Which of the following alloy steels is the most suitable for making gun barrels and projectiles?

For hardening alloy steels and high speed steels, they are heated to

A

1100 to 1300°C

B

1300 to 1500°C

C

500 to 600°C

D

700 to 900°C

Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

A

Silicon steel

B

Chromium steel

C

Molybdenum steel

D

None of these

Which of the following statement is correct in connection with projectiles?

A

A path, traced by a projectile in the space, is known as trajectory.

B

The velocity, with which a projectile is projected, is known as the velocity of projection.

C

The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

D

All of the above

'Killed steels' are those steels

A

Which are destroyed by burning

B

Which after their destruction are recycled to produce fresh steel

C

Which are deoxidized in the ladle with silicon and aluminium

D

In which carbon is completely burnt

Steels with high carbon equivalent have poor weldability, because in these steels during welding

A

Carbon and other alloying elements get oxidised from the weld pool

B

Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld

C

Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

D

Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Ferric stainless steels compared to austenitic stainless steels

A

Have lower corrosion resistance

B

Are harder to fabricate

C

Are less ductile and hence less suitable for cold pressing

D

All of the above

Gun metal is an alloy of

A

Nickel, tin and copper

B

Copper, tin and zinc

C

Copper, phosphorus and nickel

D

Manganese, phosphorus and nickel

The velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to

A

1 to 2 m per second

B

2 to 3 m per second

C

3 to 4 m per second

D

4 to 5 m per second

Which of the following material is not used in alloy steels?

A

Molybdenum

B

Nickel

C

Chromium

D

Sodium

The alloy, mainly used for corrosion resistance in stainless steels is

A

Silicon

B

Manganese

C

Carbon

D

Chromium

Which of the following alloy steels is the most suitable for making gun barrels and projectiles?

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