CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY
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
Ans: a) Ampere
2. Unit of Voltage is _______
a) Ampere b) Volts c) Ohms d) Watts
Ans: b) Volts
3. Unit of resistance is ______
a) Ohms b) Amperes c) Volt d) Joules
Ans: a) Ohms
4. According to ohm's law, V = ________
a) IR b) I2 R c) I/R d) IR2
Ans: a) IR
5. Conductance is the reciprocal of ________
a) Resistance b) Capacitance c) Inductance d) Resistivity
Ans: a) Resistance
6. Resistances in parallel ______
a) 1/R1+1/R2 b) R1+R2 c) R1xR2 d) None of these
Ans: a) 1/R1+1/R2
7. Kirchhoff's second law is based on law of conservation of ____________
a) Chargeb) Energyc) Momentumd) Mass
Ans: b) Energy
8. The frequency of DC supply is_________
a) Zero Hz b) 16 Hz c) 50 Hz d) 100 Hz.
Ans: a) Zero Hz
9. The frequency of power supply in India is _______
a) 25 HZ b) 60 HZ c) 55 HZ d) 50 HZ
Ans: d) 50 HZ
10. Form Factor for a Sine wave is______
a) 1.414 b) 0.707 c) 1.11 d) 0.637
Ans: c) 1.11
11. The Tesla is the unit of __________.
a) Current b) Voltage c) Power d) Magnetic Flux
Ans: 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
Ans: a) DC Voltage
13. Inverter circuit converts _________________
a) AC to DC b) DC to AC c) DC to DC d) AC to AC
Ans: b) DC 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
Ans: a) AC to DC
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
Ans: a) V = Eb + la Ra
16. 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
17. Alternator is an_________
a) DC Generator b) DC Motor c) AC Generator d) AC Motor
Ans: c) AC Generator
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
Ans: 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
Ans: b) Time required to complete one cycle
20. The DC motor develops a ____________
a) Force b) Torque c) Power d) Energy
Ans: b) Torque
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
Ans: b) Frequency
22. Transformer works on ___________ induction
a) Mutual b) Dynamic c) Static d) None of these
Ans: a) Mutual
23. 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
24. Material used for construction of transformer core is usually___________
a) Wood b) Copper c) Aluminum d) Silicon steel
Ans: d) Silicon steel
25. Efficiency of a power transformer is of the order___________
a) 100% b) 98% c) 50% d) 25%
Ans: b) 98%
26. The Megger is used to measure ____________
a) Internal resistance b) Capacitance c) Power d) Impedance
Ans: a) Internal resistance
27. _______ Elements serve as protection against overload.
a) Switch b) Fuse c) Resistor d) Relay
Ans: b) Fuse
28. 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
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
Ans: d) Any of these
30. Earth wire or ground wire is made of:_________
a) Copper b) Aluminum c) Iron d) Galvanized steel
Ans: d) Galvanized steel
31. In a circuit ammeter is used to measure ________________
a) Current b) EMF c) Voltage d) Power
Ans: a) Current
32. 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
33. What is meant by flow of electrons?
a) insulator b) electric current c) semiconductor d) voltage
Ans: b) Electric current
34. A DC motor with field has ___________ number of carbon brushes
a) 1 b) 2 c) 3 d) 4
Ans: b) 2
35. DC Generator working on the principal of ____________
a) Kirchhoff law b) Faraday's law c) Flemings law d) Newton’s law
Ans: b) Faraday's law
36. Transformer Losses are ___________ losses
a) power b) voltage c) iron & copper d) none of these
Ans: c) iron & copper
37. Steel stamping is used in Transformer for reducing the ____________
a) power b) voltage c) current d) losses
Ans: d) losses
38. In Transformer the secondary winding is connected to a ___________.
a) ac source b) dc source c) load d) all of these
Ans: b) load
39. 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
40. Holes are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
Ans: a) P-Type
41. Electrons are the majority carrier in ____________ semiconductor
a) P-Type b) N-Type c) Diode d) None of these
Ans: b) N-Type
42. 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
43. NOT gate has_________
a) One input b) Two inputs c) Three Inputs d) Four Inputs
Ans: a) One input
44. AND gate can be used as __________
a) Electronic switch b) Amplifier c) Summer d) Integrator
Ans: a) Electronic switch
45. Silicon and Germanium are______
a) Conductors b) Semiconductors c) Insulators d) Super conductors
Ans: b) Semiconductors
46. An extrinsic semiconductor is a ____________________.
a) Doped Semiconductor
b) Pure Semiconductor
c) Good Insulator
d) Good Conductor
Ans: a) Doped Semiconductor
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
Ans: a) P- type 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
Ans: b) N-type Semiconductor
49. The number of depletion layers in a transistor is __________
a) four
b) three
c) one
d) two
Ans: 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
Ans: b) Line voltage is equal to phase voltage
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
Ans: b)Zero
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.
Ans: b) 9.9 kV
53. Boosters are basically___________
a) Inductors
b) Capacitors
c) Transformers
d) Synchronous motors.
Ans: c) transformers
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.
Ans: d) all of the above
55. In a transistor highly doped part is___________
a)Emitter b)Base c)Collector d)None of the above
Ans: a)Emitter
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
Ans: a) 0.7V
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
Ans: a) zero
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
Ans: c) output is difficult to filter
59. The maximum efficiency of a half-wave rectifier is____________
a)40.6% b) 81.2% c) 50% d) 25%
Ans: a) 40.6%
60. A transistor has___________
a)one pn junction b) two pn junctions c) three pn junctions d) four pn junctions
Ans: b) two pn junctions
61. Which domestic utility item has highest power rating?
a) Refrigerator b) Ceiling fan c) Tube light d) Electric iron
Answer: d) Electric iron
62. The power factor of a purely resistive circuit is _________
a) Zero b) Unity c) Lagging d) Leading
Ans: b) Unity
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
Ans: a) Ns = 120 x f/p
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
Ans: c) f = 1 / T
65.Which of the following is not an electrical quantity?
a)Voltage b) Wavelength c) Power d) Current
Ans: b) Wavelength
66. Amplitude is the maximum value of which of the following?
a)power b) current c) resistance d) none of these
Ans: b) current
67. Resistance limits the ______
a)voltage b) power c) current d) material
Ans: c) current
68.The capacity of a battery or accumulator is given by ______________
a) Power b) Ampere-hour rating c) Voltage rating d) Current rating.
Ans: b) Ampere-hour 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
Ans: a) current
70.In DC generator EMF is __________ then the terminal voltag
a) Less then b) greater then c) zeros d) 230v
Ans: b) greater then
71.Watt meter is used to measure ______
a) Power b) Current c) Voltage d) EMF
Ans: a) Power
72.Current is reduced _____________ times in star/delta starter
a)3 times b) 6 times c) Root 3 times d) 4 times
Ans: c) Root 3 times
73.SCR means ________________
a) Silicon Controlled Reactor
b) Semiconductor Controlled Rectifier
c) Silicon Controlled Rectifier
d) none of these
Ans: c) Silicon Controlled Rectifier
74.The load of a consumer is generally measured in terms of ___________
a) Volts
b) Amperes
c) Ampere hour
d) kW
Ans: d) kW
75.The unit of energy is ____________.
a) KW
b) kWh
c) HP
d) KVA
Ans: b) kWh
76. Capacitor does not allow sudden change of _____
Ans:current
77. Diode is a _______terminal device.
Ans: two
78. The element that is bigger size in transistor is _____
Ans:collector
79.NOT gate is also known as ____
Ans: inverter
80. Static Capacitors are used for ______
Ans: power factor improvement
81. A circuit breaker is a ______
Ans:current interrupting device.
82. The load of a consumer is generally measured in terms of ___
Ans: kW (kilo-watt)
83. A capacitive load always has a ____ power factor.
Ans: leading
84. An Inductive load has a power factor.
Ans:lagging
85. In ceiling fans generally motors are used.
Ans: leading
86.The total number of magnetic field lines passing through an area is termed as______
Ans: magnetic flux
87. Reciprocal of reluctance is ______
Ans:Permeance
88. Expression for the form factor
Ans:Irms / Iav
89. ________ occurs in a transformer when some of the primary flux lines pass through the air instead of
the core.
Ans: Magnetic flux leakage
90. A(n) _______ transformer is usually used for audio or power applications.
Ans:iron-core
91. is the ability of a material to remain magnetized after removal of the magnetizing force.
Ans:Retentivity
92. A two-diode rectifier will not operate without a____
Ans: center-tapped transformer
93. An electron can move to another atom's orbit only while in the _______
Ans: conduction band.
94.Average power taken by the pure capacitor is _____
Ans: zero.
95.The thickness of laminations used in a transformer is usually _______
Ans:0.4 mm to 0.5 mm.
96._______is the good conductor of electricity.
Ans: Copper
97.Multiplication symbol 'x' is representation of ______
Ans:AND gate.
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 _______
Ans: 0.7v.
100. One eV is equal to _________
Ans: 1.6 × 10–19
J.
101. The resistance of conductor will increase as temperature increases. Say (True/ False)
Ans: True
102. In series circuit, the current through each of the components is not same. Say (True/ False)
Ans: False
103. Generator is used to Convert Mechanical Energy into Electrical Energy. Say (True/ False)
Ans: True
104. The watt is the unit of power. Say (True/ False)
Ans: True
105. Step-up Transformer decreases the voltage. Say (True/ False)
Ans: False
106. Three phase induction motor is not self-starting. Say (True/ False)
Ans: False
107. Rectifier coverts DC to AC.Say (True / False)
Ans: False
108. A person usually offers the most resistance to electricity? Say(True/ False)
Ans: False
109. MCB is used in circuits for Overload protection .Say(True / False)
Ans: True
110. We can improve the earth resistance by packing common salt, charcoal & water. Say (True / False)
Ans: True
111. Resistance limits the current. Say (True / False)
Ans: True
112. Transformer is a dynamic device. Say (True / False)
Ans: False
113. Step-up transformer decreases the voltage. Say (True / False)
Ans: False
114. Step-up transformer increases the voltage. Say (True / False)
Ans: True
115. A Motor is used to convert Electrical energy into mechanical energy. Say (True or False)
Ans: True
116. The output of a NAND gate is the same as the inverted output of an AND gate. Say (True / False)
Ans: True
117. The output of an exclusive-OR (XOR) gate is 1 only when the inputs are different. Say (True / False)
Ans: True
118. In a BJT, the collector current is approximately equal to the base current. Say (True / False)
Ans: False
119. A bipolar transistor has three leads: the base, collector, and emitter. Say (True / False)
Ans: True
120. A rectifier can change ac voltage to dc voltage. Say (True /False)
Ans: True
121. Breakdown voltage and peak inverse voltage are the same. Say (True / False)
Ans: True
122. An open circuit is one that has a complete current path. Say (True / False)
Ans: False
123. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest
phase voltage. Say (True / False)
Ans: False
124. A balanced load is one in which all the impedances are equal. Say (True / False)
Ans: True
125. Amplitude is the maximum value of a voltage or current. Say (True / False)
Ans: True
126.Expand MMF _________
Ans: Magneto Motive Force
127. Expand MCCB ___________
Ans: Molded Case Circuit Breaker
128. Expand UPS ________
Ans: Un-interruptible Power Supply
129. Expand L.T.U.G ________
Ans: Low Tension Under Ground
130. SCR means __________
Ans: Silicon Controlled Rectifier
131. BJT Means________
Ans: Bipolar Junction Transistor
132.Expand VT_______
Ans:Voltage Transformer
133. Expand RMS ________
Ans: Root Mean Square
134. Expand PT_____
Ans: Potential Transformer
135. Expand NC_______
Ans: Normally Closed
136. Expand MCB______
Ans: Main Circuit Breaker
137. Expand KVA______
Ans: Kilovolt-Amperes
138. Expand HZ____
Ans: Hertz
139. Expand DC ________
Ans: Direct Current
140. Expand CT________
Ans: Current Transformer
141. Expand ATC______
Ans: Automatic Temperature Control
142. Expand AC_____
Ans: Alternating Current
143. Expand CFL _____
Ans: Compact Fluorescent Light
144. Expand kW _____
Ans: Kilowatt
145. Expand HF _____
Ans: High frequency
146. Expand NC_____
Ans: Normally closed
147. Expand ANSI_______
Ans: American National Standards Institute
148. Expand LED_____
Ans: Light emitting diode
149. Expand EMF _______
Ans: Electromotive force.
150. Expand NER_______Ans: Neutral earth resistor
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