Month: December 2018

A. They are mechanically strong
B. They do not require any voltage for filament heating
C. Both (A) and (B)
D. None of the above

A. 10°C
B. 20°C
C. 30°C
D. 45°C

A. 5 to 10 per cent
B. 15 to 20 per cent
C. 25 to 30 per cent
D. none of the above

A. 90 to 95%
B. 85 to 90%
C. 80 to 85%
D. 65 to 75%

A. 25°C
B. 40°C
C. 60°C
D. 75°C

A. 10 V
B. 30 V
C. 60 V
D. 100 V
E. 200 V

A. 25, 35
B. 40, 50
C. 60, 70
D. 75, 85

A. an induction motor
B. a synchronous motor
C. a D.C. series motor
D. a D.C. shunt motor

A. copper
B. aluminium
C. silver
D. graphite
E. tungsten

A. Copper oxide rectifiers
B. Selenium rectifiers
C. Mercury arc rectifiers
D. Mechanical rectifiers
E. None of the above