A. shunt motor
B. synchronous motor
C. induction regulator
D. synchronous generator
A. maximum grid voltage
B. critical grid voltage
C. any of the above
D. none of the above
A. Copper oxide rectifier is a linear device
B. Copper oxide rectifier is not a perfect rectifier
C. Copper oxide rectifier has a low efficiency
D. Copper oxide rectifier finds use in control circuits
E. Copper oxide rectifier is not stable during early life
Which of the following statement is incorrect ? Read More »
Rectifiers and Converters A. magnitude
B. polarity
C. phase
D. any of the above
E. none of the above
In phase-shift control method the control is carried out by varying the of grid voltage Read More »
Rectifiers and Converters 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
Copper oxide rectifier is usually designed not to operate above___________? Read More »
Rectifiers and Converters A. 5 to 10 per cent
B. 15 to 20 per cent
C. 25 to 30 per cent
D. none of the above
Ageing of a selenium rectifier may change the output voltage by__________? Read More »
Rectifiers and Converters A. 90 to 95%
B. 85 to 90%
C. 80 to 85%
D. 65 to 75%
The efficiency of the copper oxide rectifier seldom exceeds____________? Read More »
Rectifiers and Converters A. 25°C
B. 40°C
C. 60°C
D. 75°C
Selenium rectifier can be operated at temperatures as high as____________? Read More »
Rectifiers and Converters A. 10 V
B. 30 V
C. 60 V
D. 100 V
E. 200 V
