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Mechanical Engineering
Engineering Thermodynamics
Quiz 14
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Q.1
The degree of saturation is the ratio of
(saturated specific humidity / actual specific humidity)^2
1/(saturated specific humidity * actual specific humidity)
saturated specific humidity / actual specific humidity
actual specific humidity / saturated specific humidity
Q.2
When humidity ratio of air air is said to be dehumidified.
increases
decreases
remains constant
none of the mentioned
Q.3
The total entropy of a mixture of gases is the of the partial entropies.
average
weighted mean
sum
difference of the highest and the lowest
Q.4
The expression which represents the pressure exerted by a gas is
nvrt
nrt/v
v/nrt
1/nvrt
Q.5
The slope of sublimation curve is the slope of the vaporization curve at triple point.
equal to
less than
greater than
none of the mentioned
Q.6
An application requires R-at −140°C. The triple-point temperature is −157°C. Find the pressure of the saturated vapour at the required condition.
0.0058 kpa
0.0098 kpa
0.0068 kpa
0.0088 kpa
Q.7
At the triple point, l(sublimation) = l(vaporization) – l(fusion).
true
false
Q.8
Water on melting and has the fusion curve with a slope.
contracts, negative
contracts, positive
expands, negative
expands, positive
Q.9
The properties of liquid with pressure.
do not vary
vary largely
vary little
none of the mentioned
Q.10
When does a vapour become superheated?
when the temperature of vapour is less than the saturation temperature at given pressure
when the temperature of vapour is more than the saturation temperature at given pressure
when the temperature of vapour is equal to the saturation temperature at given pressure
none of the mentioned
Q.11
The slopes of sublimation and vaporization curves for all substances are
negative
positive
zero
none of the mentioned
Q.12
The Clausius-Clapeyron equation is given by
dp/dt = l / t(vf+vi)
dp/dt = l / t(vf-vi)
dt/dp = l / t(vf+vi)
dt/dp = l / t(vf-vi)
Q.13
For proper utilization of exergy, it is desirable to make first law efficiency and the source and use temperatures should
as close to unity, be different
as close to unity, match
as close to zero, match
as close to zero, be different
Q.14
A pure substance which exists in a single phase has independent variables.
zero
one
two
three
Q.15
If a relation exists among variables x,y,z then z may be expressed as a function of x and y as, dz=Mdx+Ndy .
true
false
Q.16
If work is involved, Amin= and if heat is involved, Amin=
w, q(1+to/t)
w, q(1-to/t)
q(1+to/t), w
q(1-to/t), w
Q.17
If solar energy Qr is available at a reservoir storage temperature of Tr and if quantity of heat Qa is transferred by the solar collector at temperature Ta, then which of the following is true?
first law efficiency = qa/qr
second law efficiency = exergy output / exergy input
second law efficiency = (first law efficiency)*(1-to/ta)/(1-to/tr)
all of the mentioned
Q.18
1 mole of cyclohexane (z = 1.is filled in a container at 27oC and 4 atm, what is the volume of container?
3.8 liter
4.4 liter
5.6 liter
7.4 liter view answer
Q.19
With the concept of exergy available, which of the following is possible?
to analyse means of minimizing the consumption of available energy to perform a given process
to ensure most efficient possible conversion of energy
both of the mentioned
none of the mentioned
Q.20
Which of the following is true about compressibility of real gases?
z = 1
z < 1
z > 1
both z < 1 and z > 1 view answer
Q.21
The first law efficiency is defined as the ratio of the output energy to the input energy.
true
false
Q.22
The following also gave two-constant equations of state.
berthelot
dieterici
redlich-kwong
all of the mentioned
Q.23
The rate at which entropy is transferred out must the rate at which entropy enters the control volume.
be less than
equal to
exceed
none of the mentioned
Q.24
The temperature of feedwater leaving a heater is the saturation temperature at steam extraction pressure.
less than
equal to
more than
none of the mentioned
Q.25
The rate of entropy increase of the control volume or the net rate of entropy transfer to it.
exceeds or is less than
exceeds, is equal to
is less than, or equal to
none of the mentioned
Q.26
How many types of feedwater heaters are present?
one
two
three
four
Q.27
A simple Rankine cycle operates the Boiler at 3 MPa with an outlet temperature of 350°C and the Condenser atkPa. Assuming ideal operation and processes, what is the thermal efficiency of this cycle?
7.7
17.7
27.7
37.7
Q.28
Any thermodynamic process is accompanied by entropy generation.
true
false
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