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MCQs 1: In a load commutated DC – DC chopper, the capacitor has a_____________?

Symmetric triangular voltage across itself Symmetric rectangular voltage across itself Symmetric trapezoidal voltage across itself Symmetric sinusoidal voltage across itself
Answer Explanation

MCQs 2: The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?

Phase current Three times the phase current Three times the line current Zero at all times
Answer Explanation

MCQs 3: In current commutated DC-DC choppers, the voltage spike appears across the load when_____________?

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

MCQs 4: For power output higher than 15 kW, the suitable rectifier is________________?

Single phase 3 phase Poly phase Only (b) and (c)
Answer Explanation

MCQs 5: In a full wave rectifier, the rectification ratio is approximately equal to____________?

61% 71% 81% 91%
Answer Explanation

MCQs 6: LISN is a device used to measure conducted emissions. LISN stands for_____________?

Line integrated stabilization network Line impedance stabilization network Line integrated stored network Laser integrated stabilization networking
Answer Explanation

MCQs 7: In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______________?

V m 2 V m V m / 2 4 V m
Answer Explanation

MCQs 8: A single phase ac – dc converter is also known as____________?

rectifier inverter chopper regulator
Answer Explanation

MCQs 9: The output power of the cascaded amplifier / attenuator system can be determined using___________?

Actual gain of amplifier Actual gain of amplifier and attenuator Gain in dB of amplifier and attenuator Actual gain of attenuator
Answer Explanation

MCQs 10: If the gate voltage of an SCR is removed, then the_______________?

anode current decreases anode current does not decrease at all anode current increases cathode current increases
Answer Explanation

MCQs 11: Anode of an operational SCR is _______________?

Always positive w.r.t cathode Always negative w.r.t anode Always positive w.r.t anode Always negative w.r.t cathode
Answer Explanation

MCQs 12: 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 13: In a silicon controlled rectifier, the load is connected___________?

Across anode In series with anode Across cathode In series with cathode
Answer Explanation

MCQs 14: 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 15: Number of PN junction in an SCR is____________?

Two Three Four Five
Answer Explanation

MCQs 16: 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 17: IGBT stands for___________?

Insulated gate bipolar transistor Insulated gate bidirectional transistor Inductive gate bipolar transistor Inductive gate bidirectional transistor
Answer Explanation

MCQs 18: 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 19: An ideal switch is___________?

Lossless Carry current in any direction when it is on Does not carry any current in any direction when it is off All of these
Answer Explanation

MCQs 20: In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?

Zero Non zero Equal to the sum of voltage when switch is open Twice of the voltage when switch is open
Answer Explanation

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