A. W/m
B. W/m2
C. W/°K
D. W/m°K
Related Mcqs:
- Conductance is given by (where, x = thickness, A = heat flow area, K = thermal conductivity.)?
A. x/KA
B. KA/x
C. K/Ax
D. A/Kx - The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?
A. ∝ t
B. ∝ 1/t
C. ∝ √t
D. Independent of ‘t’ - The unit of heat transfer co-efficient in SI unit is____________________?
A. J/M2°K
B. W/m2°K
C. W/m°K
D. J/m°K - Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
A. 0.2
B. 0.4
C. 0.6
D. 0.8 - A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 – 1 shell and tube heat exchanger is available. The best arrangement is_______________?
A. Counter flow with process stream on shell side
B. Counter flow with process stream on tube side
C. Parallel flow with process stream on shell side
D. Parallel flow with process stream on tube side - A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?
A. 2
B. 20.8
C. 20.2
D. 20.5 - What is the unit of thermal conductivity ?
A. Kcal/hr. m2 °C
B. Kcal/hr.m.°C
C. Kcal/hr.m
D. Kcal/hr. °C - Heat transfer rate per unit area is called_________________?
A. Thermal conductivity
B. Heat flux
C. Heat transfer co-efficient
D. Thermal diffusivity - The unit of heat transfer co-efficient is_________________?
A. BTU/hr. ft2°F
B. BTU/hr. °F. ft
C. BTU/hr. °F
D. BTU/hr. ft - If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?
A. Increase by 1.8 times
B. Decrease by 22
C. Increase by 216
D. Remain unchanged
