Question 1

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 2

Spalling of layers from the hot surface of a refractory lining is called

Options :

A : spalling

B : sheeting

C : crumbling

D : erosion

Answer: B

Question 3

Cristobalite is an important constituent of

Options :

A : Alumina bricks

B : Silica brick

C : Magnesia brick

D : Insulating brick

Answer: B

Question 4

For the qualification of the applicator/installer, they shall demonstrate their ability to install the refractory:

Options :

A : to meet the specified quality standards utilized for the installation of work.

B : by using the technique prescribed by the manufacturer no matter which material is used.

C : free of visible voids, laminations on the hot face or working surface only for gunned lining.

D : free of visible voids, laminations on the hot face or working surface only of the refractory lining.

Answer: A

Question 5

A moldable refractory material that can be extruded and has a level of workability that permits it to be pounded into place to form a monolithic structure

Options :

A : Ramming mix

B : Plastic refractory

C : Monolithic refractory

D : None of the above

Answer: B