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# Fundamental of Electrical and Electronics Engg. 200+ MCQ | SBTE Bihar

Welcome students, In this post we are providing 200+ objectives questions of Fundamental of Electrical and Electronics Engineering subject. The MCQ is given chapter-wisely of FEEE. All objectives are very important and it will helps students to got 15+ marks out of 20 in SBTE diploma examination.

1. Which of the following is not a passive element?

2. A passive element

ANSWER= (C). Both (A) & (B)

3. Resistor is a

4. Resistance is measured in

5. Unit of inductance is

6. Unit of capacitance is

7. Two resistors of 4 â„¦ each are connected in series. What will be the total equivalent resistance?

8. Two resistors of 4 â„¦ each are connected in parallel. What will be the total equivalent resistance?

9. Two resistors of 3 â„¦ & 6 â„¦ are connected in series. What will be the total equivalent resistance?

10. Two resistors of 3 â„¦ & 6 â„¦ are connected in parallel. What will be the total equivalent resistance?

11. A capacitor stores

12. An inductor stores

13. Current in a capacitor is proportional to

14. Voltage in an inductor is proportional to

15. A capacitor differentiates

16. A capacitor integrates

17. An inductor differentiates

18. An inductor integrates

19. Capacitance of a capacitor is

20. Inductance of an inductor is

21. The main use of pn junction diode is as

22. The main use of zener diode is as

23. A pn junction diode conducts under

24. In forward bias of a diode

ANSWER= (C) p is positive & n is negative

25. The majority carriers in p- side of a pn junction diode are

26. The majority carriers in n- side of a pn junction diode are

27. BJT are of

ANSWER= (C) Both (A) and (B)

28. BJT has

29. A BJT can be used as

ANSWER= (D) both (A) and (B)

30. The arrow mark in symbol of BJT is given on

31. The arrow mark in symbol of NPN BJT isThe arrow mark in symbol of NPN BJT is

ANSWER= (B) out of emitter terminal

32. The arrow mark in symbol of PNP BJT is

ANSWER= (A) in to the emitter terminal

33. In a BJT the current flows due to

ANSWER= (C) both holes and electrons

34. “Bipolar” in BJT means

ANSWER= (A) current flows due to both electrons and holes

35. FET is a

36. FET can be

37. The terminals of FET are

38. A FET is

39. In a MOSFET, oxide layer is used to isolate ….. terminal

40. A MOSFET can be

ANSWER= (C) Either (a) or (b)

ANSWER= (D) both (a) and (b)

42. A DC signal voltage

43. An AC signal voltage ….. with respect to time.

44. The time period of periodic signal is

45. The time period of aperiodic signal is

46. An ideal voltage source has internal resistance

47. A non-ideal voltage source has internal resistance

48. An ideal voltage source provides constant

49. An ideal current source has internal resistance

50. A non-ideal current source has internal resistance

51. An ideal current source provides constant

52. Battery is an example of

53. Which is/are examples of independent voltage sources?

54. Op-amp is a/an

55. Op-amp is a

ANSWER= (D) Very high gain differential voltage amplifier

56. Op-amp IC 741 has

57. Op-amp power supply is

58. Voltage gain of ideal Op-amp is

59. Voltage gain of practical Op-amp is

60. Voltage gain of Op-amp 741 is

61. Input resistance of ideal Op-amp is

62. Input resistance of practical Op-amp is

63. Bandwidth of ideal Op-amp is

64. Bandwidth of practical Op-amp is

65. CMRR of ideal Op-amp is

66. CMRR of practical Op-amp is

67. Output resistance of ideal Op-amp is

68. Output resistance of practical Op-amp is

69. Slew rate of ideal Op-amp is

70. Op-amp uses

ANSWER= (C) Both (A) and (B)

71. Virtual ground of Op-amp means

ANSWER= (B) input terminals are not physically grounded but their potential difference is zero

72. Slew rate is defined as

ANSWER= (D) maximum rate of change of output voltage

73. Op-amp is used in

ANSWER= (C) Both (A) and (B)

74. Op-amp is mostly used in

76. Op-amp without feedback is called

77. Op-amp with feedback is called

78. Op-amp integrator uses

ANSWER= (A) capacitor as feedback element

79. Op-amp differentiator uses

ANSWER= (B) capacitor as input element

80. Gain of inverting amplifier is given by

81. Gain of non-inverting amplifier is given by

82. For a inverting amplifier, Ri=1kÎ©, Rf=2kÎ©, Vi=2.5 V, then Vo will be

83. For a non-inverting amplifier, Ri=1kÎ©, Rf=2kÎ©, Vi=2.5 V, then Vo will be

84. Input signal of an integrator is square wave, the output will be

85. Input signal of a differentiator is square wave, the output will be

86. Input signal of an integrator is step signal, the output will be

87. Input signal of a differentiator is ramp signal, the output will be

88. An air gap is usually inserted in a magnetic circuits to

89. Permeability in a magnetic circuit corresponds to .......in an electric circuit

90. In a magnetic material hysteresis loss takes place primarily due to

91. The property of a material which opposes the creation of magnetic flux in it is known as

92. The area of his hysteresis loss is a measure of

ANSWER= (C) Energy loss per cycle

93. In order to minimise hysteresis loss, the magnetic material should have

94. The unit of magnetic flux is

95. The unit of reluctance is

96. Reciprocal of reluctance is

97. Conductivity is analogous to

98. Conductance is analogous to

99. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?

100. The unit of retentivity is

101. Magnetic field is ........ Quantity.

102. The B-H curve will be a straight line of

103. 1 Tesla =?

104. The SI unit of reluctance is

105. The unit of relative permeability is

106. The permeability of vacuum is

ANSWER= (C) Both (a) and (b)

107. Relative permeability is given by

108. Which of the following statement is valid?

ANSWER= (A) Lenz’s law is a consequence of the law of conservation of energy

109. Which of the following is found using Lenz’s law?

ANSWER= (C) The direction of induced emf

110. The law which states that the direction of induced current in a circuit is such that it opposes the cause or the change which produces it is

111. Which among the following is true about Faraday’s law of Induction?

ANSWER= (A) An emf is induced in a conductor when it cuts the magnetic flux

112. What is proportional to the magnitude of the induced emf in the circuit?

ANSWER= (C) Rate of change of magnetic flux

113. Faraday’s laws are result of the conservation of which quantity?

114. Direction of induced emf is determined by _________.

ANSWER= (B) Fleming’s right hand rule

115. According to Faraday’s laws of electromagnetic induction, an emf is induced in a conductor whenever?

ANSWER= (C) Cuts magnetic lines of flux

116. According to Fleming’s right hand rule, the thumb points towards?

ANSWER= (C) Motion of the conductor

117. According to Fleming’s right hand rule, the index finger points towards?

118. According to Fleming’s right hand rule, the index finger points towards?

119. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

120. If a sine wave goes through 10 cycles in 20 Î¼s, the period is

121. How many degrees are there in Ï€/3 rad?

122. If the peak of a sine wave is 13 V, the peak-to-peak value is

123. The average value of a 12 V peak sine wave over one complete cycle is

124. A signal with a 400 Î¼s period has a frequency of

125. The average half-cycle value of a sine wave with a 40 V peak is

126. In general in an alternating current circuit

ANSWER= (A) The average value of current is zero

127. Alternating currents can be produced by a

128. An A.C. source is connected to a resistive circuit. Which of the following is true?

ANSWER= (C) Current and voltage are in same phase

129. In which of the following circuits the maximum power dissipation is observed?

130. With increase in frequency of an A.C. supply, the inductive reactance

ANSWER= (B) increases directly with frequency

131. If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will

132. A capacitor acts as an infinite resistance for

133. Of the following about capacitive reactance which is correct?

ANSWER= (B) Capacitive reactance is inversely proportional to the frequency of the current

134. Phase difference between voltage and current in a capacitor in an ac circuit is

135. A capacitor has capacitance C and reactance X, if capacitance and frequency become double, then reactance will be

136. In series RLC circuit if resistance increases quality factor

137. In series RLC circuit, the reactance of the .......... with increasing frequency.

138. With increase in frequency of an A.C. supply, the impedance of an RLC series circuit

ANSWER= (D) decreases at first, becomes minimum and then increases.

139. If an RLC series circuit is connected to an ac source, then at resonance the voltage across

ANSWER= (B) R equals the applied voltage

140. In an RLC series a.c. circuit, the current

141. An RLC series circuit is at resonance. Then the voltage across

ANSWER= (B) R equals applied voltage

142. At resonance frequency the impedance in series RLC circuit is

143. At resonant frequency the current amplitude in series RLC circuit is

144. The power factor in a circuit connected to A.C. is

ANSWER= (B) unity when the circuit contains an ideal resistance only

145. Power factor is one for

146. Power factor of the A. C. circuit varies between

147. The graph between inductive reactance and frequency is

148. For minimum dissipation of energy in the circuit the power factor should be

149. The correct formula to determine the Q factor of series resonance circuit is

150. For a sine wave with peak value Emax the average value

151. For a sine wave with peak value Imax the r.m.s. value

152. Form factor for a sine wave is

153. The form factor is the ratio of

ANSWER= (B) r.m.s. value to average value

154. The period of a wave is

ANSWER= (B) Time required to complete one cycle

155. For delta-connected circuit the correct relationship is

ANSWER= (D) Both (a) and (b)

156. Power factor of an inductive circuit is usually improved by adding a capacitor to it in

ANSWER= (C) Either series or parallel

157. The power factor of an AC circuit is equal to

ANSWER= (A) Cosine of the phase angle

158. The power factor of an AC circuit lies between

159. A circuit component that oppose the change in the circuit voltage is

160. In a circuit containing R, L and C, power loss can take place in

161. In any AC circuit always

ANSWER= (A) Apparent power is more than actual power

162. A parallel AC circuit in resonance will

ANSWER= (B) Have a high impedance

163. The frequency of an alternating current is

ANSWER= (C) The number of waves passing through a point in one second

164. The unit of frequency is

165. When an alternating current passes through an ohmic resistance the electrical power converted into HEAT is

166. In an AC circuit ( sine wave ) with R and L in series

ANSWER= (B) The voltage across R lags the voltage across L by 90o

167. In AC circuit the power curve is a sine wave having

ANSWER= (A) Double the frequency of voltage

168. The power factor of practical inductor is

169. Unit of reactive power is

170. Real part of admittance is ...... and the imaginary part is .....

171. Capacitive Susceptance is a measure of

ANSWER= (A) A purely capacitive circuit's ability to pass current

172. Unit of inductive reactance is

173. The r.m.s. value of a sine wave is 100 A. Its peak value is

174. Which of the following will not be affected due to change in R ?

175. Change in circuit voltage will affect

176. A current is said to be direct current when its

ANSWER= (A) Magnitude remains constant with time

177. In a pure inductive circuit

ANSWER= (B) The current legs behind the voltage by 90o

178. In a purely inductive circuit

ANSWER= (A) Actual power is zero

179. The inductance of a coil can be increased by

ANSWER= (D) Choosing core material having high permeability

180. In a purely inductive circuit if the supply frequency is reduced to 1/2, the current will

181. In a highly capacitive circuit

ANSWER= (C) Reactive power is more than the actual power

182. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will

ANSWER= (A) Be reduced by half

183. Capacitive reactance is more when

ANSWER= (A) Capacitance is less and frequency of supply is less

184. In a purely resistive, the average power Pav is ........the peak power Pmax

185. In a pure resistive circuit

ANSWER= (D) Current is in phase with the voltage

186. For a purely resistive circuit the following statement is in correct

ANSWER= (D) Power factor is unity

187. The power factor at resonance in R-L-C parallel circuit is

188. Magnitude of current at resonance in R-L-C circuit

ANSWER= (A) Depends upon the magnitude of R

189. The quality factor of R-L-C circuit will increase if

190. In a series R-L-C circuit at resonance

191. The dynamic impedance of an R-L and C parallel circuit at resonance is .....ohm.

192. The dynamic impedance of an R-L and C parallel circuit at resonance is .....ohm.

193. A series R-L-C circuit will have unity power factor if operated at a frequency of

ANSWER= (D) 1/ 2 Ï€ √ LC

194. In a series R-L-C circuit at resonance, the magnitude of voltage developed across the capacitor

ANSWER= (B) Can never be greater than the input voltage

195. When a sinusoidal voltage is applied across R-L series circuit having R = XL, the phase angle will be

196. In a series of resonant circuit, with an increase in L

ANSWER= (D) All of the above

197. In a series resonant circuit with the increase in the value of C

ANSWER= (D) Both A and B

198. A resonance curve for a series circuit is a plot of frequency versus

199. Higher the Q of a series circuit

ANSWER= (B) Narrower its pass band

200. A high Q coil has

201. When Q-factor of a circuit is high, then

ANSWER= (B) Impedance of the circuit is high

202. Higher the Q of a series circuit, narrower its

203. Transformer works on the principle of

204. Transformer core is generally made of _________.

ANSWER= (A) stacking of large number of sheets together

205. The purpose of the transformer core is to provide __________.

206. Transformer ratings are given in ____________.

207. Which type of flux does transformer action need?

208. For a transformer with primary turns 400, secondary turns 100, if 20A current is flowing through primary, we will get __________.

209. Which of the following is the main advantage of an auto-transformer over a two-winding transformer?

ANSWER= (C) Saving in winding material

210. For a transformer with primary turns 100, secondary turns 400, if 200 V is applied at primary we will get ........

ANSWER= (C) 800 V at secondary

211. Transformer core is designed to reduce ____________.

ANSWER= (C) Hysteresis loss and Eddy current loss

212. Transformers windings are generally made of ________.

213. Function of transformer is to ____________.

ANSWER= (D) Step down or up the AC voltages and currents

214. Transformer core is constructed for ___________.

215. Transformer operating at 25-400 Hz frequency contain core made of ___________.

ANSWER= (D) highly permeable iron and Steel alloy

216. There is only one magnetic flux path in the circuit. The transformer is definitely ____________.

217. Core type transformer is with _____________.

218. What is the purpose of providing an iron core in a transformer?

ANSWER= (C) Decrease the reluctance of the magnetic path

219. What is the thickness of laminations used in a transformer?

ANSWER= (A) 0.1 mm - 0.5 mm

220. Primary winding of a transformer __________.

ANSWER= (C) Could either be a low voltage or high voltage winding

221. Which winding has more number of turns?

222. Part of the transformer which undergoes most damage from overheating is _______.

223. If secondary number of turns are higher then, transformer is called ________.

224. If primary number of turns are higher then, transformer is called _________.

225. If a transformer is having equal number of turns at primary and secondary then transformer is called as _________.

226. A transformer cannot work on the DC supply because ____________.

ANSWER= (C) Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero

227. In a transformer the resistance between its primary and secondary is ___________.

228. Identify the correct statement relating to the ideal transformer.

ANSWER= (A) no losses and magnetic leakage

229. Ideal transformer core has permeability equal to _____.

230. Turns ratio of the transformer is directly proportional to __________.

231. Which of the following statement is correct regarding turns ratio?

ANSWER= (A) Current ratio and turns ratio are inverse of each other

232. Which of the following is the wrong expression?

233. Power transformed in the ideal transformer with turns ratio a is _______.

234. If turns ratio is “a”, the impedance of secondary with respect to primary will be

ANSWER= (A) a^2times the primary impedance

235. Who discovered the magnetic effect of electric current?

236. What is the working principle of DC motor?

ANSWER= (B) Fleming’s left hand rule

237. Who invented AC motor?

238. Electric motor is a device which converts

ANSWER= (B) Electrical energy into mechanical energy

239. Electric motor works on the principle of

ANSWER= (C) magnetic effect of current

240. The magnet used for construction of electric motor

241. The direction of current in dc motor is reversed by

242. Electric motor can be used in