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