A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR
A:
is forward biased
B:
is reverse biased
C:
may be forward biased or reverse biased
D:
forward biased initially but reverse biased afterwards
Answer:B
Free wheeling diode is forward biased only when SCR is reverse biased.
Discuss About this Question.
A single phase series converter is used for
A:
high voltage output
B:
high current output
C:
high voltage and high current output
D:
improving the circuit efficiency
Answer:A
Series connection increases the voltage.
Discuss About this Question.
A thyristor is reverse biased. A positive gate pulse is applied. The thyristor
A:
will be turned on
B:
may or may not turn on
C:
will not turn on
D:
will turn on after sometime
Answer:C
Thyristor can turn on only when it is forward biased.
Discuss About this Question.
In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160°. The line to line output voltage would be
A:
400 V
B:
about 100 V
C:
about 20 V
D:
zero
Answer:D
In a three-phase full wave regulator, output voltage is zero if a ≥ 150°.
Discuss About this Question.
Ad Slot (Above Pagination)
Install ExamAdept
Fast access — add this app to your device.
To install on iPhone/iPad: tap Share → Add to Home Screen.
Discuss About this Question.