Silicon percentage in iron castings to have maximum hardness should be about

Silicon percentage in silicon steel used for electrical equipments is about

A

1

B

4.0

C

8

D

14

Silicon percentage in the silicon steel used for electrical appliances/equipments is

A

0.3-0.4

B

12-14

C

3-4

D

20-25

The percentage of carbon in grey iron castings usually varies between

A

0.5 to 1%

B

1.2%

C

2.5 to 4.5%

D

5 to 7%

If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be

A

10 mm/m

B

16 mm/m

C

20 mm/m

D

26 mm/m

Silicon percentage in acid resistant cast iron is about

A

4

B

8

C

14

D

20

An SCR is made of silicon and not germanium because silicon

A

Is inexpensive

B

Is mechanically strong

C

Has small leakage current

D

Is tetravalent

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

A

Total alkalinity

B

Total hardness

C

Total hardness total alkalinity

D

Non carbonate hardness

Grain hardness is measured by the __________ hardness testing method.

A

Knoop

B

Rockwell F

C

Shore sceleroscope

D

Vicker's

Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

A

Vicker's hardness test

B

Shore sceleroscope test

C

Brinell hardness test

D

Rockwell hardness test

Which of the following hardness tests uses the depth of penetration caused by the indentor as the parameter for arriving at the hardness value of a material ?

A

Shore sceleroscope test

B

Vicker's hardness test

C

Brinell hardness test

D

Rockwell hardness test

Silicon percentage in iron castings to have maximum hardness should be about

Related Questions