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.Management Sciences
Category: Power Electronics
The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?
A. Phase current
B. Three times the phase current
C. Three times the line current
D. Zero at all times
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ___________?
A. CB
B. Snubber circuit
C. Voltage clamping device
D. Fast acting current limiting device (FACL fuse)
A rectifier with an external low pass filter is an example of______________?
A. Indirect switch matrix circuits
B. Direct switch matrix circuits
C. Embedded converters
D. All of these
In a three phase converter, the number of notches per cycle is____________?
A. One
B. Three
C. Six
D. Nine
A full wave rectifier with resistive load produces___________?
A. Second harmonic
B. Third harmonic
C. Fifth harmonic
D. Do not produce harmonics
The carrier which are commonly used in constant – frequency PWM is______________?
A. Sawtooth carrier
B. Inverted sawtooth carrier
C. Triangle carrier
D. All of these
Double edge modulation eliminates certain harmonics when the reference is a__________?
A. Sine wave
B. Square wave
C. Triangular wave
D. Trapezoidal wave
During reverse recovery time__________________?
A. charge carrier of junction J2 recombined
B. charge carrier of junction J1 is swept out
C. charge carrier of junction J3 is swept out
D. both B and C
IGBT combines the advantages of_____________?
A. BJTs and SITs
B. BJTs and MOSFETs
C. SITs and MOSFETs
D. None of these
Typical range of thyristor turn OFF time is______________?
A. 3 – 10 µs
B. 3 – 50 µs
C. 3 – 100 µs
D. 3 – 500 µs
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