Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. "The boiling point of a solution is a linear function of water at the same pressure". The above statement is associated with
a. Dubring's rule
b. Petit and Dulong law
c. Fick's rule
d. Reynolds law
e. None of the above
Q. When a vapour condenses into a liquid
a. It absorbs heat
b. It evolves heat
c. Its temperature rises
d. Its temperature drops
e. None of the above
Q. If the absorptivity plus reflectivity of a body equals 1, then the body is known as
a. Black body
b. Grey body
c. Opaque body
d. White body
e. None of the above
Q. Prandtl number for liquid metals is generally in the range
a. 1000 to 10,000
b. 0.003 to 0.01
c. 10 to 100
d. 100 to 1000
e. 37,500 kg
Q. A sphere of radius 40 cm is lagged to a radius of 50 cm. The temperatures of outer and inner surfaces are 66?C and 235?C respectively. Thermal conductivity of logging per cm thickness is 0.7 kcal/m-hr?C. The rate of heat leakage will be
a. 500 kcal/hr
b. 1.49 kcal/hr
c. 666 kcal/hr
d. 298 kcal/hr
e. 398 kcal/hr
Q. A non-dimensional number generally associated with natural convection heat transfer is
a. Prandtl number
b. Weber number
c. Peclet number
d. Nusselt number
e. Grashof number
Q. The first stage of crystal formation is
a. Nucleation
b. Separation
c. Foaming
d. Vortexing
e. None of the above
Q. All heat transfer processes
a. Obey Newton's law
b. Involve temperature difference between the bodies
c. Obey first law of thermodynamics
d. Obey second law of thermodynamics
e. Involve transfer of energy
Q. A Foreman of an automobile workshop wants to measure the temperature inside the piston of a car, whose temperature will be of the order of 700?C (accurate upto 1?C). The best thermometer to use is
a. Constant volume hydrogen thermometer
b. Thermo electric thermometer
c. Platinum resistance thermometer
d. Optical pyrometer
e. Constant volume nitrogen thermometer
Q. When analogy is drawn between heat flow and electricity flow in circuits, the heat flow of thermal circuits is equated in the electrical circuit against
a. Charge (coulombs)
b. Resistance
c. 1 ; 81
d. Current
e. Voltage
Q. The ratio of the actual vapour pressure to the pressure of saturated vapour at the prevailing dry bulb temperature is known as
a. Humidity
b. Relative humidity
c. Specific humidity
d. Humidity ratio
e. Vapour humidity
Q. A liquid is boiling in a a air tight vessel. Using an exhaust tube, the vapour is pumped out at a faster rate. What happens to the liquid?
a. Temperature goes down, doiling continues
b. Temperature goes down, boiling stops
c. Temperature goes up, boiling continues
d. Nothing changes
e. Temperature goes up, boiling stops
Q. The surface which diffusely reflects and emits the same amount of energy which it receives by radiation is known as
a. A perfect black surface
b. A perfect grey surface
c. A perfect white surface
d. A perfect radiating surface
e. None of the above
Q. Which of the following have the same units?
a. Stefan's canstant and Boltzmann constant
b. Plank's constant and Stefan's constant
c. Planck's constant and angular momentum
d. Boltzmann constant and Planck's constant
e. 37,500 kg