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31
A current density of _________ is used for large power transformers with forced circulation of oil or with water cooling coils.
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Answer: Option D
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32
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
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Answer: Option C
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33
_______ brushes are fragile and cause excessive wear of commutator,
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Answer: Option A
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34
To avoid the effect of stray magnetic field in A.C. bridges we can use
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Answer: Option A
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35
It is required to measure the true open circuit e.m.f. of a battery. The best device is
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Answer: Option C
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36
Hydrogen has a heat transfer co-efficient _____ times that of air
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Answer: Option A
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37
The thermal conductivity of hydrogen is ______ times that of air
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Answer: Option D
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38
The design of mechanical parts is particularly important in case of _____ speed machines.
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Answer: Option C
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39
A voltage of about 200 V can be measured
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Answer: Option B
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40
Which of the following is measured by using a vector voltmeter ?
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Answer: Option D
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