Question 1

The application of monolithic refractories by means of air placement guns is

Options :

A : gunning

B : placing

C : pouring

D : casting

Answer: A

Question 2

Which of the following conditions must be met for test results from trial mixes of low cement castables to be accepted for qualification?

Options :

A : The water content must not vary more than ±1.0% from that recommended by the manufacturer.

B : Specimens must be fired at 1500°F (815°C) and held for a minimum of 3 hours.

C : Bulk density and CCS must exceed average values published in ASTM C401.

D : The drying process must be conducted at 220°F (104°C) for at least 48 hours before firing.

Answer: A

Question 3

Section of transfer line in which flow is in an upward direction is called

Options :

A : cyclone of FCCU

B : Plenum of FCCU

C : Riser of FCCU

D : None of the above

Answer: C

Question 4

Which of the following is a correct condition for gunned material test panels used for CCS and PLC testing?

Options :

A : Test panels must be 24 in. Ã— 24 in. Ã— 6 in. thick and shot vertically.

B : The minimum gunned thickness shall be 2 in., with a tolerance of ±0.25 in.

C : A vibrating screed must be used during panel finishing.

D : Test panels must be dried at 400°F (204°C) for 6 hours before specimen extraction.

Answer: B

Question 5

As per ASTM C- 704, for the erosion tests, silicon carbide grit to be used by

Options :

A : one time

B : two time

C : three time

D : none of the above

Answer: A