Explore topic-wise MCQs in Electrical Engineering Mcqs.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Mcqs knowledge and support exam preparation. Choose a topic below to get started.

1.

An amplifier without feedback has a voltage gain of 50,input resistance os 1 K & Output resistance of 2.5K .The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?

A. 1/11K
B. 1/5K
C. 5K
D. 11K
Answer» B. 1/5K
Discussion
2.

. If =0.98 ,Ico=6 A and I =100 A for a transistor,then the value of Ic will be______?

A. 2.3mA
B. 3.2mA
C. 4.6 mA
D. 5.2mA
Answer» E.
Discussion
3.

An npn BJT has gm=38mA/v, c =10 14 F, c =10 13F and DC current gain 0=90.For this transistor fT & f are________?

A. FT =1.64 x 108 Hz & f = 1.47 x 1010 Hz.
B. FT =1.47 x 1010 Hz & f = 1.64 x 108 Hz
C. FT =1.33 x 1012 Hz & f = 1.47 x 1010 Hz
D. FT =1.47 x 1010 Hz & f = 1.33 x 1012 Hz
Answer» C. FT =1.33 x 1012 Hz & f = 1.47 x 1010 Hz
Discussion
4.

An amplifier using an opamp with slew rate SR=1v/ sec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?

A. 795mV
B. 395mV
C. 795 mV
D. 39.5mV
Answer» D. 39.5mV
Discussion
5.

Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1K & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?

A. 49dB
B. 51dB
C. 98dB
D. 102dB
Answer» D. 102dB
Discussion
6.

An OPAMP has a slew rate of 5 V/ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/ S.

A. 10 volts
B. 5 volts
C. 5/1 volts
D. 5/2 volts
Answer» E.
Discussion