Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): Doping level in extrinsic semiconductors is very small.

Reason (R): Additional of impurity in the ratio of 1 part in 108 parts increases the number of charge carriers by about 20.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A
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Some ceramic materials become superconducting
A:
below liquid helium temperature
B:
between liquid helium and liquid nitrogen temperature
C:
above liquid nitrogen but below room temperature
D:
at room temperature
Answer: A
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Consider the following statements
  1. An iron cored choke is non linear and passive device.
  2. A carbon resistor kept in sunlight is a time invariant and passive device.
  3. A dry cell is a time varying and active device.
  4. An air capacitor is time invariant and passive device.
Of these statements
A:
1, 2, 3 and 4 are correct
B:
1, 2, 3 are correct
C:
1, 2, 4 are correct
D:
2 and 4 are correct
Answer: A
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For an insulating material, dielectric strength and dielectric losses should be
A:
high and high
B:
low and high
C:
high and low
D:
low and low
Answer: C

An insulating material should have high dielectric strength and low losses.

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An electron in a metal suffers collision and if the probability of it being scattered over an angle dθ is 2p P(θ) sin θ dθ where P(θ) is an arbitrary function of scattering angle θ, then
A:
2pP(θ) sin θ dθ = 0
B:
2pP(θ) sin θ dθ = 2
C:
2pP(θ) sin θ dθ = -1
D:
2pP(θ) sin θ dθ = 1
Answer: C
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