ESE ME 2018: Thermodynamics Achievers National Test for ESE & GATE ME Exams

Question 1

Match List-| with List-|| and select the correct answer using the code given below the lists:
List-|
A) Critical point
B) Sublimation
C) Triple point
D) Melting
List-||
1) All the three phase solid, liquid and vapour co-exists in equilibrium.
2) Phase change from solid to liquid
3) properties of saturated liquid and saturated vapour are identical
4) Heating process where solid gets directly transformed to gaseous phase.

Question 2

The following readings refer to a vapour compression refrigerator:
The enthalpy per kg of refrigerant flow, from p-h chart
at inlet to compressor – 1500 kJ/kg
at outlet to compressor – 1700 kJ/kg
at exit of condenser – 300 kJ/kg
The COP of the refrigerator is

Question 3

Across the normal shock, fluid properties change in such a manner that the
(1). Velocity of flow is subsonic
(2). Pressure increases
(3). Specific volume decreases
(4). Temperature decreases
Which of the above are correct?

Question 4

What will be the work done in by sample of gas in isobaric, isothermal and adiabatic process, if the volume of gas is reduced from V₁to V₂.

Question 5

In which one of the following processes, in a closed system the thermal energy transferred to a gas is completely converted to internal energy resulting in an increase in gas temperature?

Question 6

Which gas shows a heating effect in the Joule- Thomson experiment, while undergoing throtting process throuf a porous plug of cotton wool?

Question 7

During single engine cycle, what will be the total change in entropy of hot and cold reservoirs?

Question 8

Two identical finite bodies of constant heat capacity at temperature

and

are avilable to do work in a heat engine. The final temperature

reached by the bodies on delivery of maximum work is

Question 9

Consider the following statements with regard to CI engines:
1). For best fuel economy of spark ignition engines, the fuel-air mixture should be lean
2). With supercharging, the specific consumption in compression ignition engines increases
3). With increase of load, knocking tendency in compression ignition decreases
Which of the above statements are correct?

Question 10

Which of the following statements is correct?

Question 11

In a vapour compression cycle, a good refrigerant should have a

Question 12

In a Brayton Thermodynamic Cycle showing T-S diagram, work done on turbine is same as work done by compressor because:

Question 13

Consider the following statements:
1) Gases have a very low critical temperature
2) Gases can be liquefied by isothermal compression
3) In engineering problems, water vapour in atmosphere is treated as an ideal or perfect gas
Which of the above statements are correct?

Question 14

When a system is taken from state ‘x’ and ‘y’ 30 kJ of heat flows into the system and the system does 10 kJ of work. When the system is returned from ‘y’ to ‘x’ along another path,work done on the system is 8 kJ. What is the amount of heat liberated or absorbed?

Question 15

Direction: Each of the question consist of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the codes given below:

Statement (I): Knocking in the Petrol engine is the auto-ignition of the rich mixture entering the combustion chamber.
Statement (II): Knocking is due to high compression ratio.