Engineering service (Mech) Mechanical question papers

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1. Along the ‘triple line in a p- v diagram showing all three phases of water, which one of the following statements is“ correct ?
(a) A substance has the same pressure
and temperature but different
specific volume . -
‘ (b) A substance has same temperature
and specific volume but different
pressure
(c) A substance has same specific
volume and pressure but different
temperature ,
(d), A substance has same specific


2. In a cyclic process, the heat transfer
are +30 J, —50 J, —10.l and +60]. The
network for the cyclic process is
(a) 30 Nm
(by 40 Nm
(0) 50 Nm,
(d) 60 Nm

3. A researcher Claims that he has
developed an engine, which while
working between source and sink
temperatures of 377°C and 27°C rejects
only 50% of absorbed heat. What will
his engine be ? '
7 (a) An impossible engine
(b) A Stirling engine
(0) A reversible engine
(d) A practical engine


4. A reversible engine works between
temperature limits of 260°C and 60°C. 1
To improve the performance, we have to
(a) Raise the source temperature to
300°C
(b) Lower the sink temperature to 30°C
(c) Iiisulate the engine
(d) None 'of the above


5. In a real gas equation pv = zRT, depend- ‘
ing on the values of pressure and
temperature of the real gas, the value
of z
(a) Should always be less than 1
(b) May be less than 1, may be greater
than 1 or equal to 1
(0) Should always be greater than 1
(d) Should always be equal-to l '

6. A system executes a cyclic process
during which there are two processes as
given below :
.Q2 = 460 kJ, 2Q, = —100 RI, and
IW2 = 210 kl
What will be work interaction in process
zWi 7
(a) 100 k]
(b) , —210 to
(c) 1501s
(d) —150 kJ


7. For the same compression ratio; the _
efficiency of an air standard Otto cycle
is '
(a) More than the efficiency of an air
standard Diesel cycle.
(b) Less than the efficiency of an air
standard Diesel cycle 0
(c) Equal to the efficiency of an air
standard Diesel cycle
(d) None of the above

8. A Carnot engine operates between 37°C
and 347°C. If the engine produces
620kJ of work, the entropy change“
during heat addition is
(a) l kJ/K
(b) 2 kJ/K
(c) 3 kI/K
(d) 4 was

9.An amount of 1000 k] of heat is_‘added
to a system during a constant pressure
vapourization process at a temperature of -
227°C. The available energy added to
the system, if the temperature of the
surroundings is 27°C, is
(a) 600 kl
(b) 5001s“
(0) 400k]
(d) 300 kJ

10.Consider the following statements :
1. In an ideal gas, there are no inter
molecular‘ forces of attraction and
repulsion.
2. At very low pressure, all gases
and vapours approach ideal gas
behaviour.
3. Enthalpy of an ideal gas depends
only on temperature.
Which of the above- statements are
correct?
(a) 1, 2 and 3
(b) l and 2 only
(c) l' and 3 only
(d) 2 and 3 only


11. A Carnot heat pump works between18.27°C and 327°C. What will be its COP ?
(a) 009
(b) 1'00
(c)? 109
(a) 2-0

12. In a two-fluid heat exchanger, the inlet and outlet temperatures of the hot fluid are 65°C and 40°C respectively. For the cold fluid, these are 15°C and 43°C. The
heat exchanger is a
(a) Parallel-flow heat exchanger
(b) Counter flow heat exchanger
(0) Mixed flow heat exchanger
(d) Phase-change heat exchanger

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Ice kept in a will insulated them0 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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