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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 14
Q1 | Room air conditioners and packaged units are examples of _________
- direct expansion systems
- indirect expansion systems
- chilled water systems
- indirect contraction systems
Q2 | The process of extraction of the certain required amount of water from air is known as ___________
- heating
- cooling
- humidification
- dehumidification
Q3 | The reciprocal of thermal conductivity is known as __________
- thermal conductance
- surface resistance
- specific conductance
- thermal resistivity
Q4 | Condensers and evaporators together form a ____________
- heat exchanger
- refrigeration system
- thermocouple
- heating system
Q5 | In traditional Refrigerators in home appliances, what is the type of condenser used?
- natural convection type
- forced convection type
- furnace type
- rotary condensers
Q6 | In traditional Air conditioners in home appliances, what is the type of condenser used?
- natural convection type
- forced convection type
- flash type
- rotary condensers
Q7 | In evaporative condensers, ___________ used to extract heat from the condensing refrigerant.
- air is
- both air and water are
- water is
- either air or water is
Q8 | Evaporative condensers combine the features of a _____________ in a single unit.
- cooling tower and water-cooled condenser
- falling tower and water-cooled condenser
- cooling tower and air condenser
- rising film tower and water-cooled condenser
Q9 | Evaporative condensers are used in places where water is _________
- scarce
- plenty
- moderately available
- sufficient
Q10 | What is the meaning of heat rejection ratio (HRR) of a condenser?
- ratio of heat rejected to the heat absorbed
- ratio of heat absorbed to the heat rejected
- ratio of heat required to the heat lost
- ratio of heat wasted in a cycle to the heat absorbed
Q11 | What is the relation between heat rejection ratio (HRR) and Coefficient of performance (COP)?
- hrr = 1 + 1/cop
- hrr = 1+ cop
- hrr = cop/2
- hrr = 1/cop
Q12 | Which type of fins are the most commonly used fin type in condensers?
- annular fin
- plate type fins
- tube fin
- extended double pipe
Q13 | Shell and coil type condensers have a capacity at around ________
- 10 tr
- 20 tr
- 30 tr
- 50 tr
Q14 | Double pipe water cooling condensers have a capacity at around ________
- 10 tr
- 20 tr
- 30 tr
- 50 tr
Q15 | If there is a decrease in viscosity, the heat transfer coefficient ____________
- increase
- decrease
- remains same
- becomes zero
Q16 | An increase in diameter means a _________ heat transfer coefficient.
- larger
- smaller
- zero
- infinite
Q17 | why is an analyser-rectifier combination is used in absorption refrigeration cycle?
- to increase the amount of water vapour in ammonia vapour
- to decrease the amount of water vapour in ammonia vapour
- to eliminate the water vapour from ammonia vapour
- all of the mentioned
Q18 | The vapour going to condenser is ____ in temperature and ____ in ammonia.
- higher, less
- higher, richer
- lower, less
- lower, richer
Q19 | Water is used as a ____ in air conditioning units.
- absorbent
- refrigerant
- absorbent and refrigerant
- none of the mentioned
Q20 | The COP of absorption refrigeration system is
- low
- high
- equal to that of vapour compression refrigeration system
- none of the mentioned
Q21 | The wet bulb temperature is the ____ temperature recorded by moistened bulb.
- lowest
- highest
- atmospheric
- none of the mentioned
Q22 | When unsaturated air flows over a sheet of water in an insulated chamber
- specific humidity of air decreases
- the water evaporates
- both air and water are cooled during evaporation
- all of the mentioned
Q23 | When humidity ratio of air ____ air is said to be dehumidified.
- increases
- decreases
- remains constant
- none of the mentioned
Q24 | Cooling towers are rated in terms of
- approach
- range
- both of the mentioned
- none of the
Q25 | Nozzle is used to control direction or characteristics of flow.
- true
- false