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.Management Sciences
Category: Power Electronics
After proper turn on of thyristor____________?
A. gate signal is always present
B. gate signal must be removed
C. gate signal should present but can be removed
D. none of the above.
An ideal switch is___________?
A. Lossless
B. Carry current in any direction when it is on
C. Does not carry any current in any direction when it is off
D. All of these
A Triac is a ______________?
A. 2 terminal switch
B. 2 terminal bilateral switch
C. 3 terminal bilateral switch
D. 3 terminal bidirectional switch
The conduction losses in IGBT is____________?
A. More than that of MOSFET
B. Lower than that of MOSFET
C. Equal to that of MOSFET
D. Equal to that of BJT
What is used to protect the SCR from over current ________________?
A. CB and fuse.
B. Heat sink.
C. Snubber circuit.
D. Voltage clamping device.
Which following is a two terminal three layer device?
A. BJT
B. Power dioed
C. MOSFET
D. None of above
In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?
A. Multiple of two
B. Odd multiple of three
C. Odd multiple of five
D. Odd multiple of seven
A TRIAC can be turned on with______________?
A. Positive voltage at the gate terminal
B. Negative voltage at the gate terminal
C. Either (a) or (b)
D. None of these
For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?
A. Three inductances
B. Three capacitances
C. Three resistance
D. Three transistors
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