Transformers

lags behind the voltage by about 75°

leads the voltage by about 75°

lags behind the voltage by about 15°

leads the voltage by about 15°

short-circuit test

back-to-back test

open circuit test

any of the above

less will be the secondary induced e.m.f.

less will be the primary induced e.m.f.

less will be the primary terminal voltage

none of the above

sludge

odour

gases

moisture

33 kV

66 kV

132 kV

400 kV E. 765 kV

value of transformation ratio remains constant

permeability of transformer core remains constant

core flux remains practically constant

primary voltage remains constant

about the same

much smaller

much higher

somewhat smaller

load changes

oil in the transformer

magnetostriction

mechanical vibrations

0.4 mm to 0.5 mm

4 mm to 5 mm

14 mm to 15 mm

25 mm to 40 mm

Its secondary current is 5 A

Its secondary voltage is 400 V

supply is incorrect? A. Its secondary current is 5 A B. Its secondary voltage is 400 V C. Its rating is 2 kVA

Its secondary current is 20 A