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ESE ME: Thermal Science Champion Quiz 5
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Question 1
Consider the following statements pertaining to axial flow compressors.
1) Like centrifugal compressor, axial flow compressors are limited by surge at low mass flow rates
2) Axial flow compressors experience choking at low flow rates
3) The design point of axial flow compressors is close to the surge limit.
4) As mass flow diminishes the compressor blades stall causing flow separation.
Which of these statements is/are correct?
1) Like centrifugal compressor, axial flow compressors are limited by surge at low mass flow rates
2) Axial flow compressors experience choking at low flow rates
3) The design point of axial flow compressors is close to the surge limit.
4) As mass flow diminishes the compressor blades stall causing flow separation.
Which of these statements is/are correct?
Question 2
Assertion (A): Multi-staging compression is done only in reciprocating compressors.
Reason (R): Reciprocating compressor are used to compress large pressure ratio at low discharge.
Reason (R): Reciprocating compressor are used to compress large pressure ratio at low discharge.
Question 3
The thermal efficiency of an air-standard Brayton cycle in terms of pressure ratio τp and 
is given by
is given by Question 4
A vapour compression refrigerator has a COP of 4 and extracts 10 kJ of heat from the cold reservoir. If this machine is worked as a heat pump, how much heat will it deliver to the environment?
Question 5
In an ideal Vapour Compression Refrigeration cycle the enthalpy values at salient points are as follows.
At inlet to compressor : 1500 kJ/kg
At outlet to compressor : 1800 kJ/kg
At inlet to evaporator : 300 kJ/kg
What is the COP of the cycle?
At inlet to compressor : 1500 kJ/kg
At outlet to compressor : 1800 kJ/kg
At inlet to evaporator : 300 kJ/kg
What is the COP of the cycle?
Question 6
Assertion (A): The performance parameter ‘Polytropic efficiency’ is used for axial flow gas turbines and air compressors
Reason (R): Polytropic efficiency is dependent on the pressure ratio.
Reason (R): Polytropic efficiency is dependent on the pressure ratio.
Question 7
Water 
is fed to a boiler at 30oC, the enthalpy of vaporization at atmospheric pressure in the boiler is 2400 kJ/kg, the steam coming from the boiler is 0.9 dry. The net heat supplied in boilers?
is fed to a boiler at 30oC, the enthalpy of vaporization at atmospheric pressure in the boiler is 2400 kJ/kg, the steam coming from the boiler is 0.9 dry. The net heat supplied in boilers? Question 8
A gas turbine plant working on Joule cycle produces 4000 kW of power. If its work ratio is 40%. The consumed by the compressor is
Question 9
An open cycle pressure gas turbine uses a fuel of calorific value 40,000 kJ/kg with air-fuel ratio of 80:1 and develops a net output of 80 kJ/kg of air. The thermal efficiency of the cycle is
Question 10
During a thermodynamic process, 100 kJ of heat is transferred from a reservoir at 800 K to a sink at 400 K. The ambient temperature is 300K, the loss of availability energy is
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Jun 4ESE & GATE ME
