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70.

71.

72.

73.

74.

75.

The relative permeability of a magnetic material depends on the
1. flux

2. type of material

3. type of magnetizing force

4. retentivity.

A) 2 only B) 1 and 2 only

©) 4 and 1 only D) 3 only

A material slightly repelled by a magnet are called

A) ferromagnetic material B) insulating material
C) paramagnetic material D) diamagnetic material

The process of magnetizing steel is difficult because
A) it corrodes easily B) it has low permeability
C) it has low specific gravity D) it has high conductivity

The transformer oil used in a transformer provides

1. cooling and insulation

2. insulation and conduction

3. cooling and lubrication

4. insulation and cooling

A) both 1 and3 8) both 1 and 4
©) both 3 and 2 0) both 1 and 2

Which of the following is incorrect ?

1. Meggar - for checking insulation resistance

2. Lux meter - measure the amount of amplitude in a work space
3. Clamp meter - resistance

4. Tachometer - revolution per minute

A) both 1 and 2 B) both 4 and 1

C) both 3 and 4 0) both 28೧63

Lead sheath wiring should not be installed near alkaline natured places
A) statement is correct

B) statement is incorrect

C) statement is correct or not correct

D) none of these

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