Refractories used in/for ______________ should have low thermal conductivity?

A. Coke ovens
B. Insulation
C. Regenerators
D. Muffle furnaces

N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60) ?

A. 80%
B. 90%
C. 95%
D. 98%

Enthalpy of a vapor gas mixture may be increased by increasing the________________?

A. Temperature at constant humidity
B. Humidity at constant temperature
C. Temperature and the humidity
D. All A., B. & C.

On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________?

A. 1
B. 8
C. 4
D. 2

A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?

A. 350
B. 485
C. 140
D. 345

Which equation is not an equation of state ?

A. PV = RT + B/V + y/V2 + ….
B. (P + a/V2)(V-b) = RT
C. loge (p/p0) = (λ/R) (1/T0 – 1/T)
D. p = [RT/(V – b)] – (a/TV2)

Which of the following ideal gas laws are not applicable to mixture of gases ?

A. Amagat’s law
B. Dalton’s law
C. Boyle’s law & Charle’s Law
D. None of these

Outer combustion chamber of blast furnace stove is lined with _______________ bricks?

A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia

A saturated vapor on being compressed would___________________?

A. Condense
B. Form wet steam
C. Both A. & B.
D. Neither A. nor B.

Pick out the wrong unit conversion of heat transfer co-efficient?

A. 1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m2.°K
B. 1 kcal/m2.hr.°K = 1.163 W/m2.°C
C. 1 W/m2.°C = 0.1761 BTU/ft2.hr.°F.
D. 1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C