Thermal voltage VT can be given by____________?

Related Mcqs:

1. A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is_____?

   A. 0.32 B. 0.67 C. 0.45 D. 0.27...

2. Under over voltage condition impedance offered by the voltage clamping device is__________?

   A. low B. High C. moderate D. infinity...

3. The average value of the output voltage in a step – down dc chopper is given by__________?

   A. V 0 = V s B. V 0 = D V s C. V 0 = V s / D D. V 0 = V s / ( 1 – D )...

4. The effects of EMI can be reduced by____________?

   A. Suppressing emissions B. Reducing the efficiency of the coupling path C. Reducing the susceptibility of the receptor D. All of these...

5. The power demand can be estimated approximately by____________?

   A. Load survey method B. Mathematical method C. Statistical method D. Economic parameters...

6. How can we protect SCR from thermal conditions _____________?

   A. Use of snubber circuit. B. Using heat sink. C. Using CB and fuse. D. Using equalizing circuit...

7. In current commutated DC-DC choppers, the voltage spike appears across the load when_____________?

   A. Voltage across the commutating inductances collapses B. The capacitance voltage adds to the supply voltage C. Both A. and B. D. None of these...

8. The on – state voltage drop of IGBT consists of__________?

   A. Drop across the collector junction B. Drop across the drift region C. Drop across MOSFET portion D. All of these...

9. The ac voltage controller can be used for ___________?

   A. Lighting and heating control B. On – line transformer tap changing C. Soft starting D. All of these...

10. The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?

    A. High dv / dt, low di / dt B. Low dv / dt, low di / dt C. Low dv / dt, high di / dt D. High dv / dt, high di / dt...