Basic Electrical Engineering

71. The effect of increasing air gap length in the induction motor will increase the

  1. power factor
  2. speed
  3. magnetising current
  4. air gap flux

Correct answer: (C)
magnetising current

72. The energy required to charge a 10 uF capacitor to 100V is

  1. 0.10 J
  2. 0.05 J
  3. 5 X 10-9 J
  4. 10 X 10-9 J

Correct answer: (B)
0.05 J

73. The energy required to move 120 coulomb through 3V is

  1. 25mJ
  2. 360J
  3. 40J
  4. 2.78mJ

Correct answer: (B)
360J

74. The five 0.050 µF capacitors are connected in series. The equivalent capacitance is

  1. 0.010 µf
  2. 0.25 µf
  3. 0.50 µf
  4. 0.025 µf

Correct answer: (A)
0.010 µf

75. The five 0.050uF capacitors are connected in parallel. The equivalent capacitance is

  1. 0.010 uf
  2. 0.25 uf
  3. 0.50uf
  4. 0.025uf

Correct answer: (B)
0.25 uf

76. The frequency of DC supply is

  1. 16 2/3 Hz
  2. 60 Hz
  3. 50 Hz
  4. 0 Hz

Correct answer: (D)
0 Hz

77. The frequency of voltage generated by an alternator having 4 poles and rotating at 1800 rpm is

  1. 60 Hz
  2. 7200 Hz
  3. 120 Hz
  4. 450 Hz

Correct answer: (A)
60 Hz

78. The gauss is a unit of

  1. Charge carrier flow speed.
  2. Magnetic flux density.
  3. Electrostatic field strength.
  4. Electromagnetic field intensity.
  5. Electrical charge quantity.

Correct answer: (B)
Magnetic flux density.

79. The internal conductance of an ammeter is generally

  1. Low
  2. Directly proportional to the current
  3. Inversely proportional to the current
  4. High
  5. Any value. It doest matter

Correct answer: (D)
High

80. The length of time between a point in one cycle and the same point in the next cycle of an ac wave is the

  1. Frequency
  2. Magnitude
  3. Period
  4. Polarity

Correct answer: (C)
Period

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