Combined Engineering Services Mechanical Engineering Exam paper

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1. Ice kept in a will insulated them flask
is an example of which system ?
(a) Closed system
(b) Isolated system
(c) Open system
(d) Non-flow adiabatic system

dQ 2. The relation ds = -
T , where s represents
entropy, Q represents heat and T represents
temperature (absolute), holds good in
which one of the following processes ?
(a) Reversible processes only
(b) Irreversible processes only
(c) Both reversible and irreversible
processes
(d) All real processes

4. In a reversible isothermal expansion
process, the fluid expands from 10 bar
and 2 m3 to 2 bar and 10 m3, during the
process the heat supplied is 100.kW. What
is the work done during the process ?
(a) 33-3 kW
(b) 100 k W
(c) 80 kW
(d) 20 kW
5. Measurement of temperature is based on

which law of thermodynamics ?
(a) Zeroth law of thermodynamics
(b) First law of thermodynamics
(c) Second law of thermodynamics
(d) Third law of thermadynarnics
Consider the following properties of
vapour :
1. Pressure
2. Temperature
3. Dryness fraction
4. Specific volume

Which of these two properties alone are not
sufficient to specify the condition of a
vapour ?
(a) 1 and 2
(b) 1 and 3
(c) 2 and 3
(d) 3 and 4

6. 85 kJ of heat is supplied to a dosed system
at constant volume. During the next
process, the system rejects 90 kJ of heat
at c~nstant pressure while 20 kJ of work
is done on it. The system is brought to
the original state by an adiabatic process.
The initial internal energy is 100 kJ. Then
what is the quantity of work transfer during
the process ?
(a) 30 kJ
(b) 25 kJ
(c) 20 kJ
(d) 15 kJ

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