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.Management Sciences
Category: Electrical Engineering Mcqs
By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
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A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer
The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?
A. 20,000 Ω
B. 100,000 Ω
C. 200,000 Ω
D. 1,000,000 Ω
The oscillations in a synchronous motor can be damped out by_______________?
A. maintaining constant excitation
B. running the motor on leading power factors
C. providing damper bars in the rotor pole faces
D. oscillations cannot be damped
With feed back __________ reduces?
A. system stability
B. system gain
C. system stability and gain
D. none of the above
An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit’s critical frequency is___________?
A. 333 kHz
B. 633 kHz
C. 331 kHz
D. 60 kHz
The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as_______________?
A. ablation
B. radiation
C. viscous dissipation
D. irradiation
Which of the following motors has highest starting torque ?
A. Repulsion motor
B. Shaped pole motor
C. Capacitor-start motor
D. Split-phase motor
An ammeter should have_____________ resistance?
A. Infinite
B. Very large
C. Very low
D. None of the above
is an element used in semiconductors whose atoms have three valence electrons?
A. An acceptor
B. A donor
C. Germanium
D. Silicon
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