Electrical machine design Archives - Page 4 of 18 - MCQ and Quiz for Exams

31. A potentiometer may be used for

measurement of resistance

measurement of current

calibration of ammeter

calibration of voltmeter E. all of the above

Detailed SolutionA potentiometer may be used for

32. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of

short pitch

full pitch

either of the above

none of the above

Detailed SolutionWhen the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of

33. The electrical power to a meggar is provided by

battery

permanent magnet D.

generator C. A.C. generator

any of the above

Detailed SolutionThe electrical power to a meggar is provided by

34. The power factor of a single phase load can be calculated if the instruments available are

one voltmeter and one ammeter

one voltmeter, one ammeter and one wattmeter

one voltmeter, one ammeter and one energy meter

any of the above

Detailed SolutionThe power factor of a single phase load can be calculated if the instruments available are

35. In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

out of phase by 90Â°

out of phase by 60Â°

out of phase by 30Â°

out of phase by 0Â°

Detailed SolutionIn an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

36. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

almost zero

low

high

none of the above

Detailed SolutionThe resistance in the circuit of the moving coil of a dynamometer wattmeter should be

37. Systematic errors are

instrumental errors

environmental errors

observational errors

all of the above

Detailed SolutionSystematic errors are

38. The household energy meter is

an indicating instrument

a recording instrument

an integrating instrument

none of the above

Detailed SolutionThe household energy meter is

39. The winding where dummy coils are used is sometimes called

Duplex winding

Triplex winding

Forced winding

None of the above

Detailed SolutionThe winding where dummy coils are used is sometimes called

40. Which of the following brushes can be used for high values of current density ?

Metal graphite brushes

Hard carbon brushes

Electro-graphitic brushes

Natural graphite brushes

Detailed SolutionWhich of the following brushes can be used for high values of current density ?

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