On which of the following factors skin effect depends?

Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called

A

flavoxanthin

B

melanin

C

carotene

D

Xanthophyll

Color of the skin depends on

A

Number of blood vessels in the dermis

B

Color of the blood flowing through blood vessels

C

Number of melanocytes

D

Carotene

E

Nutrition

The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

A

Arc

B

Resistance

C

Low frequency induction

D

High frequency induction

Owing to skin effect

A

Current flows through the half cross-section of the conductor

B

Portion of the conductor near the surface carries more current and core of the conductor carries less current

C

Portion of the conductor near the surface carries less current and core of the conductor carries more current

D

Any of the above

The skin effect of a conductor will reduce as the

A

Resistivity of conductor material increases

B

Permeability of conductor material increases

C

Diameter increases

D

Frequency increases

Skin effect is proportional to

A

$${\left( {{\text{conductor diameter}}} \right)^{\frac{1}{2}}}$$

B

(conductor diameter)⁴

C

(conductor diameter)²

D

(conductor diameter)³

E

none of the above

Skin effect occurs when a conductor carries current at _________ frequencies.

A

Very low

B

Low

C

Medium

D

High

লাইনে ফ্রিকুয়েন্সি বাড়লে 'Skin effect' কি হয়?

A

বৃদ্ধি পায়

B

হ্রাস পায়

C

অপরিবর্তিত থাকে

D

কোনোটিই নয়

On which of the following factors the number of phases for which a rectifier should be designed depends?

A

The voltage regulation of the rectifier should be low

B

In the output circuit there should be no harmonics

C

The power factor of the system should be high

D

All of the above

The value of exciting or magnetizing current depends upon which of the following factors ?

A

Total m.m.f. required

B

The number of turns in the exciting winding

C

The way in which the winding is distributed

D

All of the above

On which of the following factors skin effect depends?

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