Which of following is not a power transistor?
Which of following is not a power transistor?
A. IGBTs
B. COOLMOS
C. TRIAC
D. SITS
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Spread time is defined as the interval during which_____________?
Spread time is defined as the interval during which_____________?A. anode voltage drops from 10 % of its initial value to zero
B. anode current rises from 90 % to its final value
C. both (A) and (B)
D. anode current rises from 10 % to 90 % of its final valueWith increase in firing angle,
With increase in firing angle,A. Both harmonic distortion and quality of input current increases
B. Harmonic distortion increases and quality of input current decreases
C. Harmonic distortion decreases and quality of input current increases
D. Both harmonic distortion and quality of input current decreasesThe switching function of semiconductor devices can be characterized with____________?
The switching function of semiconductor devices can be characterized with____________?A. Duty ratio only
B. Frequency only
C. Duty ratio and frequency
D. Duty ratio, frequency and time delayIn a three phase voltage source inverters____________?
In a three phase voltage source inverters____________?A. Only amplitude of voltage is controllable
B. Only phase is controllable
C. Both amplitude and phase is controllable
D. Amplitude, phase and frequency of voltages should always be controllableIf the firing angle becomes negative, then the rectifier begins to work as_______________?
If the firing angle becomes negative, then the rectifier begins to work as_______________?A. A rectifier
B. An inverter
C. A chopper
D. A regulatorIf energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?
If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?A. Motoring mode operation
B. Braking mode operation
C. Regenerative mode operation
D. None of these