Search
.Management Sciences
Category: Chemical Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?
0
A. Keeping the heat transfer surface clean
B. Enhancing the fluid pumping rate
C. Increasing the tube length
D. None of these
Nusselt number is the ratio of the temperature gradient at the wall to_________________?
A. Temperature difference
B. Heat flux
C. That across the entire pipe
D. None of these
In forced circulation, the heating element is injected_________________?
A. Internally
B. Externally
C. Both A. and A.
D. Neither A. nor B.
Maximum heat transfer rate is achieved in _____________ flow?
A. Co-current
B. Counter-current
C. Turbulent
D. Laminar
Air is best heated with steam in a heat exchanger of__________________?
A. Plate type
B. Double pipe type with fin on steam side
C. Double pipe type with fin on air side
D. Shell and tube type
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?
A. In low range of temperature differences
B. In high range of temperature differences
C. Because of its low cost
D. To prevent corrosion of the tube bundles
Radiation energy is emitted by all the substances, which are above____________________?
A. 0°K
B. 0°C
C. 100°C
D. Room temperature
Fruit juice (a heat sensitive material) can be concentrated in a ____________ evaporator?
A. Long tube
B. Falling film
C. High pressure
D. None of these
Recent Comments