Basic Electrical Engineering

61. Telemetering is a method of?

  1. Counting pulses sent over long distances
  2. Transmitting pictures from one place to another
  3. Transmitting information concerning a process over a distance
  4. None

Correct answer: (C)
Transmitting information concerning a process over a distance

62. The advantage of AC over DC in utility applications is

  1. AC is easier to transform from one voltage to another
  2. AC is transmitted with lower loss in wires
  3. AC can be easily obtained from dc generators
  4. AC can be generated with less dangerous by products

Correct answer: (A)
AC is easier to transform from one voltage to another

63. The best filter for a power supply is

  1. a capacitor in series
  2. a choke in series
  3. a capacitor in series and a choke in parallel
  4. a capacitor in parallel and a choke in series

Correct answer: (D)
a capacitor in parallel and a choke in series

64. The color code of a resistor 2.7Kohm with the tolerance of 10% is

  1. red, violet, red and silver
  2. red, violet, yellow and gold
  3. red, violet, orange, silver
  4. red, violet, red,gold

Correct answer: (A)
red, violet, red and silver

65. The colour bands on a carbon composition resistor occur in the sequence: yellow, violet, yellow and silver. Its resistance is

  1. 470 KΩ± 47 KΩ
  2. 470 KΩ± 23.5 %
  3. 47 KΩ± 10 %
  4. 47 KΩ± 5 %

Correct answer: (C)
47 KΩ± 10 %

66. The combined resistance of two equal resistors connected in parallel is equal to

  1. One half the resistance of one resistor
  2. twice the resistance of one resistor
  3. four times the resistance of one resistor
  4. one fourth the resistance of one resistor

Correct answer: (A)
One half the resistance of one resistor

67. The current carrying capacity of a 1W, 4MΩ resistor used in radio receiver is

  1. 0.5kA
  2. 2kA
  3. 2mA
  4. 0.5mA

Correct answer: (D)
0.5mA

68. The current gain of a bipolar transistor drops at high frequencies because of

  1. Transistor capacitance
  2. High current effects in the base
  3. Parasitic inductive elements
  4. the early effect

Correct answer: (A)
Transistor capacitance

69. The current in a inductor changes from 0 to 200mA in 4ms and induces a voltage of 100mV. The value of inductor is

  1. 2mH
  2. 0.5mH
  3. 8mH
  4. 4mH

Correct answer: (A)
2mH

70. The derivative of a sine wave

  1. Is shifted in phase by ½ cycle from the sine wave
  2. Is the rate of change in the instantaneous value
  3. Has instantaneous rise and decay times
  4. Rise instantly, but decays slowly

Correct answer: (B)
Is the rate of change in the instantaneous value

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