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.Management Sciences
Category: Power Electronics
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
Choppers is a_______________?
A. AC – DC converters
B. AC – AC converters
C. DC – AC converters
D. DC – DC converters
In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output
A. Zero
B. Switches between – 1 / 2 and + 1 / 2
C. Switches between – 1 and + 1
D. Switches between 0 and + 1
Any electrical signal present in a circuit other than the desired signal is known as______________?
A. Noise
B. Distortion
C. Interference
D. All of these
DIAC and TRIAC both are semiconductors devices and conduct in____________________?
A. DIAC conducts in forward direction and TRIAC conducts in reverse direction
B. Both conducts in forward direction
C. Both conducts in reverse direction
D. Both conducts in either direction
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