1) The electrolytic energy meters are essentially
a. A true watt - hour meter
b. An ampere hour meter
c. Either watt - hour or ampere hour meter
d. Neither watt - hour nor ampere hour meter
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Answer
Explanation
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ANSWER: An ampere hour meter
Explanation:
No explanation is available for this question!
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2) For friction compensation in an induction watt-hour meter is done by making
a. The ratio of the shunt magnet flux and series magnet flux large with the help of two shading bands
b. The ratio of the series magnet flux and shunt magnet flux large with the help of two shading bands
c. The ratio of the shunt magnet flux and series magnet flux large with the help of three shading bands
d. The ratio of the series magnet flux and shunt magnet flux large with the help of three shading bands
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Answer
Explanation
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ANSWER: The ratio of the shunt magnet flux and series magnet flux large with the help of two shading bands
Explanation:
No explanation is available for this question!
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3) In induction watt - hour meter, due to shunt magnet the torque is not zero power factor. It can be compensated by using
a. Shading ring
b. Power factor compensator
c. Drilling holes in the disc on a diameter
d. Both (a) and (b)
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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4) The induction type single - phase watt - hour meters uses
a. Control spring
b. Pointer
c. Brake magnet and spindle
d. All of these
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Answer
Explanation
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ANSWER: Brake magnet and spindle
Explanation:
No explanation is available for this question!
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5) Commutator motor meters are
a. Ampere hour meter
b. True watt - hour meter
c. Either ampere hour meter or true watt - hour meter
d. None of these
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Answer
Explanation
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ANSWER: Either ampere hour meter or true watt - hour meter
Explanation:
No explanation is available for this question!
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6) In motor meters, the speed control of the rotating system is done by using
a. Permanent magnet
b. Train of gear wheels and dials
c. Pinion
d. All of these
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Answer
Explanation
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ANSWER: Permanent magnet
Explanation:
No explanation is available for this question!
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7) In case of motor meters, the speed of rotation is
a. Directly proportional to the current in case of ampere hour meter and to power in case of watt-hour meter
b. Directly proportional to the current in case of ampere hour meter and inversely proportional to the power in case of watt-hour meter
c. Inversely proportional to the current in case of ampere hour meter and directly proportional to the power in case of watt-hour meter
d. Inversely proportional to the current in case of ampere hour meter and to power in case of watt-hour meter
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Answer
Explanation
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ANSWER: Directly proportional to the current in case of ampere hour meter and to power in case of watt-hour meter
Explanation:
No explanation is available for this question!
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8) Commutator type meters can be used for
a. AC supply
b. DC supply
c. Both AC and DC supply
d. None of these
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Answer
Explanation
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ANSWER: Both AC and DC supply
Explanation:
No explanation is available for this question!
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9) An electrolytic ampere hour meter can be converted into watt - hour meter by
a. Multiplying them by the voltage of the circuits in which it is used
b. Multiplying them by the current of the circuits in which it is used
c. Multiplying them by the power of the circuits in which it is used
d. Cannot be converted
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Answer
Explanation
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ANSWER: Multiplying them by the voltage of the circuits in which it is used
Explanation:
No explanation is available for this question!
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10) The instrument which works only with DC is
a. Electrolytic motor
b. Mercury motor
c. Induction motor
d. Both (a) and (b)
e. None of these
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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