QUESTION 20
For fire clay and some high alumina materials, the most commonly used index of refractoriness is known as:

QUESTION 21
Heating the new refractory too rapidly will cause

QUESTION 22
Equipment used during applicator qualification testing shall be:

QUESTION 23
A refractory materials, stiffer than plastic, that cannot be extruded but has suitable properties to permit ramming into place to form a monolithic structure

QUESTION 24
The lining surface should remain uncovered and free from contact with moisture during the curing period for what type of refractory?

QUESTION 25
Which of the following is a longitudinally hinged anchoring system for curved applications?

QUESTION 26
The term that describes the condition of pre-set refractory in which gravitational forces cause it to lose its desired shaped is called

QUESTION 27
Which of the following does not apply to cold crushing strength (CCS)?

QUESTION 28
Apparent porosity values are reported as:

QUESTION 29
Refractories chemically and physically stable at

QUESTION 30
Blanket, Module, Bulk paper, rope, and vacuum formed shaped are:

QUESTION 31
The surface of a refractory section exposed to the source of heat

QUESTION 32
Test results received from cast sample mock-ups will serve to qualify the:

QUESTION 33
For erosion service, density results are determined from which of the following specimens?

QUESTION 34
Surface preparation and welding procedures are the responsibility of the:

QUESTION 35
What abrading media is required in the ASTM C-704 abrasion-resistant test?

QUESTION 36
Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:

QUESTION 37
A change in the length of a specimen measured before and after heating to a specific temperature is referred to as:

QUESTION 38
The mock-up for vibration cast installations demonstrates the adequacy of the: (This may have more than one correct answer; please select all that apply.)

QUESTION 39
The best definition for creep is:

QUESTION 40
Refractory cast into a mock-up may be stripped and visually inspected after a minimum curing of

QUESTION 41
Gunning test panels are constructed with removable back panels:

QUESTION 42
If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining shall be: