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.Management Sciences
Category: Power Electronics
For a buck converter to reduce the conduction losses in diode
A. A high on – resistance switch can be added in parallel
B. A low on – resistance switch can be added in parallel
C. A high on – resistance switch can be added in series
D. A low on – resistance switch can be added in series
How can we protect SCR from thermal conditions _____________?
A. Use of snubber circuit.
B. Using heat sink.
C. Using CB and fuse.
D. Using equalizing circuit
In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?
A. Zero
B. Non zero
C. Equal to the sum of voltage when switch is open
D. Twice of the voltage when switch is open
The man made noise sources is / are_____________?
A. Motors
B. Switches, radio interferences
C. Computers, digital electronics
D. All of these
Power electronics essentially deals with control of a.c. power at____________?
A. Frequencies above 20 kHz
B. Frequencies above 1000 kHz
C. Frequencies less than 10 Hz
D. 50 Hz frequency
Gate circuit or triggering circuit of a thyristor is
A. lower power circuit.
B. high power circuit.
C. magnetic circuit.
D. may be low power or high power circuit
The ac voltage controller can be used for ___________?
A. Lighting and heating control
B. On – line transformer tap changing
C. Soft starting
D. All of these
The main objective of static power converters is to____________?
A. Obtain an dc output waveform from a dc power supply
B. Obtain an ac output waveform from a dc power supply
C. Obtain an dc output waveform from a dc power supply
D. Obtain an ac output waveform from a ac power suppl
In a square – wave operation of 3 phase CSIs, the power values are on for___________?
A. 60 degree
B. 90 degree
C. 120 degree
D. 150 degree
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