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.Management Sciences
Category: Power Electronics
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
Materials used in heat sink should have_____________?
A. high thermal conductivity
B. large surface area
C. high melting point
D. All of these
AC power in a load can be controlled by using_____________?
A. two SCR’s in parallel opposition
B. two SCR’s in series
C. three SCR’s in series
D. four SCR’s in series
What may happen high dV / dt____________?
A. Unwanted turn ON
B. Breakdown of J2 junction
C. Both A and B
D. Anyone of these
The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?
A. Susceptibility
B. Emission
C. Interference
D. Electromagnetic compatibility
Single phase VSI are mainly used in___________?
A. Power supplies
B. Ups
C. Multilevel configuration
D. All of these
Under harmonic free load voltages, the 3 phase VSI_____________?
A. Does not contains second harmonic
B. Does not contains third harmonic
C. Does not contains fifth harmonic
D. Does not contains seventh harmonic
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
The transfer function of PWM is generally developed in______________?
A. Time domain
B. Frequency domain
C. Either A. or B.
D. None of these
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