Materials And Components MCQ Questions & Answers

91

Which of the following properties is not correct for a superconductor in its superconducting stage?

A) Its resistivity is zero B) Magnetic flux density inside the conductor is zero C) Its relative permeability is unity D) Its magnetic susceptibility is unity

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Answer & Solution

Answer: Option C

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92

Which one of the following statements is not correct regarding the features of ceramics?

A) Ceramics are hard, strong and dense B) Ceramics are stronger in compression than in tension C) Ceramics have very poor dielectric properties D) Ceramics are weak in impact strength

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Answer & Solution

Answer: Option C

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93

Ferromagnetic property may be explained on the basis of

A) Faraday's theory B) Curie-Weiss theory C) Domain theory D) Einstein's theory

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Answer & Solution

Answer: Option C

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94

For an insulating material, dielectric strength and dielectric loss should be respectively

A) high and high B) low and high C) high and low D) low and low

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Answer & Solution

Answer: Option C

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95

Susceptibility of a diamagnetic material is
1. Negative
2. Positive
3. Dependent of the temperature
4. Independent of temperature
Select the correct answer using the options given below:

A) 1 and 3 B) 2 and 4 C) 1 and 4 D) 2 and 3

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Answer & Solution

Answer: Option C

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96

If the temperature of a semiconductor material is increases, the number of free electrons

A) Decreases B) Increases C) Become zero D) Remains the same E) Doubles

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Answer & Solution

Answer: Option B

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97

The minimum cation-to-anion radius ratio for the coordination number 3 is

A) 0.175 B) 0.155 C) 0.135 D) 0.115

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Answer & Solution

Answer: Option B

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98

Which one of the following is the correct statement? The orientational polorizability in a polyatomic gas is proportional to-

A) temperature T B) $$\frac{1}{{\text{T}}}$$ C) T² D) independent of T

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Answer & Solution

Answer: Option B

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99

Ferromagnetic materials are those which

A) cannot be polarized B) have a permanent polarization C) have α_e equal to zero D) have µ_p equal to zero

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Answer & Solution

Answer: Option B

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100

Consider the following statements regarding electrical properties of ceramic materials:
1. They are practically non-conductors at lower temperatures.
2. Ordinary glass and silicates in molten state are dependable as electrical non-conductors.
3. They offer high resistance to current transmission and get heated soon when conducting electric current.
Which of the above statements are correct?

A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2 and 3

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Answer & Solution

Answer: Option B

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Materials And Components MCQ Questions & Answers | ECE