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MCQs

Total Questions : 305 | Page 1 of 31 pages
Question 1.   High ac voltages are usually measured with
  1.    electrostatic voltmeters
  2.    voltmeter and current transformer
  3.    potential transformer and voltmeter
  4.    voltmeter and multiplier
 Discuss Question
Answer: Option C. -> potential transformer and voltmeter
Question 2.  A dc wattmeter essentially consists of
  1.    two ammeters
  2.    a voltmeter and an ammeter
  3.    two voltmeters
  4.    a current and a potential transformer
 Discuss Question
Answer: Option B. -> a voltmeter and an ammeter
Question 3.  Which of the following instrument will be used to measure alternating current only?
  1.    moving-iron voltmeter
  2.    permanent-magnet type ammeter
  3.    induction-type ammeter
  4.    moving-iron (attraction-type) ammeter.
 Discuss Question
Answer: Option C. -> induction-type ammeter
Question 4.  The resistance of a field coil may be correctly measured by using
  1.    a voltmeter and an ammeter
  2.    Schering bridge
  3.    a Kelvin double bridge
  4.    a Maxwell bridge
 Discuss Question
Answer: Option A. -> a voltmeter and an ammeter
Question 5.  When connecting wattmeters to a load circuit consuming large current, it is necessary o use
  1.    potential transformers
  2.    isolation transformers
  3.    power shunts
  4.    current transformers
 Discuss Question
Answer: Option D. -> current transformers
Question 6.  Which of the following electrical equipment cannot convert ac into dc?
  1.    diode
  2.    converter
  3.    transformer
  4.    mercury-arc rectifier
 Discuss Question
Answer: Option C. -> transformer
Question 7.  A moving-coil instrument can be used to measure
  1.    low frequency a.c.
  2.    high frequency a.c.
  3.    direct current
  4.    d.c. and a.c. both
 Discuss Question
Answer: Option C. -> direct current
Question 8.   The electric device which blocks dc but allows ac is called
  1.    capacitor
  2.    inductor
  3.    amplifier
  4.    transducer
 Discuss Question
Answer: Option A. -> capacitor
Question 9. . By resolution of an indicating instrument is meant
  1.    the smallest change in the output reading due to drifting of pointer
  2.    the smallest change in applied stimulus which will indicate a detectable change in deflection
  3.    the difference between various readings for the same applied stimulus
  4.    none of these
 Discuss Question
Answer: Option B. -> the smallest change in applied stimulus which will indicate a detectable change in deflection
Question 10.  If the carrier of a 100 per cent modulated AM transmitter is suppressed,the percentage power saving will be
  1.    50
  2.    66.6
  3.    100
  4.    zero
 Discuss Question
Answer: Option B. -> 66.6

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