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MCQs

Total Questions : 247 | Page 1 of 25 pages
Question 1.   The area of a sinusoidal wave over a half-cycle is
  1.    max. value 2
  2.    2 x max. value
  3.    max. value + IL
  4.    max. value 4-2n
 Discuss Question
Answer: Option B. -> 2 x max. value
Question 2.   Alternating voltages and currents are expressed in r.m.s. values because
  1.    they can be easily determined
  2.    calculations become very simple
  3.    they give comparison with d.c.
  4.    none of the above
 Discuss Question
Answer: Option C. -> they give comparison with d.c.
Question 3.   The average value of sin20 over a complete cycle is
  1.    1
  2.    ?1
  3.    1/2
  4.    zero
 Discuss Question
Answer: Option C. -> 1/2
Question 4.  Three parallel circuits take the following currents : = sin 3141; i2 = 30 sin (324t +7c/2); i3 = 25 sin (314t ? n/2) The expression for the resultant current is
  1.    25 sin (314 t + n/3)
  2.    5 sin (314 t + n/2)
  3.    10 sin (314 t ? n/6)
  4.    5 ri sin (314 t + n/4)
 Discuss Question
Answer: Option D. -> 5 ri sin (314 t + n/4)
Question 5.   The form factor of a sinusoidal wave is
  1.    1.414
  2.    1.11
  3.    2
  4.    1.5
 Discuss Question
Answer: Option B. -> 1.11
Question 6.  Each of the three coils generates an e.m.f. of 230 V. The e.m.f. of second leads that of the first by 120? and the third lags behind the first by the same angle. The resultant e.m.f. across the series combination of the coils is
  1.    0V
  2.    230 V
  3.    690 V
  4.    none of the above
 Discuss Question
Answer: Option A. -> 0V
Question 7.  In a pure resistive circuit, the instantaneous voltage and current are given by : v = 250 sin 3141 volts i = 10 sin 3141 amperes The peak power in the circuit is
  1.    1250 W
  2.    25 W
  3.    2500W
  4.    250 W
 Discuss Question
Answer: Option C. -> 2500W
Question 8.  Power absorbed in a pure inductive circuit is zero because
  1.    reactive component of current is zero.
  2.    active component of current is maximum
  3.    power factor of the circuit is zero
  4.    reactive and active components of current cancel out
 Discuss Question
Answer: Option C. -> power factor of the circuit is zero
Question 9.  An alternating voltage v = Vm sin 0 is applied to a pure capacitive circuit. The current equation will be
  1.    1m sin 0
  2.    Im sin (0 ? n/2)
  3.    1m sin (0 + n/4)
  4.    Im sin (0 + n/2)
 Discuss Question
Answer: Option D. -> Im sin (0 + n/2)
Question 10. . An electric bulb rated at 220 V is connected to 220 V, 5 Hz a.c. source. Then the bulb
  1.    does not glow
  2.    fuses
  3.    glows continuously
  4.    glows intermittently
 Discuss Question
Answer: Option D. -> glows intermittently

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