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UP polytechnic Lecturer (EE) Quiz 28

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Question 1

A full wave rectifier connected to the output terminals of the mains transformer produces an RMS voltage of 18 V across the secondary. The no-load voltage across the secondary of the transformer is

Question 2

Match List I (name of the oscillator) with List II (Characteristics) and select the correct answer using the code given below the list:
List-I
A) Colpitts oscillator
B) phase shift oscillator
C) Tunnel diode oscillator
D) Relaxation oscillator
List-II
1) RC oscillator
2) LC oscillator
3) Negative resistance oscillator
4) Sweep oscillator

Question 3

Which one of the following is correct for an ideal operational amplifier?

Question 4

Statement I : Voltage gain of op-amp decreases at high frequencies

Statement II : Its internal structure uses a capacitor

Question 5

Closed loop current gain(in 10⁶)for an opamp to prevent distortion for an input of [V_i = 2 sin(100t) mV] having slew rate of 1.5 V/μsec will be?

Question 6

Except at high frequencies of switching, nearly all the power dissipated in the switch mode operation of a BJT occurs, when the transistor is in the

Question 7

To generate 2 MHz frequency, the most suitable circuit is

Question 8

Biasing is used in transistor amplifiers to
1) Stabilize the operating point against temperature variations.
2) Place the operating point in the linear region of the characteristics.
3) Make α, β, and I_CO of the transistor independent of temperature variations.
4) Reduce distortion and increases dynamic range.

Question 9

For 555 astable multivibrator, if C = 0.01 μF, R_A = 10 kΩ, R_B = 50 kΩ, the frequency and the duty cycle will be nearly

Question 10

For the circuit shown. Calculate the voltage gain

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AE & JE Exams

Jul 14AE & JE Exams