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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 3
31.
Thermistor is used in
temperature measurement
temperature control
high temperature alarm circuits of devices
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Nichrome is used for
overhead line wires
heater coils
lamp filaments
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
The electric dipole moment of a neutral system of point charges Q1, Q2.... is Qiri . The charges Qi
must be all positive
must be all negative
must be such that Qi = 0
either (a) or (b)
Answer: Option
Explanation:

The system is neutral and hence sum is zero.

34.
The class of insulation of impregnated paper is
A
B
C
F
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.

Assertion (A): The resistance of a copper specimen changes by about 22% when temperature is increased from room temperature to 700°C.

Reason (R): The physical properties of a material are determined mostly by the extent of impurities.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

The increase of resistance with temperature is governed by temperature coefficient of resistance.

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