Pick out the wrong unit conversion of thermal conductivity ?

Related Mcqs:

1. Pick out the wrong unit conversion of heat transfer rate?

   A. 1 kcal/hr= 1.163 Watt
   B. 1 Watt = 1.163 kcal/hr
   C. 1 BTU/ft2.hr = 2.712 kcal/m2.hr
   D. 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2

2. Pick out the wrong unit conversion of temperature?

   A. °R = 273 + °F
   B. Temperature difference of 1°K = 1°C = 9/5°F
   C. °C = (F- 32) × 0.555
   D. °F = (°C + 17.778) × 1.8

3. 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

4. Pick out the wrong unit conversion of calorific value?

   A. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
   B. 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3
   C. 1 BTU/lb = 2.3 kcal/kg
   D. 1 kcal/m3 = 0.1124 BTU/ft3

5. Pick out the wrong unit conversion of mass transfer co-efficient?

   A. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar
   B. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar
   C. 1 lb/hr.ft2 = 4.8823 kg/hr.m2
   D. 1 kg/hr.m2 = 4.8823 lb/hr.ft2

6. Thermal conductivity of refractory bricks____________________?

   A. Increases with decrease in porosity
   B. Decreases with decreases in porosity
   C. Is independent of its porosity and is maximum for insulating bricks
   D. Increases with the amount of air entrapped in pores

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

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

8. An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?

   A. Cork
   B. Saw dust
   C. Sand
   D. Chemically prepared foam

9. According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?

   A. T
   B. T0.5
   C. T1.5
   D. T2

10. Pick out the correct conversion?

    A. 1 BTU =453.6 calories
    B. 1 BTU = 252 calories
    C. 1 calorie = 252 BTU
    D. 1 calorie = 453.6 BTU