In the green sand moulding of steel casting, what is the dextrine percentage composition?

In dry sand moulding of steel casting, what is the dextrine percentage composition?

A

0.5%

B

1.5%

C

2.5%

D

3.5%

Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.

A

True

B

False

In the green sand moulding of steel casting, what is the bentonite percentage composition?

A

1.5%

B

2.5%

C

3.5%

D

4.5%

In the green sand moulding of steel casting, what is the moisture percentage composition?

A

1% – 2%

B

2% – 3%

C

3% -4%

D

4% – 5%

In green sand moulding of steel casting, what is the moisture percentage composition?

A

2-3%

B

3-4%

C

4-5%

D

5-6%

In dry sand moulding of steel casting, what is the bentonite percentage composition?

A

1%

B

2%

C

4%

D

5%

The casting processes that require expendable moulds are
P. Investment casting
Q. Low pressure casting
R. Shell moulding
S. Slush casting

A

P, Q

B

Q, R

C

R, S

D

P, R

Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:

A

Both A and R is true and R is the correct explanation of A

B

Both A and R is true but R is not the correct explanation of A

C

A is true but R is false

D

A is false but R is true

What are the temperature and pressure conditions in compression moulding technique in the moulding of phenolic moulding powder?

A

160-170 ᵒC and 1500-3000 psi

B

100-120 ᵒC and 1000-1500 psi

C

160-170 ᵒC and 500-1000 psi

D

100-200 ᵒC and 1500-3000 psi

In sand moulding, the thickness of sand mould and bond strength should be high as much as possible to avoid sand inclusion in machine parts.

A

True

B

False

In the green sand moulding of steel casting, what is the dextrine percentage composition?

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