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Mechanical Engineering Mcqs

Mechanical Engineering Mcqs

Electronics & Electrical Mcqs

Electronics & Electrical Mcqs

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Q:

Solids do not have which type of polarisation?

A) Ionic B) Orientational
C) Interfacial D) Electronic
 
Answer & Explanation Answer: C) Interfacial

Explanation: Solids possess permanent dipole moments. Moreover they do not have junction like semiconductors. Thus, solids neglect the interfacial and space charge polarisation. They possess only electronic, ionic and orientational polarisations.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

2
Q:

In the given types of polarisation, which type exists in the semiconductor?

A) Electronic B) Ionic
C) Orientational D) Interfacial or space charge
 
Answer & Explanation Answer: D) Interfacial or space charge

Explanation: The interfacial type of polarisation occurs due to accumulation of charges at the interface in a multiphase material. This interface or junction is found in a semiconductor material.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

2
Q:

The total polarisation of a material is the

A) Product of all types of polarisation B) Sum of all types of polarisation
C) Orientation directions of the dipoles D) Total dipole moments in the material
 
Answer & Explanation Answer: B) Sum of all types of polarisation

Explanation: The total polarisation of a material is given by the sum of electronic, ionic, orientational and interfacial polarisation of the material.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

3
Q:

In isotropic materials, which of the following quantities will be independent of the direction?

A) Permittivity B) Permeability
C) Polarisation D) Polarizability
 
Answer & Explanation Answer: A) Permittivity

Explanation: Isotropic materials are those with radiate or absorb energy uniformly in all directions (eg. Isotropic antenna). Thus it is independent of the direction.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

3
Q:

Calculate the polarisation vector in air when the susceptibility is 5 and electric field is 12 units.

A) 3 B) 2
C) 60 D) 2.4
 
Answer & Explanation Answer: C) 60

Explanation: The polarisation vector is given by, P = ε0 x χe x E, where χe = 5 and ε0 = 12. On substituting, we get P = 1 x 5 x 12 = 60 units.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

3
Q:

Identify which type of polarisation depends on temperature.

A) Electronic B) Ionic
C) Orientational D) Interfacial
 
Answer & Explanation Answer: C) Orientational

Explanation: The electronic, ionic and interfacial polarisation depends on the atoms which are independent with respect to temperature. Only the orientational polarisation is dependent on the temperature and is inversely proportional to it.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

2
Q:

Calculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units.

A) 1.77 B) 2.25
C) 36 D) 144
 
Answer & Explanation Answer: C) 36

Explanation: The energy stored per unit volume in a dielectric medium is given by, W = 0.5 X PE = 0.5 X 9 X 8 = 36 units.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

2
Q:

Polarizability is defined as the

A) Product of dipole moment and electric field B) Ratio of dipole moment to electric field
C) Ratio of electric field to dipole moment D) Product of dielectric constant and dipole moment
 
Answer & Explanation Answer: B) Ratio of dipole moment to electric field

Explanation: Polarizability is a constant that is defined as the ratio of elemental dipole moment to the electric field strength.

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Category: Electronics & Electrical MCQs
Sub Category: Electromagnetic Theory Mcqs

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