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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 9 of 39 pages
Question 81. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
  1.    25%
  2.    50%
  3.    1%
  4.    100%
 Discuss Question
Answer: Option A. -> 25%
Question 82. The length of a phasor represents the amplitude.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 83. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is
  1.    0°
  2.    45°
  3.    40°
  4.    None of the above
 Discuss Question
Answer: Option C. -> 40°
Question 84. Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 85. A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle
  1.    Is 1%
  2.    Is 30%
  3.    Is 100%
  4.    Cannot be determined
 Discuss Question
Answer: Option B. -> Is 30%
Question 86. Which antenna is a wideband antenna?
  1.    Hertz antenna
  2.    None of these
  3.    Marconi antenna
  4.    Folded dipole
 Discuss Question
Answer: Option D. -> Folded dipole
Question 87. A loop antenna is a commonly used for
  1.    All of these
  2.    Direction finding
  3.    Radar
  4.    Satellite communication
 Discuss Question
Answer: Option B. -> Direction finding
Question 88. The divergence of a vector is a scalar, while the curl of a vector is another
  1.    Scalar
  2.    Vector
  3.    None of these
  4.    Unit vector
 Discuss Question
Answer: Option B. -> Vector
Question 89. The potential that appears at a point in space due to the current which caused it is called potential
  1.    Retardation
  2.    Accelerating
  3.    Lagging the current
  4.    Oscillating
 Discuss Question
Answer: Option A. -> Retardation
Question 90. The minimum height of outer atmosphere is
  1.    150 km
  2.    200 km
  3.    400 km
  4.    100 km
 Discuss Question
Answer: Option C. -> 400 km

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