Question 1

For non-erosive service, what is the required number of test specimens per sample for cold crushing strength?

Options :

A : 1

B : 2

C : 3

D : 4

Answer: B

Question 2

For air-setting phosphate bonded, erosion – resistant refractories mixing , the mixer’s paddles and bowls shall be

Options :

A : Aluminium

B : Steel

C : Carbon

D : None of the above

Answer: B

Question 3

Blanket, Module, Bulk paper, rope and vacuum formed shaped are:

Options :

A : shaped refractory

B : unshaped refractory

C : refractory fibre

D : all of the above.

Answer: C

Question 4

Refractories chemically and physically stable at

Options :

A : Low temperatures

B : Average temperatures

C : High temperatures

D : None of the above.

Answer: C

Question 5

Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:

Options :

A : air cured, covered.

B : heat cured, uncovered.

C : air cured, uncovered.

D : heat cured, covered.

Answer: C

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