Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?
A. 1
B. 01
C. 10
D. 02
Answer» E.
Discussion
2.

An oscillator produces___________oscillations?
A. Damped
B. Undamped
C. Modulated
D. None of the above
Answer» C. Modulated
Discussion
3.

In an LC transistor oscillator, the active device is___________?
A. LC tank circuit
B. Biasing circuit
C. Transistor
D. None of the above
Answer» D. None of the above
Discussion
4.

If the crystal frequency changes with temperature, we say that crystal has___________temperature coefficient?
A. Positive
B. Zero
C. Negative
D. None of the above
Answer» B. Zero
Discussion
5.

An LC oscillator cannot be used to produce ____________frequencies?
A. High
B. Audio
C. Very low
D. Very high
Answer» D. Very high
Discussion
6.

An oscillator employs___________feedback?
A. Positive
B. Negative
C. Neither positive nor negative
D. Data insufficient
Answer» B. Negative
Discussion
7.

In a phase shift oscillator, we use____________RC sections?
A. Two
B. Three
C. Four
D. None of the above
Answer» C. Four
Discussion
8.

____________is a fixed frequency oscillator?
A. Phase-shift oscillator
B. Hartely-oscillator
C. Colpitt’s oscillator
D. Crystal oscillator
Answer» E.
Discussion
9.

The application where one would most likely find a crystal oscillator is____________?
A. Radio receiver
B. Radio transmitter
C. AF sweep generator
D. None of the above
Answer» C. AF sweep generator
Discussion
10.

For an oscillator to properly start, the gain around the feedback loop must initially be_________?
A. 1
B. Greater than 1
C. Less than 1
D. Equal to attenuation of feedback circuit
Answer» C. Less than 1
Discussion
11.

In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?
A. Remains the same
B. Decreases
C. Increases
D. Insufficient data
Answer» D. Insufficient data
Discussion
12.

The Q of the crystal is of the order of____________?
A. 100
B. 1000
C. 50
D. More than 10,000
Answer» E.
Discussion
13.

A second condition for oscillations is____________?
A. A gain of 1 around the feedback loop
B. No gain around the feedback loop
C. The attention of the feedback circuit must be one-third
D. The feedback circuit must be capacitive
Answer» B. No gain around the feedback loop
Discussion
14.

An oscillator differs from an amplifier because it_____________?
A. Has more gain
B. Requires no input signal
C. Requires no d.c. supply
D. Always has the same input
Answer» C. Requires no d.c. supply
Discussion
15.

The piezoelectric effect in a crystal is___________?
A. A voltage developed because of mechanical stress
B. A change in resistance because of temperature
C. A change in frequency because of temperature
D. None of the above
Answer» B. A change in resistance because of temperature
Discussion
16.

In an LC circuit, when the capacitor is maximum, the inductor energy is____________?
A. Minimum
B. Maximum
C. Half-way between maximum and minimum
D. None of the above
Answer» B. Maximum
Discussion
17.

A Wien bridge oscillator uses___________feedback?
A. Only positive
B. Only negative
C. Both positive and negative
D. None of the above
Answer» D. None of the above
Discussion
18.

Quartz crystal is most commonly used in crystal oscillators because:____________?
A. It has superior electrical properties
B. It is easily available
C. It is quite inexpensive
D. None of the above
Answer» B. It is easily available
Discussion
19.

In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?
A. Increased 2 times
B. Decreased 4 times
C. Increased 4 times
D. Decreased 2 times
Answer» E.
Discussion
20.

The signal generator generally used in the laboratories is___________oscillator?
A. Wien-bridge
B. Hartely
C. Crystal
D. Phase shift
Answer» B. Hartely
Discussion
21.

An important limitation of a crystal oscillator is____________?
A. Its low output
B. Its high Q
C. Less availability of quartz crystal
D. Its high output
Answer» B. Its high Q
Discussion
22.

In Colpitt’s oscillator, feedback is obtained___________?
A. By magnetic induction
B. By a tickler coil
C. From the centre of split capacitors
D. None of the above
Answer» D. None of the above
Discussion
23.

One condition for oscillation is_____________?
A. A phase shift around the feedback loop of 180o
B. A gain around the feedback loop of one-third
C. A phase shift around the feedback loop of 0o
D. A gain around the feedback loop of less than 1
Answer» D. A gain around the feedback loop of less than 1
Discussion
24.

An oscillator converts __________?
A. power into d.c. power
B. power into a.c. power
C. mechanical power into a.c. power
D. none of the above
Answer» C. mechanical power into a.c. power
Discussion
25.

Hartley oscillator is commonly used in______________?
A. Radio receivers
B. Radio transmitters
C. TV receivers
D. None of the above
Answer» B. Radio transmitters
Discussion
26.

In an LC oscillator, the frequency of oscillator is____________L or C?
A. Proportional to square of
B. Directly proportional to
C. Independent of the values of
D. Inversely proportional to square root of
Answer» E.
Discussion
27.

In a phase shift oscillator, the frequency determining elements are _______________?
A. L and C
B. R, L and C
C. R and C
D. None of the above
Answer» D. None of the above
Discussion
28.

The crystal oscillator frequency is very stable due to___________of the crystal?
A. Rigidity
B. Vibrations
C. Low Q
D. High Q
Answer» E.
Discussion