Electrical Engineering MCQs

Page No. 9

A dynamo converts______________?


amechanical energy into electrical energy


belectrical energy into mechanical energy


cmagnetic energy into mechanical energy


dmagnetic energy into electrical energy



cmf generated by A.C dynamo depends upon_____________?


anumber of turns in the coil


bmagnetic field strength


cfrequency of rotation


d all of above


View Answer all of above

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


aA.C current


bD.C current


cinduced current


dmean square current


View Answer induced current

The practical illustration of the phenomenon of mutual induction is____________?


aA.C generator


bD.C dynamo


cinduction coil


dtransformer


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


b5.97 V


c6 V


d 597 mV


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


b4,591 Hz


c999 Hz


d2,176 Hz


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


b1,250 Hz


c564 Hz


d 5,644 Hz


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


b633 kHz


c331 kHz


d60 kHz


View Answer 633 kHz

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


a0 Hz to 3.5 kHz


b0 Hz


c3.5 kHz


d7 kHz


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


b161 µF


c0.161 µF


d220 µF


View Answer 0.161 µF

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