Basic Electrical Engineering

51. Inductors in series, assuming there is no mutual inductance, combine

  1. Like resistors in parallel
  2. Like resistors in series
  3. Like batteries in series with opposite polarities
  4. In a way unlike any other type of component

Correct answer: (B)
Like resistors in series

52. It is required to measure temperature in the range of 13000 deg C to 15000 deg c. The most suitable thermocouple to be used as a transducer would be?

  1. chromel - constantan
  2. Iron - constantan
  3. chromel - alumel
  4. platinum- rhodium

Correct answer: (D)
platinum- rhodium

53. Load factor is defined as the ratio of

  1. max demand/ average demand
  2. average demand/ connected load
  3. average demand/ max. demand
  4. connected load/ max demand

Correct answer: (D)
connected load/ max demand

54. On a spectrum analyzer, a ac signal having only one frequency component looks like

  1. A single pip
  2. A sine wave
  3. A square wave
  4. A sawtooth wave

Correct answer: (A)
A single pip

55. One waveform has a peak value of ±3V and the other has peak value of ±5V. These two waves are in phase coincidence. The resultant has voltages of

  1. ±8Vpk, in phase with the composites
  2. ±2 Vpk, in phase with the composites
  3. ±8Vpk, in phase opposition with respect to the composites
  4. ±2 Vpk, in phase opposition with respect to the composites

Correct answer: (A)
±8Vpk, in phase with the composites

56. Power is defined as

  1. the rate at which current flows in a circuit
  2. the product of voltage and resistance in a circuit
  3. the rate at which energy is radiated or dissipated
  4. the accumulation of energy over time
  5. the amount of heat generated in a circuit.

Correct answer: (C)
the rate at which energy is radiated or dissipated

57. Q factor of an inductive coil is given by

  1. 2π fL/R
  2. 2π fr/R
  3. R/Z
  4. lr/l

Correct answer: (B)
2π fr/R

58. Silicon has a preference in IC technology because

  1. it is an indirect semiconductor
  2. it is a covalent semiconductor
  3. it is an elemental semiconductor
  4. of the availability of nature oxide SiO

Correct answer: (D)
of the availability of nature oxide SiO

59. Squirrel cage bars placed in the rotor pole faces of an alternator help reduce hunting

  1. above synchronous speed only
  2. below synchronous speed only
  3. above and blow synchronous speeds both
  4. none of the above

Correct answer: (C)
above and blow synchronous speeds both

60. Suppose that two ac waves have the same frequency but differ in phase by exactly 1/20 of a cycle. What is the phase difference between these two waves?

  1. 18 deg
  2. 20 deg
  3. 36 deg
  4. 5.73 deg

Correct answer: (A)
18 deg

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