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MCQs 1: For similar carrier and modulating signals, the line current used in CSI is_____________?

Identical to line voltage in a VSI Identical to line current in VSI Identical to phase voltage in VSI Identical to phase voltage in CSI
Answer Explanation

MCQs 2: During the commutation period in 3 phase converter, overlap time is____________?

Dependent on the load current Dependent on the voltage Dependent on both the load current and load voltage behind the short circuit current Independent on both the load current and load voltage
Answer Explanation

MCQs 3: The effects of EMI can be reduced by_____________?

Suppressing emissions Reducing the efficiency of the coupling path Reducing the susceptibility of the receptor All of these
Answer Explanation

MCQs 4: An SCR is made up of silicon because_____________?

silicon has large leakage current than germanium silicon has small leakage current than germanium silicon has small leakage voltage than germanium silicon has large leakage voltage than germanium
Answer Explanation

MCQs 5: AC power in a load can be controlled by using_____________?

two SCR’s in parallel opposition two SCR’s in series three SCR’s in series four SCR’s in series
Answer Explanation

MCQs 6: The switching function of semiconductor devices can be characterized with____________?

Duty ratio only Frequency only Duty ratio and frequency Duty ratio, frequency and time delay
Answer Explanation

MCQs 7: Electrical power output in a D.C. generator is equal to_____________?

Electrical power developed in armature – copper losses Mechanical power input – iron and friction losses Electrical power developed in armature – iron and copper losses Mechanical power input – iron and friction losses – copper losses
Answer Explanation

MCQs 8: If a shunt motor is started with its field winding open then___________?

It will rotate at the same speed as that with its field winding closed It will rotate at less speed as that with its field winding closed It will rotate at dangerously high speed None of these
Answer Explanation

MCQs 9: The power demand can be estimated approximately by____________?

Load survey method Mathematical method Statistical method Economic parameters
Answer Explanation

MCQs 10: Power electronics essentially deals with control of a.c. power at____________?

Frequencies above 20 kHz Frequencies above 1000 kHz Frequencies less than 10 Hz 50 Hz frequency
Answer Explanation

MCQs 11: In a push – pull converter, the filter capacitor can be obtained as____________?

Cmin = V / ( Vr L f2 ) Cmin= ( 1 – D ) V / ( Vr L f2 ) Cmin= ( 1 – 2 D ) V / 32 ( Vr L f2 ) Cmin= ( 1 – 2 D ) V / 42 ( Vr L f2 )
Answer Explanation

MCQs 12: MOSFET stands for______________?

Metal – oxide semiconductor field effect transistor Molybdenum – oxide semiconductor field effect transistor Metal – oxide silicon field effect transistor Metal – oxide semiconductor field effect transmitter
Answer Explanation

MCQs 13: In a flyback converter, the inductor of the buck-boost converter has been replaced by a_____________?

Flyback capacitor Flyback resistor Flyback transformer Flyback transistor
Answer Explanation

MCQs 14: Advantages of Cuk converter is / are_____________?

Large number of reactive component Low stress on switch Low stress on capacitor None of these
Answer Explanation

MCQs 15: A MOSFET, for its conduction uses_____________?

Only minority carriers Only majority carriers Both minority and majority carriers None of these
Answer Explanation

MCQs 16: An RC snubber network used in BJT__________?

Divert the collector current during turn – off Improves the reverse bias safe operating area Dissipates a fair amount of switching power All of these
Answer Explanation

MCQs 17: The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?

High dv / dt, low di / dt Low dv / dt, low di / dt Low dv / dt, high di / dt High dv / dt, high di / dt
Answer Explanation

MCQs 18: If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?

Motoring mode operation Braking mode operation Regenerative mode operation None of these
Answer Explanation

MCQs 19: A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?

Boost single – phase power factor converter A buck dc – dc converter to reduce ripple in the intermediate dc bus capacitor Both A. and B. None f these
Answer Explanation

MCQs 20: Regulator sampling PWM is usually used in___________?

High power inverters Rectifiers Low power inverters Only A. and B.
Answer Explanation

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