Top 250+ Solved Power Electronics MCQ Questions Answer
Q. A chopper is a
a. Time ratio controller
b. AC to DC converter
c. DC transformer
d. High speed semiconductor switch
Q. The load voltage of a chopper can be controlled by varying the
a. duty cycle
b. firing angle
c. reactor position
d. extinction angle
Q. AC voltage controllers convert
a. Fixed ac to fixed dc
b. Variable ac to variable dc
c. Fixed ac to variable ac
d. Variable ac to fixed ac
Q. In AC voltage controllers the
a. variable ac with fixed frequency is obtained
b. variable ac with variable frequency is obtained
c. variable dc with fixed frequency is obtained
d. variable dc with variable frequency is obtained
Q. The GTO (gate turn-off thyristor) is a
a. p-n-p-n device
b. p-n-p device
c. p-metal-n device
d. p-n single junction device
Q. The GTO can be turned off
a. by a positive gate pulse
b. by a negative gate pulse
c. by a negative anode-cathode voltage
d. by removing the gate pulse
Q. In GTO The anode current is ideally limited by the
a. gate pulse amplitude
b. internal impedance of the device
c. load Impedance
d. gate circuit impedance
Q. Gold doped GTOs have _____________ as compared to the conventionalGTOs
a. high turn-off time
b. low negative gate current requirement
c. low reverse voltage blocking capabilities
d. lower positive gate current requirement
Q. Latching current for the GTOs is ________ as compared to CTs(Conventional thyristors).
a. more
b. less
c. constant
d. cannot be said
Q. In case of the two-transistor model (T1 & T2) of GTO with anode-short,the anode-short is placed between the
a. emitter of T1 & T2
b. emitter of T1 & base of T2
c. emitter of T1 & base of T1
d. emitter of T1 & collector of T2
Q. Choose the correct statement:GTOs have _________ as compared to the CTs.
a. less on-state voltage drop
b. less gate drive losses
c. higher reverse blocking capabilities
d. faster switching speed