Materials And Components MCQ Questions & Answers

61

Match List-I with List-II and select the correct answer using the options given below:

List-I	List-II
a. No eddy current loss	1. Ferrimagnetic material
b. Small hysteresis	2. Soft magnetic material
c. Large hysteresis	3. Hard magnetic material
	4. Nonferrous material

A) a-2, b-1, c-3 B) a-2, b-3, c-4 C) a-1, b-3, c-4 D) a-1, b-2, c-3

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Answer & Solution

Answer: Option D

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62

If a small amount of Cu is added to a Ni conductor, then the

A) resistivity of Ni will increase at all temperatures because Cu is a better conductor than Ni B) residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres C) resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects D) resistivity of Ni remains unaltered as Cu atoms give the same number of free electrons as Ni atoms

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Answer & Solution

Answer: Option C

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63

Given a ferrite material that we shall specify to be operating in a linear mode with B = 0.05 T, let us assume µ_r = 50, and calculate the approximate value for magnetization M.

A) 41350 A/m B) 39000 A/m C) 34500 A/m D) 40500 A/m

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Answer & Solution

Answer: Option B

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64

Unit of permeability is-

A) Henery/meter B) Henery C) Henery/meter² D) It is dimensionless

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Answer & Solution

Answer: Option A

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65

The transition temperature of Mercury at which it becomes superconductive is

A) 4.12°F B) 4.12°C C) 4.12°K D) 41.2°K

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Answer & Solution

Answer: Option C

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66

Consider the following statements in connection with superconductors:
1. Transition temperature of a superconductor can be reduced by the application of magnetic field.
2. Transition from the superconducting to normal state under the influence of a magnetic field is irreversible.
Which of the statements given above is/are correct?

A) 1 only B) 2 only C) Both 1 and 2 D) Neither 1 nor 2

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Answer & Solution

Answer: Option A

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67

A Type-I superconductor is
1. A conductor of infinite conductivity at all temperature.
2. A conductor with very large conductivity below a critical temperature.
3. A material showing susceptibility = -1 drastically reduced by a critical temperature.
4. A perfect conductor having conductivity drastically reduced by a critical current.
Which of these statements are correct?

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

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Answer & Solution

Answer: Option B

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68

In the superconducting state, the flux lines of a magnetic field are ejected out of the superconductor as per

A) Curie effect B) Faraday's effect C) Maxwell's effect D) Meissner effect

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Answer & Solution

Answer: Option D

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69

The crystal structure of some Ceramic materials may be thought of being composed of electrically charged Cations and Anions, instead of Atoms, and as such

A) The Cations are negatively charged, because they have given up their valence electrons to Anions which are positively charged B) The Cations are positively charged, because they have given up their valence electrons to anions which are negatively charged C) The Cations are positively charged, because they have added one electron to their valence electrons borrowing from Anions which are negatively charged D) The cations are negatively charged, as they are non-metallic where as anion are positively charge being metallic

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Answer & Solution

Answer: Option B

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70

Two ceramic capacitors have the following parameters. One has capacitance C₁ and ceramic thickness d₁. The other has capacitance C₂ and ceramic thickness d₂. When the two are connected in series, the combination has a capacitance of:

A) C = d₁ + d₂ B) $${\text{C}} = \frac{{{{\text{d}}_1}{{\text{d}}_2}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$ C) C = C₁ + C₂ D) $${\text{C}} = \frac{{{{\text{C}}_1}{{\text{C}}_2}}}{{{{\text{C}}_1} + {{\text{C}}_2}}}$$

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Answer & Solution

Answer: Option D

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Materials And Components MCQ Questions & Answers | ECE