Switching frequency of SITH is____________?

Related Mcqs:

1. SITH is also known as___________?

   A. Filled controlled diode
   B. Filled controlled rectifier
   C. Silicon controlled rectifier
   D. None of these

2. 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

3. For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would

   A. Decrease with frequency
   B. Remains same with change in frequency
   C. Increase with frequency
   D. Either A. or B.

4. 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 delay

5. 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 these

6. The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?

   A. Uninterruptible power supplies
   B. Induction heating system
   C. Constant voltage and frequency power supplies
   D. All of these

7. 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 delay

8. 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

9. In variable frequency, PWM gain

   A. Phase lead helps to increase the phase margin of the control loop
   B. Phase lag helps to increase the phase margin of the control loop
   C. Phase lead helps to decrease the phase margin of the control loop
   D. Phase lag helps to decrease the phase margin of the control loop

10. In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?

    A. Multiple of two
    B. Odd multiple of three
    C. Odd multiple of five
    D. Odd multiple of seven