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Electronics and Communication Engineering
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Materials and Components
See What Others Are Saying!
Question
A material which is lightly repelled by a magnetic field is known as
Options
A. diamagnetic material
B. non-magnetic material
C. ferromagnetic material
D. paramagnetic material
Correct Answer
diamagnetic material
More questions
1. Which power amplifier can deliver maximum load power?
Options
A. Class A
B. Class AB
C. Class B
D. Class C
Show Answer
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Discuss
Correct Answer: Class C
Explanation:
Since efficiency of class C operation is high, maximum load power is delivered.
2. The attraction between the nucleus and valence electron of copper atom is
Options
A. zero
B. weak
C. strong
D. either zero or strong
Show Answer
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Discuss
Correct Answer: weak
Explanation:
The valence electron, in copper atom, can be easily detached from nucleus.
3. Wood is a diamagnetic material.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
4. In a receiver, which of the following device has RF input but IF output?
Options
A. Loudspeaker
B. Frequency changer
C. Demodulator
D. Audio amplifier
Show Answer
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Discuss
Correct Answer: Frequency changer
5. Fidelity of a receiver represents
Options
A. the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output
B. the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies
C. the variation of the output with the modulation frequency when the output impedance is a resistance
D. none of the above
Show Answer
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Discuss
Correct Answer: the variation of the output with the modulation frequency when the output impedance is a resistance
6. As per BIS there are 6 accuracy classes of instruments.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
Explanation:
There are 8 classes of accuracy as per BIS.
7. In superheterodyne receivers, the local oscillator is used to
Options
A. detect the modulating signal
B. amplify the received modulated carrier
C. shift the frequency of the received modulated carrier to the IF band
Show Answer
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Discuss
Correct Answer: shift the frequency of the received modulated carrier to the IF band
8. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is
Options
A. 5870
B. 3655
C. 236
D. 13.3
Show Answer
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Correct Answer: 236
9. A dynamometer wattmeter is connected in ac circuit. The reading will be
Options
A. V-A product
B. average power
C. peak power
D. instantaneous power
Show Answer
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Discuss
Correct Answer: average power
Explanation:
Wattmeter measures average power over a cycle.
10. In an R-C series circuit excited by a voltage E, the charge across capacitor at
t
= 0
+
is
Options
A. 0
B. CE
C. CE (1 -
e
-
t
/RC
)
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 0
Explanation:
Voltage across a capacitor cannot change instantaneously.
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