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MCQs 1: What should be the initial temperature of gas to obtain maximum cooling effect in the Joule-Kelvin expansion?

the initial temperature of gas should be less than the temperature corresponding to inversion point of isenthalpic curve of the expansion of gas the initial temperature of gas should be more than the temperature corresponding to inversion point of isenthalpic curve of the expansion of gas the initial temperature of gas should be equal the temperature corresponding to inversion point of isenthalpic curve of the expansion of gas none of the above
Answer Explanation

MCQs 2: At the maximum inversion temperature in the graph of isenthalpic or joule-kelvin expansion of a gas, the value of Joule-Kelvin coefficient is

negative positive zero positive, negative or zero depends upon initial temperature
Answer Explanation

MCQs 3: What is the effect of reheat on the net work output of the steam power plant?

the net work output of the steam power plant decreases with reheat because of the increase in heat addition the net work output of the steam power plant increases the net work output of the steam power plant does not affected by the reheat cannot say
Answer Explanation

MCQs 4: The reheat cycle allows steam power plant

to use higher pressure ratio to maintain required quality of steam at the exit of the turbine to increase the turbine work all of the above
Answer Explanation

MCQs 5: In ideal regenerative cycle (saturated steam Rankine cycle), the heat addition takes place

from lowest temperature to highest temperature at constant pressure at constant temperature none of the above
Answer Explanation

MCQs 6: What is the relation between efficiencies of the ideal regenerative Rankine cycle and the Carnot cycle?

the efficiency of ideal regenerative Rankine cycle is less than the efficiency of Carnot cycle the efficiency of ideal regenerative Rankine cycle is more than the efficiency of Carnot cycle the efficiency of ideal regenerative Rankine cycle is equal to the efficiency of Carnot cycle none of the above
Answer Explanation

MCQs 7: Which cycle is more suitable for the reciprocating engines?

Brayton cycle Rankine cycle Otto cycle All of the above are similarly efficient for same capacity
Answer Explanation

MCQs 8: Which cycle is more efficient for electricity generation plant?

Brayton cycle Rankine cycle Otto cycle none of the above
Answer Explanation

MCQs 9: Which among the following is the basic air standard cycle for all modern gas turbine plants?

Brayton cycle Rankine cycle Otto cycle Diesel cycle
Answer Explanation

MCQs 10: What is the effectiveness of the regenerator in gas power plant?

ratio of actual rise in temperature of air to the maximum possible rise in temperature of air ratio of the maximum possible rise in temperature of air to actual rise in temperature of air difference between maximum possible rise in temperature of air and actual rise in temperature of air none of the above
Answer Explanation

MCQs 11: What is the effect of regeneration on mean temperature of heat addition in Brayton cycle?

mean temperature of heat addition decreases because of regeneration mean temperature of heat addition increases because of regeneration mean temperature of heat addition is not affected by use of regenerator none of the above
Answer Explanation

MCQs 12: What is the effect of regeneration on net work output in Brayton cycle?

net work output decreases because of regeneration net work output increases because of regeneration net work output is not affected by use of regenerator none of the above
Answer Explanation

MCQs 13: If pressure ratio in Brayton cycle increases

the efficiency of the cycle increases the efficiency of the cycle decreases there is no any effect on the efficiency of the cycle cannot say
Answer Explanation

MCQs 14: What is the disadvantage of ammonia using as a refrigerant?

ammonia cannot be detected in case of leakage ammonia has a bad effect on ozone layer ammonia is toxic in nature ammonia has higher energy cost
Answer Explanation

MCQs 15: The mechanical work required to run vapour absorption system

is more than the mechanical work required to run vapour compression system is less than the mechanical work required to run vapour compression system is similar to the mechanical work required to run vapour compression system cannot say
Answer Explanation

MCQs 16: The compressor in the vapour compression system is replaced by

an absorber a generator an absorber-generator none of the above
Answer Explanation

MCQs 17: What is the condition of refrigerant at the exit of evaporator in aqua-ammonia absorption system?

low pressure ammonia vapour high pressure ammonia vapour low pressure strong vapour mixture of ammonia and water high pressure strong vapour mixture of ammonia and water
Answer Explanation

MCQs 18: What is the process carried out in generator of vapour absorption refrigeration cycle?

weak solution of ammonia in water is heated strong solution of ammonia in water is heated only water is heated and heat is given to the ammonia to form its vapour none of the above
Answer Explanation

MCQs 19: In absorber of aqua-ammonia absorption refrigeration system

strong solution is taken in and weak solution is given out weak solution is taken in and strong solution is given out the ammonia vapour from strong solution is taken out and made it a weak solution none of the above
Answer Explanation

MCQs 20: The temperature, at which the air cannot hold all the water vapour mixed in it and some vapour starts condensing, is called as

humidification temperature dehumidification temperature dew point temperature none of the above
Answer Explanation

MCQs 21: The formation of fog starts when,

air temperature is equal to the dew point temperature air temperature is greater than the dew point temperature both a. and b. none of the above
Answer Explanation

MCQs 22: When the dew point temperature is equal to the air temperature then the relative humidity is

0% 50% 100% unpredictable
Answer Explanation

MCQs 23: The purpose of superheater in a boiler is

to increase the temperature of saturated steam with increase in its pressure to increase the temperature of saturated steam without increase in its pressure to increase the temperature of feedwater for better efficiency none of the above
Answer Explanation

MCQs 24: A system will be in a state of thermodynamic equilibrium, if it undergoes.

mechanical equilibrium chemical equilibrium thermal equilibrium all of the above
Answer Explanation

MCQs 25: In electric resistance thermometer, the thermometric property is

electric current passing through a metal wire resistance of a metal wire voltage between two extreme end points of a metal wire none of the above
Answer Explanation

MCQs 26: In free expansion of gas, the work transfer is

negative zero positive none of the above
Answer Explanation

MCQs 27: A machine which can supply mechanical work continuously without consumption of any energy is called as

Perpetual Motion Machine of the First kind (PMM1) Perpetual Motion Machine of the Second kind (PMM2) Perpetual Motion Machine of the Third kind (PMM3) none of the above
Answer Explanation

MCQs 28: The Kelvin temperature scale is independent of the certain characteristics of any substance.

True False
Answer Explanation

MCQs 29: Which point is taken as the standard reference point to define the Kelvin temperature scale?

Boiling point of water Triple point of water Freezing point of water Boiling point of Mercury
Answer Explanation

MCQs 30: Arbitrarily, the value of triple point is taken as

0 K 273.16 °C 273.16 K none of the above
Answer Explanation

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