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MCQs

Total Questions : 327 | Page 10 of 33 pages
Question 91. Magnitude of current at resonance in r-l-c circuit
  1.     Depends upon the magnitude of R
  2.     Depends upon the magnitude of L
  3.     Depends upon the magnitude of C
  4.     Depends upon the magnitude of R, Land C
 Discuss Question
Answer: Option A. ->  Depends upon the magnitude of R
Question 92. The reactance offered by a capacitor to alternating current of frequency 50 hz is 20 q. if frequency is increased to 100 hz, reactance becomes __________ ohms.
  1.     2.5
  2.     5
  3.     10
  4.     15
 Discuss Question
Answer: Option C. ->  10
Question 93. Inductance of a coil varies
  1.     Directly as the cross-sectional area of magnetic core
  2.     Directly as square of number of turns
  3.     Inversely as the length of the iron path
  4.     As A to C
 Discuss Question
Answer: Option D. ->  As A to C
Question 94. In a highly capacitive circuit the
  1.     Apparent power is equal to the actual power
  2.     Reactive power is more than the apparent power
  3.     Reactive power is more than the actual power
  4.     Actual power is more than its reactive power
 Discuss Question
Answer: Option C. ->  Reactive power is more than the actual power
Question 95. Capacitors for power factor correction are rated in
  1.     kW
  2.     kVA
  3.     kV
  4.     kVAR
 Discuss Question
Answer: Option D. ->  kVAR
Question 96. The power is measured in terms of decibels in case of
  1.     Electronic equipment
  2.     Transformers
  3.     Current transformers
  4.     Auto transformers
 Discuss Question
Answer: Option A. ->  Electronic equipment
Question 97. The r.m.s. value of alternating current is given by steady (d.c.) current which when flowing through a given circuit for a given time produces
  1.     The more heat than produced by A.C. when flowing through the same circuit
  2.     The same heat as produced by A.C. when flowing through the same circuit
  3.     The less heat than produced by A.C. flowing through the same circuit
  4.     None of the above
 Discuss Question
Answer: Option B. ->  The same heat as produced by A.C. when flowing through the same circuit
Question 98. The frequency of an alternating current is
  1.     The speed with which the alternator runs
  2.     The number of cycles generated in one minute
  3.     The number of waves passing through a point in one second
  4.     The number of electrons passing through a point in one second
 Discuss Question
Answer: Option C. ->  The number of waves passing through a point in one second
Question 99. In a circuit containing r, l and c, power loss can take place in
  1.     C only
  2.     L only
  3.     R only
  4.     All above
 Discuss Question
Answer: Option C. ->  R only
Question 100. In a loss-free r-l-c circuit the transient current is
  1.     Oscillating
  2.     Square wave
  3.     Sinusoidal
  4.     Non-oscillating
 Discuss Question
Answer: Option C. ->  Sinusoidal

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