Power transistor are type of___________?
Power transistor are type of___________?
A. B.JTs
B. MOSFETs
C. IGBTs
D. All of above
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For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?
For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?A. Three inductances
B. Three capacitances
C. Three resistance
D. Three transistorsIn BJT, switching losses occurs___________?
In BJT, switching losses occurs___________?A. Only at turn – on
B. Only at turn – off
C. Both at turn on and off
D. None of theseA thyristor equivalent of a thyratron tube is a _________?
A thyristor equivalent of a thyratron tube is a _________?A. Diac
B. Triac
C. Silicon controlled-rectifier SCR
D. None of aboveIn a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?
In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?A. Positive
B. Negative
C. Zero
D. None of theseThe maximum di/dt in a SCR is____________?
The maximum di/dt in a SCR is____________?A. Directly proportional to supply voltage
B. Directly proportional to inductance in the circuit
C. Inversely proportional to supply voltage
D. Both A and BThe capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?A. 600 V/µs
B. 800 V/µs
C. 1200 V/µs
D. 1000 V/µs