Radiator of an automobile engine is a __________ type of heat exchanger. Counter-current Direct contact Co-current Cross-current TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is unimportant in forced convection ? Prandtl number Grashhoff number none of the listed here Reynolds number TRUE ANSWER : ? YOUR ANSWER : ?
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body) αT α 1/T α T⁴ Independent of T TRUE ANSWER : ? YOUR ANSWER : ?
In counter flow compared to parallel flow, More surface area is required for a given heat transfer rate Less surface area is required for a given heat transfer rate Both A and B LMTD is greater TRUE ANSWER : ? YOUR ANSWER : ?
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a heat exchanger boiler regenerator recuperator TRUE ANSWER : ? YOUR ANSWER : ?
The number of kg vaporised per kg of steam fed to the evaporator is defined as Economy Capacity Rate of evaporation Rate of vaporisation TRUE ANSWER : ? YOUR ANSWER : ?
In a forward feed multiple effect evaporator, the pressure is Lowest in last effect Dependent on the number of effects Same in all effects Highest in last effect TRUE ANSWER : ? YOUR ANSWER : ?
Nusselt number is the ratio of the temperature gradient at the wall to None of these That across the entire pipe Heat flux Temperature difference TRUE ANSWER : ? YOUR ANSWER : ?
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about 50 -100 W/m² . °K 50 -100 BTU/hr. ft.2°F 1000 - 1500 BTU/hr. ft.2°F 50 -100 Kcal/hr.m².°C TRUE ANSWER : ? YOUR ANSWER : ?
(Cp . μ)/K is termed as the __________ number. Grashoff Stanton Nusselt Prandtl TRUE ANSWER : ? YOUR ANSWER : ?