An ideal switch is___________?

Related Mcqs:

1. 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?

   A. 76.3 %
   B. 91.6 %
   C. 83.3 %
   D. 90.9 %

2. An ideal diode is___________?

   A. Unidirectional
   B. Bidirectional
   C. Fixed voltage polarity
   D. Only (a) and (c)

3. In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?

   A. Zero
   B. Non zero
   C. Equal to the sum of voltage when switch is open
   D. Twice of the voltage when switch is open

4. The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is___________?

   A. 130 μs
   B. 135 μs
   C. 140 μs
   D. 145 μs

5. The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is___________?

   A. Sine wave
   B. Square wave
   C. Saw – tooth wave
   D. Trapezoidal wave

6. Bidirectional semiconductor device is___________?

   A. Diode
   B. BJT
   C. SCR
   D. TRIAC

7. In the SPWM, the modulating signal is___________?

   A. Square
   B. Sinusoidal
   C. Triangular
   D. Saw – tooth

8. The opposite of susceptibility is___________?

   A. Immunity
   B. Emission
   C. Interference
   D. Electromagnetic compatibility

9. The typical value of SCR for modern alternator is____________?

   A. 1.5.
   B. 0.5.
   C. 1.0.
   D. 1.2.

10. BCT is used for____________?

    A. High power phase control
    B. High power current control
    C. Low power current control
    D. Low power phase control