Top 550+ Solved Thermal Engineering 2 MCQ Questions Answer
Q. What is the relation between heat rejection ratio (HRR) and Coefficient of performance (COP)?
a. hrr = 1 + 1/cop
b. hrr = 1+ cop
c. hrr = cop/2
d. hrr = 1/cop
Q. Which type of fins are the most commonly used fin type in condensers?
a. annular fin
b. plate type fins
c. tube fin
d. extended double pipe
Q. Shell and coil type condensers have a capacity at around ________
a. 10 tr
b. 20 tr
c. 30 tr
d. 50 tr
Q. Double pipe water cooling condensers have a capacity at around ________
a. 10 tr
b. 20 tr
c. 30 tr
d. 50 tr
Q. If there is a decrease in viscosity, the heat transfer coefficient ____________
a. increase
b. decrease
c. remains same
d. becomes zero
Q. An increase in diameter means a _________ heat transfer coefficient.
a. larger
b. smaller
c. zero
d. infinite
Q. why is an analyser-rectifier combination is used in absorption refrigeration cycle?
a. to increase the amount of water vapour in ammonia vapour
b. to decrease the amount of water vapour in ammonia vapour
c. to eliminate the water vapour from ammonia vapour
d. all of the mentioned
Q. The vapour going to condenser is ____ in temperature and ____ in ammonia.
a. higher, less
b. higher, richer
c. lower, less
d. lower, richer
Q. Water is used as a ____ in air conditioning units.
a. absorbent
b. refrigerant
c. absorbent and refrigerant
d. none of the mentioned
Q. The COP of absorption refrigeration system is
a. low
b. high
c. equal to that of vapour compression refrigeration system
d. none of the mentioned
Q. The wet bulb temperature is the ____ temperature recorded by moistened bulb.
a. lowest
b. highest
c. atmospheric
d. none of the mentioned
Q. When unsaturated air flows over a sheet of water in an insulated chamber
a. specific humidity of air decreases
b. the water evaporates
c. both air and water are cooled during evaporation
d. all of the mentioned
Q. When humidity ratio of air ____ air is said to be dehumidified.
a. increases
b. decreases
c. remains constant
d. none of the mentioned
Q. Cooling towers are rated in terms of
a. approach
b. range
c. both of the mentioned
d. none of the