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.Management Sciences
Category: Power Electronics
COOLMOS device can be used in application up to power range of___________?
A. 1 KVA
B. 2 KVA
C. 500 VA
D. 100 KVA
The power MOSFET device is a___________?
A. Current controlled unipolar device
B. Voltage controlled unipolar device
C. Current controlled bipolar device
D. Voltage controlled bipolar device
Maximum di / dt in a SCR is________?
A. Directly proportional to Vm of supply voltage
B. Inversely proportional to Vm of supply voltage
C. Inversely proportional to L in the circuit
D. Both A and C
Which one is most suitable power device for high frequency (>100 KHz) switching application?
A. BJT
B. Power MOSFET
C. Schottky diode
D. Microwave transistor
The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?
A. Directly proportional to their harmonic order
B. Inversely proportional to their harmonic order
C. Not related to their harmonic order
D. None of these
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
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