1) Which
of the following is an intensive property of a thermodynamic system?
a) Mass
b) Temperature
c) Energy
d) Volume
2) The
absolute zero pressure will be
a) At
a temperature of -273 K
b) At
sea level
c) When
molecular momentum of the system becomes zero
d) Under
vacuum conditions
e) All
of the above
3) Which
of the following statement is true?
a) Boiling
point of water decreases with increasing pressure
b) Freezing
temperature of water decreases with increasing pressure
c) Specific
volume of water decreases on freezing
d) All
of the above
4) Which
of the following statement is true?
a) The
slope of vaporisation curve is always positive
b) The
slope of fusion curve is positive for all pure substances
c) The
slope of sublimation curve is negative for all pure substances
d) The
slope of vaporisation curve is always negative
5) At
critical point the latent heat of vaporisation is
a) Greater
than zero
b) Equal
to zero
c) Less
than zero
d) None
of the above
6) What
will happen when the pressure of feed water is increased?
a) Boiling
point of water decreases and enthalpy of evaporation increases
b) Boiling
point of water increases and enthalpy of evaporation decreases
c) Boiling
point of water increases and enthalpy of evaporation increases
d) None
of these
7) For
which of the following instances the throttling calorimeter can be used alone.
a) Very
low dryness fraction upto 0.7
b) Dryness
fraction of only low pressure steam
c) High
dryness fraction upto 0.98
d) Throttling
calorimeter cannot be used alone
8) In
throttling process
a) h12
= h2
b) h1
= h2
c) h1
= h2 hfg/Ts
d) h2
= h1 + hfg/Ts
9) An
isentropic process is always:
a) Reversible
and adiabatic.
b) Frictionless.
c) Reversible
and isothermal.
d) Irreversible
and adiabatic.
10) Among
the following which is not property of the system?
a) Pressure.
b) Temperature.
c) Heat.
d) Specific
volume.
11) In
isothermal process:
a) Change
in internal energy is zero.
b) Pressure
remains constant.
c) Volume
remains constant.
d) Enthalpy
change is maximum.
12) What
do the second law of thermodynamics defines?
a) Heat.
b) Work.
c) Entropy.
d) Internal
energy.
13) The
efficiency of the Carnot engine …………………., if the temperature of the source is
increased.
a) Does
not change.
b) Increases.
c) Decreases.
d) Depends
on other factors.
14) On
what does the efficiency of an ideal Carnot engine depends?
a) The
working substance.
b) The
construction of engine.
c) The
temperature of the sink only.
d) The
temperatures of both the source and the sink.
15) Kelvin
– Planck’s law deals with:
a) Conservation
of heat.
b) Conservation
of energy.
c) Conversion
of work into heat.
d) Conversion
of heat into work.
16) For
saturated air:
a) Wet
bulb depression is negative.
b) Wet
bulb depression can be either positive or negative.
c) Wet
bulb depression is positive.
d) Wet
bulb depression is zero.
17) Enthalpy
………………….. during sensible heating of moist air.
a) Increases.
b) Decreases.
c) Remains
constant.
d) None
of the above.
18) Which
among the following statement is correct?
a) Evaporative
cooling is a cooling and humidification process.
b) Evaporative
cooling is a cooling and dehumidification process.
c) Evaporative
cooling and sensible cooling is the same.
d) Evaporative
cooling is not effective for hot and dry climates.
19) What
does Orsat apparatus gives?
a) Volumetric
analysis of products of combustion including H2O.
b) Gravimetric
analysis of products of combustion including H2O.
c) Gravimetric
analysis of the dry products of combustion.
d) Volumetric
analysis of the dry products of combustion.
20) Bomb
calorimeter is used to find the calorific value of ……………… fuels.
a) Solid.
b) Gaseous.
c) Solid
and gaseous.
d) None
of the above.
21) Rankine
cycle operating on low pressure limit of p1 and high pressure limit p2:
a) May
be more or less depending upon the magnitudes of p1 and p2.
b) Has
lower thermal efficiency than Carnot cycle operating between same pressure
limit.
c) Has
same thermal efficiency as Carnot cycle operating between same pressure limits.
d) Has
higher thermal efficiency than the Carnot cycle operating between same pressure
limits.
22) What
does Rankine cycle comprises of?
a) Two
isothermal processes and two constant pressure processes.
b) Two
isentropic processes and two constant pressure processes.
c) Two
isentropic processes and two volume pressure processes.
d) None
of the above.
23) The
maximum percentage gain in thermal efficiency of regenerative feed heating
cycle
a) Remains
same unaffected by number of feed heaters.
b) Decreases
with number of feed heaters increasing.
c) Increases
with number of feed heaters increasing.
d) None
of the above.
24) How
is the thermal efficiency of a gas turbine plant as compared to diesel engine
plant?
a) Lower.
b) Higher.
c) Same.
d) None
of these
25) For
theoretical Otto cycle the work output
a) Increases
with increase in pressure ratio.
b) Increases
with increase in compression ratio.
c) Increases
with increase in adiabatic index ?.
d) Follows
all of the above.
26) For
same compression ratio
a) Thermal
efficiency of Otto cycle cannot be predicted.
b) Thermal
efficiency of Otto cycle is same as that for diesel cycle.
c) Thermal
efficiency of Otto cycle is less than that of diesel cycle.
d) Thermal
efficiency of Otto cycle is greater than that of diesel cycle.
27) Greater
the difference between jet velocity and aeroplane velocity
a) Greater
is the propulsive efficiency.
b) Less
is the propulsive efficiency.
c) Unaffected
is the propulsive efficiency.
d) None
of these.
28) If
the cut-off is decreased the efficiency of diesel cycle
a) Increases.
b) Decreases.
c) Remains
unchanged.
d) Any
of the above.
29) First
law of thermodynamics deals with conservation of
a) Momentum.
b) Mass.
c) Energy.
d) Heat.
30) For
any thermodynamic process the area under the T-s diagram represents
a) Heat
absorbed only.
b) Heat
rejected only.
c) Work
done during the process.
d) Heat
absorbed or rejected.
31) The
external work done is not equal to zero in
a) Throttling.
b) Free
expansion.
c) Constant
volume process.
d) Constant
pressure process
32) The
extension and compression of a helical spring is an example of
a) Isothermal
process.
b) Reversible
process.
c) Irreversible
process.
d) Adiabatic
process
33) Entropy
of universe
a) Tends
to a minimum.
b) Tends
to a maximum.
c) Tends
to zero.
d) None
of the above.
34) Cetane
number of a diesel fuel is a measure of its ………………..
a) Delay
period.
b) Viscosity.
c) Volatility.
d) Ignition
quality.
35) The
work done is equal to the change in internal energy of a gas for
a) Adiabatic
process.
b) Isothermal
process.
c) Constant
volume process.
d) Constant
pressure process.
36) What
will the same volume of all gases represent?
a) Specific
gravity.
b) Densities.
c) Specific
weights.
d) Molecular
weights.
37) Universal
gas constant is defined as the product of the molecular weight of the gas and
a) Gas
constant.
b) Specific
heat at constant volume.
c) Specific
heat at constant pressure.
d) Ratio
of two specific heats
38) During
a throttling process
a) Exchange
of heat does not take place.
b) Expanding
steam does no work.
c) Internal
energy of steam does not change.
d) All
of the above.
39) A
Bell – Coleman cycle is a reversed ……………….cycle.
a) Brayton.
b) Otto.
c) Joule.
d) Carnot.
40) All
gases behave ideally under which of the following conditions?
a) High
pressure conditions.
b) Low
pressure conditions.
c) Vacuum
conditions.
d) All
of these.
41) Which
among the following statement is incorrect for calculating air standard
efficiency?
a) Gases
dissociate at higher temperatures.
b) Working
substance is perfect gas.
c) All
processes are reversible.
d) Specific
heat remains constant at all temperatures.
42) Theoretically,
a petrol engines operates on …………..cycle.
a) Constant
entropy.
b) Constant
pressure.
c) Constant
volume.
d) Constant
temperature
43) ………………is
the unit of entropy.
a) J/Kg
b) J/Kg
K
c) J/K
d) J/Kgs
44) Resultant
entropy of the system will …………….when two gases suddenly mix up with each
other.
a) Remain
unaltered.
b) Decrease.
c) Increase.
d) Become
zero.
45) For
any irreversible process the net entropy change is
a) Unity.
b) Infinite.
c) Negative.
d) Positive.
46) Internal
energy and enthalpy of an ideal gas are functions of
a) Temperature
only
b) Pressure
only
c) Specific
volume only
d) Temperature
and pressure
47) For
real gases, cp will be equal to cv
a) At
triple point
b) At
critical temperature
c) At
absolute zero
d) Above
critical te
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