Power Electronics Test Questions Start Creating PDF

MCQ: Voltage commutation circuit can be converted into a current commutation by interchanging the positions of

1. Diode and capacitor
2. Capacitor and SCR
3. Inductor and capacitor
4. Capacitor and load

MCQ: The switching function of semiconductor devices can be characterized with

1. Duty ratio only
2. Frequency only
3. Duty ratio and frequency
4. Duty ratio, frequency and time delay

MCQ: AC power in a load can be controlled by using

1. two SCR’s in parallel opposition
2. two SCR’s in series
3. three SCR’s in series
4. four SCR’s in series

MCQ: An SCR is made up of silicon because

1. silicon has large leakage current than germanium
2. silicon has small leakage current than germanium
3. silicon has small leakage voltage than germanium
4. silicon has large leakage voltage than germanium

MCQ: The output power of the cascaded amplifier / attenuator system can be determined using

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

MCQ: LISN is a device used to measure conducted emissions. LISN stands for

1. Line integrated stabilization network
2. Line impedance stabilization network
3. Line integrated stored network
4. Laser integrated stabilization networking

MCQ: In current commutated DC-DC choppers, the voltage spike appears across the load when

1. Voltage across the commutating inductances collapses
2. The capacitance voltage adds to the supply voltage
3. Both (a) and (b)
4. None of these

MCQ: In a load commutated DC - DC chopper, the capacitor has a

1. Symmetric triangular voltage across itself
2. Symmetric rectangular voltage across itself
3. Symmetric trapezoidal voltage across itself
4. Symmetric sinusoidal voltage across itself

MCQ: 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

1. Decrease with frequency
2. Remains same with change in frequency
3. Increase with frequency
4. Either (a) or (b)

MCQ: In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance

1. Is equal to the source resistance
2. Greater than the source resistance
3. Smaller than the source resistance
4. None of these