Search
.Management Sciences
Category: Rectifiers and Converters
Which of the following is reversible in action ?
A. Motor generator set
B. Motor converter
C. Rotary converter
D. Any of the above
E. None of the above
Copper oxide rectifier is usually designed not to operate above___________?
A. 10°C
B. 20°C
C. 30°C
D. 45°C
A commutating rectifier consists of commutator driven by___________?
A. an induction motor
B. a synchronous motor
C. a D.C. series motor
D. a D.C. shunt motor
It is the_________of the transformer on which the magnitude of angle of overlap depends?
A. resistance
B. capacitance
C. leakage reactance
D. any of the above
In a three-phase mercury arc rectifiers each anode conducts for____________?
A. one-third of a cycle
B. one-fourth of a cycle
C. one-half a cycle
D. two-third of a cycle
Ageing of a selenium rectifier may change the output voltage by__________?
A. 5 to 10 per cent
B. 15 to 20 per cent
C. 25 to 30 per cent
D. none of the above
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
A. Mechanical rectifiers
B. Copper oxide rectifiers
C. Selenium rectifiers
D. Electrolytic rectifiers
E. Mercury arc rectifiers
The ionization potential of mercury is approximately_____________?
A. 5.4 V
B. 8.4 V
C. 10.4 V
D. 16.4 V
A rotary converter operates at a______________?
A. low power factor
B. high power factor
C. zero power factor
D. none of the above
A rotary converter is a single machine with______________?
A. one armature and one field
B. two armatures and one field
C. one armature and two fields
D. none of the above
Recent Comments