1 BTU/hr.ft.°F is equal to _____________ kcal/hr. m.°C?

Related Mcqs:

1. Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

   A. 0.35
   B. 0.45
   C. 0.55
   D. 0.85

2. A BTU/hr.ft.2 °F is equal to_________________?

   A. 1 kcal/hr. m2°C
   B. 4.88 kcal/hr. m.2°C
   C. 1 kcal/hr. m2.°K
   D. None of these

3. Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around ______________ BTU?

   A. 180
   B. 970
   C. 3.97
   D. Data insufficient, can’t be predicted

4. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?

   A. 180
   B. 970
   C. 3.97
   D. None of these

5. Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?

   A. 40
   B. 95
   C. 70
   D. 50

6. Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?

   A. Higher condensing film co-efficient is desired
   B. Condensate is corrosive in nature
   C. Lower pressure drop through the exchanger is desired
   D. Temperature of the incoming vapor is very high

7. Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?

   A. 10-50
   B. 100-500
   C. 1000-1500
   D. 5000-15000

8. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?

   A. Twice
   B. Four times
   C. Square root of
   D. Square of

9. According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor) ?

   A. 2f
   B. f
   C. f/2
   D. f/4

10. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the________________?

    A. Surrounding temperature
    B. Average temperature of the fin
    C. Temperature of the fin end
    D. Constant temperature equal to that of the base