Power Electronics MCQ Quiz - Multiple Choice Questions & Answers Page 5

41. The advantage of using free - wheeling diode in half controlled bridge converter is that

1. There is always a path for the ac current independent of the ac line
2. There is always a path for the dc current dependent of the ac line
3. There is always a path for the dc current independent of the ac line
4. There is always a path for the ac current independent of the ac line

42. The conduction losses in IGBT is

1. Lower than that of MOSFET
2. Equal to that of MOSFET
3. More than that of MOSFET
4. Equal to that of BJT

43. The device that does not have the gate terminal is ............................

1. FET
2. SCR
3. Triac
4. Diac

44. The device that exhibits negative resistance region is .........................

1. Triac
2. Transistor
3. Diac
4. UJT

45. The effects of EMI can be reduced by

1. Reducing the efficiency of the coupling path
2. Reducing the susceptibility of the receptor
3. Suppressing emissions
4. All of these

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

1. Square wave
2. Saw - tooth wave
3. Sine wave
4. Trapezoidal wave

47. The most suited gate pulses given to the AC regulator with R - L load can be in the form of

1. Large isolating pulse transformer
2. A train of pulses
3. Continuous signal
4. None of these

48. The normal way to turn on a diac is by ...........................

1. Gate voltage
2. Breakover voltage
3. Gate current
4. None of the above

49. The output power of the cascaded amplifier-attenuator system can be determined using

1. Actual gain of amplifier and attenuator
2. Gain in dB of amplifier and attenuator
3. Actual gain of amplifier
4. Actual gain of attenuator

50. The power MOSFET device is a

1. Voltage controlled unipolar device
2. Current controlled bipolar device
3. Current controlled unipolar device
4. Voltage controlled bipolar device