) R1xR2 d) None of these
7. Kirchhoff's second law is based on law of conservation of ____________
a) Chargeb) Energyc) Momentumd) Mass
8. The frequency of DC supply is_________
a) Zero Hz b) 16 Hz c) 50 Hz d) 100 Hz.
9. The frequency of power supply in India is _______
a) 25 HZ b) 60 HZ c) 55 HZ d) 50 HZ
10. Form Factor for a Sine wave is______
a) 1.414 b) 0.707 c) 1.11 d) 0.637
11. The Tesla is the unit of __________.
a) Current b) Voltage c) Power d) Magnetic Flux
12. A battery is a source of __________
a) DC Voltage b) 1-ϴ AC Voltage c) 3-ϴ AC Voltage d) None of these
13. Inverter circuit converts _________________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
14. 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
15. 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
16. Starter is used to ___________
a) Start the motor b) Limit high starting current c) Limit the voltage d) Rotate the rotor
17. Alternator is an_________
a) DC Generator b) DC Motor c) AC Generator d) AC Motor
18. Three point starter can be used for____________
a) Series motor only b) Shunt motor only c) Compound motor only d) Both Shunt & Compound motor
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 DC motor develops a ____________
a) Force b) Torque c) Power d) Energy
21. 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
22. Transformer works on ___________ induction
a) Mutual b) Dynamic c) Static d) None of these
23. Transformer is circuit which converts __________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
24. Material used for construction of transformer core is usually___________
a) Wood b) Copper c) Aluminum d) Silicon steel
25. Efficiency of a power transformer is of the order___________
a) 100% b) 98% c) 50% d) 25%
26. The Megger is used to measure ____________
a) Internal resistance b) Capacitance c) Power d) Impedance
27. _______ Elements serve as protection against overload.
a) Switch b) Fuse c) Resistor d) Relay
28. Fuse in motor circuit provides______
a) Over current protection b) Short circuit protection
c) Open circuit protection d) None of these
29. 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
30. Earth wire or ground wire is made of:_________
a) Copper b) Aluminum c) Iron d) Galvanized steel
31. In a circuit ammeter is used to measure ________________
a) Current b) EMF c) Voltage d) Power
32. MMF in a magnetic circuit is equal to __________ in an electric circuit
a) Voltage drop b) Electric field c) EMF d) Potential difference
33. What is meant by flow of electrons?
a) insulator b) electric current c) semiconductor d) voltage
34. A DC motor with field has ___________ number of carbon brushes
a) 1 b) 2 c) 3 d) 4
35. DC Generator working on the principal of ____________
a) Kirchhoff law b) Faraday's law c) Flemings law d) Newton’s law
36. Transformer Losses are ___________ losses
a) power b) voltage c) iron & copper d) none of these
37. Steel stamping is used in Transformer for reducing the ____________
a) power b) voltage c) current d) losses
38. In Transformer the secondary winding is connected to a ___________.
a) ac source b) dc source c) load d) all of these
39. A common method of cooling a power transformer is__________
a) Natural cooling b) Air blasting cooling c) Oil cooling d) Any of these
40. Holes are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
41. Electrons are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
42. Which type fire extinguisher is used for electrical fire?
a) Water b) Co2 & dry powder c) Foam d) None of these
43. NOT gate has_________
a) One input b) Two inputs c) Three Inputs d) Four Inputs
44. AND gate can be used as __________
a) Electronic switch b) Amplifier c) Summer d) Integrator
45. Silicon and Germanium are______
a) Conductors b) Semiconductors c) Insulators d) Super conductors
46. An extrinsic semiconductor is a ____________________.
a) Doped Semiconductor
b) Pure Semiconductor
c) Good Insulator
d) Good Conductor
47. Silicon that has been doped with a trivalent impurity is called ______________.
a) P-type Semiconductor
b) N-type Semiconductor
c) Intrinsic Semiconductor
d) Extrinsic Semiconductor
48. Silicon that has been doped with a pentavalent impurity is called_________
a) P-type Semiconductor
b) N-type Semiconductor
c) Intrinsic Semiconductor
d) Extrinsic Semiconductor
49. The number of depletion layers in a transistor is __________
a) four
b) three
c) one
d) two
50. In a three phase, delta connection ——-
a) Line current is equal to phase current b) Line voltage is equal to phase voltage
c) None of the above d) Line voltage and line current is zero
51. In a three phase AC circuit, the sum of all three generated voltages is ————
a) Infinite b) Zero c) One d) None of the above
52. Which of the following is usually not the generating voltage ?
a) 6.6 kV
b) 9.9 kV
c) 11kV
d) 13.2 kV.
53. Boosters are basically___________
a) Inductors
b) Capacitors
c) Transformers
d) Synchronous motors.
54. Skin effect depends on__________
a) Size of the conductor
b) Frequency of the current
c) Resistivity of the conductor material
d) all of the above.
55. In a transistor highly doped part is___________
a)Emitter b)Base c)Collector d)None of the above
56. For a silicon P-N junction, the barrier potential is about_________
a)0.7 V b) 0.8 V c)0.9 V d)1.0 V
57.In a three-phase system, when the loads are perfectly balanced, the neutral current is_________
a) zero b) one-third of maximum c) two-thirds of maximum d) at maximum
58. The disadvantage of a half-wave rectifier is that the_________
a) Components are expensive b) diodes must have a higher power rating
c) Output is difficult to filter d) none of the above
59. The maximum efficiency of a half-wave rectifier is____________
a)40.6% b) 81.2% c) 50% d) 25%
60. A transistor has___________
a)one pn junction b) two pn junctions c) three pn junctions d) four pn junctions
61. Which domestic utility item has highest power rating?
a) Refrigerator b) Ceiling fan c) Tube light d) Electric iron
62. The power factor of a purely resistive circuit is _________
a) Zero b) Unity c) Lagging d) Leading
63. The relation between frequency, speed and number of poles is given by_________
a) Ns = 120x f/ p b) F = 120x Ns /p
c) Ns = 120x p /f d) Ns = f x p/ 120
64. The relationship between the frequency of ac wave and the time period is given by ________
a)f = T b) f = 1 / T2 c) f = 1 / T d) f = T2
65.Which of the following is not an electrical quantity?
a)Voltage b) Wavelength c) Power d) Current
66. Amplitude is the maximum value of which of the following?
a)power b) current c) resistance d) none of these
67. Resistance limits the ______
a)voltage b) power c) current d) material
68.The capacity of a battery or accumulator is given by ______________
a) Power b) Ampere-hour rating c) Voltage rating d) Current rating.
69.A sudden short-circuit in an AC system causes a rise in _________ in the short-circuited phase.
a)current b) temperature c) voltage d) none of these
70.In DC generator EMF is __________ then the terminal voltage.
a) Less then b) greater then c) zeros d) 230v
71.Watt meter is used to measure ______
a) Power b) Current c) Voltage d) EMF
72.Current is reduced _____________ times in star/delta starter
a)3 times b) 6 times c) Root 3 times d) 4 times
73.SCR means ________________
a) Silicon Controlled Reactor
b) Semiconductor Controlled Rectifier
c) Silicon Controlled Rectifier
d) none of these
74.The load of a consumer is generally measured in terms of ___________
a) Volts
b) Amperes
c) Ampere hour
d) kW
75.The unit of energy is ____________.
a) KW
b) kWh
c) HP
d) KVA
76. Capacitor does not allow sudden change of _____
77. Diode is a _______terminal device.
78. The element that is bigger size in transistor is _____
79.NOT gate is also known as ____
80. Static Capacitors are used for ______
81. A circuit breaker is a ______
82. The load of a consumer is generally measured in terms of ___
83. A capacitive load always has a ____ power factor.
84. An Inductive load has a power factor.
85. In ceiling fans generally motors are used.
86.The total number of magnetic field lines passing through an area is termed as______
87. Reciprocal of reluctance is ______
88. Expression for the form factor
89. ________ occurs in a transformer when some of the primary flux lines pass through the air instead of
the core.
90. A(n) _______ transformer is usually used for audio or power applications.
91. is the ability of a material to remain magnetized after removal of the magnetizing force.
92. A two-diode rectifier will not operate without a____
93. An electron can move to another atom's orbit only while in the _______
94.Average power taken by the pure capacitor is _____
95.The thickness of laminations used in a transformer is usually _______
96._______is the good conductor of electricity.
97.Multiplication symbol 'x' is representation of ______
98.The EMF of DC Generator depends on its _________
Ans:speed.
99. The base-to-emitter voltage of a transistor in the "on" state is _______
100. One eV is equal to _________
101. The resistance of conductor will increase as temperature increases. Say (True/ False)
102. In series circuit, the current through each of the components is not same. Say (True/ False)
103. Generator is used to Convert Mechanical Energy into Electrical Energy. Say (True/ False)
104. The watt is the unit of power. Say (True/ False)
105. Step-up Transformer decreases the voltage. Say (True/ False)
106. Three phase induction motor is not self-starting. Say (True/ False)
107. Rectifier coverts DC to AC.Say (True / False)
108. A person usually offers the most resistance to electricity? Say(True/ False)
109. MCB is used in circuits for Overload protection .Say(True / False)
110. We can improve the earth resistance by packing common salt, charcoal & water. Say (True / False)
111. Resistance limits the current. Say (True / False)
112. Transformer is a dynamic device. Say (True / False)
113. Step-up transformer decreases the voltage. Say (True / False)
114. Step-up transformer increases the voltage. Say (True / False)
115. A Motor is used to convert Electrical energy into mechanical energy. Say (True or False)
116. The output of a NAND gate is the same as the inverted output of an AND gate. Say (True / False)
117. The output of an exclusive-OR (XOR) gate is 1 only when the inputs are different. Say (True / False)
118. In a BJT, the collector current is approximately equal to the base current. Say (True / False)
119. A bipolar transistor has three leads: the base, collector, and emitter. Say (True / False)
120. A rectifier can change ac voltage to dc voltage. Say (True /False)
121. Breakdown voltage and peak inverse voltage are the same. Say (True / False)
122. An open circuit is one that has a complete current path. Say (True / False)
123. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage. Say (True / False)
124. A balanced load is one in which all the impedances are equal. Say (True / False)
125. Amplitude is the maximum value of a voltage or current. Say (True / False)
126.Expand MMF _________
127. Expand MCCB ___________
128. Expand UPS ________
129. Expand L.T.U.G ________
130. SCR means __________
131. BJT Means________
132.Expand VT_______
133. Expand RMS ________
134. Expand PT_____
135. Expand NC_______
136. Expand MCB______
137. Expand KVA______
138. Expand HZ____
139. Expand DC ________
140. Expand CT________
141. Expand ATC______
142. Expand AC_____
143. Expand CFL _____
144. Expand kW _____
145. Expand HF _____
146. Expand NC_____
147. Expand ANSI_______
148. Expand LED_____
149. Expand EMF _______
150. Expand NER_______Ans: Neutral earth resistor
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