Converters & rectifiers objective questions with explanations

Converters & rectifiers objective questions with explanations for ESE,GATE,SSC, RRB& other exam

Q no 1. A rotary converter is a single m/c with 

             a ) one armature and one field

             b ) two armature and one field

             c ) one armature and two fields

explanations 

                   answer :   a ) one armature and one field

Q no 2. 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 

Q no 3. With a Motor converter it is possible to obtain D.C voltage only up to

A ) 200-400 V

B ) 600- 800 V

C ) 1000-1200 V

D ) 1700-2000 V

Q no 4 . Normally, which of the following is used,when large -scale conversion from A.C to D.C power is required?

A ) Motor generator set

B ) Motor converter 

C ) rotary converter 

D ) Mercury arc rectifier 

Q no 5 . A rotary converter operates at a 

A ) low power factor 

B ) high power factor 

C ) zero power factor 

D ) none of the above 

Q no 6 . Which of the following A.C motor is usually used in large motor - generator sets ?

A ) synchronous motor 

B ) squirrel cage induction motor 

C ) slip ring induction motor 

D ) any of the above 

Q no 7. In