Electrical machine design

Must be a good insulator

Should be non-evaporating

Should not have corrosive action upon the metal of the vane

The viscosity of the oil should not change with the temperature E. All of the above

200 to 400 r.p.m.

600 to 1000 r.p.m.

1000 to 1500 r.p.m.

2000 to 2500 r.p.m.

platinum

maganin

silver

nichrome

ground fault on a cable

short circuit fault on a cable

both the ground fault and the short-circuit fault

none of the above

2 to 3 times greater

3 to 4 times greater

4 to 5 times greater

none of the above

air

hydrogen

either (A) or (B)

none of the above

linear

non-linear

either (A) or (B)

neither (A) nor (B)

a few volts only

1 kV

5 kV

10 kV

Equivalent current method

Equivalent power method

Equivalent torque method

Method of average losses

50 MW

100 MW

200 MW

none of the above