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.Management Sciences
Category: Power Electronics
Delay time is defined by the interval when_______________?
A. gate current increases from 90 % to 100 % of its final value
B. anode current reaches 10 % from forward leakage current
C. anode voltage drops from 100 % to 90 % of its actual value
D. all of these
The power demand can be estimated approximately by____________?
A. Load survey method
B. Mathematical method
C. Statistical method
D. Economic parameters
What is the advantage of HRC fuses over Rewirable fuses?
A. High speed operation
B. High rupturing capacity
C. No ageing effect
D. All of the above
The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as_____________________?
A. both as forward characteristics
B. both as reverse characteristics
C. former as forward characteristics and later as reverse characteristics
D. former as reverse characteristics and later as forward characteristics
Which triggering is the most reliable____________?
A. Forward voltage triggering
B. Gate triggering
C. dV / dt triggering
D. Thermal triggering
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?
A. Turn on
B. Not turn on
C. Turn on if inductance is removed
D. Turn on if pulse frequency us increased to two times
By which one of the following we can measure the reliability of a string_____________?
A. String efficient
B. Reliability factor
C. Factor of safety
D. Derating factor
The output power of the cascaded amplifier / attenuator system can be determined using___________?
A. Actual gain of amplifier
B. Actual gain of amplifier and attenuator
C. Gain in dB of amplifier and attenuator
D. Actual gain of attenuator
The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?
A. Continuous signal
B. Large isolating pulse transformer
C. A train of pulses
D. None of these
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