Electrical Engineering MCQs

Page No. 9

A dynamo converts______________?


amechanical energy into electrical energy

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belectrical energy into mechanical energy

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cmagnetic energy into mechanical energy

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dmagnetic energy into electrical energy

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cmf generated by A.C dynamo depends upon_____________?


anumber of turns in the coil

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bmagnetic field strength

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cfrequency of rotation

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d all of above

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View Answer all of above

Current produced by moving the loop of wire across a magnetic field is called_____________?


aA.C current

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bD.C current

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cinduced current

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dmean square current

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View Answer induced current

The practical illustration of the phenomenon of mutual induction is____________?


aA.C generator

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bD.C dynamo

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cinduction coil

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dtransformer

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View Answer transformer

In a certain low-pass filter, fc = 3.5 kHz.if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?


a0 V

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b5.97 V

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c6 V

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d 597 mV

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View Answer 5.97 V

A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?


a459 Hz

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b4,591 Hz

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c999 Hz

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d2,176 Hz

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View Answer 4,591 Hz

An RL high-pass filter consists of a 470 Ω resistor and a 600 mH coil. The output is taken across the coil. The circuit’s critical frequency is___________?


a125 Hz

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b1,250 Hz

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c564 Hz

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d 5,644 Hz

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View Answer 125 Hz

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___________?


a333 kHz

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b633 kHz

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c331 kHz

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d60 kHz

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View Answer 633 kHz

In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?


a0 Hz to 3.5 kHz

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b0 Hz

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c3.5 kHz

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d7 kHz

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View Answer 0 Hz to 3.5 kHz

An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?


a81 µF

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b161 µF

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c0.161 µF

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d220 µF

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View Answer 0.161 µF

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