Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. Water is normally used as a coolant in the heat exchange equipments mainly because of its
a. Abundance & high heat capacity
b. Low density
c. Low viscosity
d. High fluidity
Q. At constant temperature, the thermal conductivities of gases __________ with rise inpressure.
a. Decrease
b. Increase
c. Remain unchanged
d. May increase or decrease; depends on the pressure
Q. When warm and cold liquids are mixed, the heat transfer is mainly by
a. Conduction
b. Convection
c. Radiation
d. Both (A) & (C)
Q. 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
Q. Open pan evaporators are preferred to be used, when the solution to be concentrated is
a. Scaling
b. Highly viscous
c. Corrosive
d. Salty
Q. A __________ evaporator employs an annular downtake.
a. Basket type
b. Horizontal
c. Long tube vertical
d. None of these
Q. The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heatexchanger is
a. Lower tube side pressure drop
b. Lower shell side pressure drop
c. Higher tube side heat transfer co-efficient
d. Higher shell side heat transfer co-efficient
Q. With increase in temperature, the thermal conductivity of fresh lubricating oil
a. Increases
b. Decreases
c. Remains unchanged
d. May increase or decrease; depends on its composition
Q. Vent pipes are provided in a condenser to
a. Remove non-condensable gases
b. Purge the condenser
c. Facilitate easy cleaning of tubes
d. None of these
Q. To reduce the tube side pressure drop for the same flow rate, the heat exchangerrecommended is
a. 1-2 heat exchanger
b. 1-1 heat exchanger
c. 3-2 heat exchanger
d. 2-4 heat exchanger
Q. LMTD for counter-flow and parallel flow heat exchanger will be the same, when the
a. Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
b. Outlet temperature of both the hot and cold fluid are same
c. Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
d. None of these
Q. In case of __________ boiling, the liquid temperature is below the saturation temperatureand the boiling takes place in the vicinity of the heated surface.
a. Nucleate
b. Local
c. Pool
d. Saturated
Q. Steam trap is used to
a. Condense the steam flowing in the pipeline
b. Remove water resulting from partial condensation of steam
c. Stop the supply of steam
d. None of these