Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.

Spark plugs are made of

A

High alumina ceramic

B

Metallic carbides

C

Corundum

D

Carborundum

In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

A

Low density

B

Low temperature

C

Long ignition delay

D

All of these

The advancing of spark timing in spark ignition engines will _________ knocking tendency.

A

Increase

B

Reduce

C

Not effect

D

None of these

The most accurate ignition system of a spark ignition engine is

A

Magneto system

B

Battery system

C

Electronic control unit system

D

Magneto and electronic system

The ignition in a spark ignition engine takes place when the piston is

A

Exactly at the T.D.C. position on its compression stroke

B

Approaching the T.D.C. position on its compression stroke

C

Leaving the T.D.position on its compression stroke

D

Approaching the T.D.C. position on its exhaust stroke

The auto ignition in a spark ignition engine means

A

Automatic ignition of the charge at the end of compression

B

Ignition induced by the passage of a spark

C

Ignition of the charge before the passage of flame front

D

Ignition induced to supplement the process of normal combustion

Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel

A

24 %

B

36 %

C

40 %

D

60 %

Locomotive boiler tubes are made of __________ alloys.

A

Arsenic copper

B

Magnesium

C

Aluminium

D

Nickel

Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

A

12

B

36

C

54

D

68

Nickel base alloys with __________ are known as monel metal.

A

Zinc

B

Tin

C

Copper

D

Molybdenum

Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.

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