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Engineering Thermodynamics
Quiz 12
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Q.1
Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.
1/27
th
1/93
th
1/173
th
1/273
th
Q.2
When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is
Coke
Wood charcoal
Bituminous coal
Briquetted coal
Q.3
In an extensive property of a thermodynamic system
Extensive heat is transferred
Extensive work is done
Extensive energy is utilized
None of these
Q.4
The more effective way of increasing efficiency of Carnot engine is to
Increase higher temperature
Decrease higher temperature
Increase lower temperature
Decrease lower temperature
Q.5
The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents
Heat absorbed
Heat rejected
Either heat absorbed or heat rejected
None of these
Q.6
For same compression ratio and for same heat added
Otto cycle is more efficient than Diesel cycle
Diesel cycle is more efficient than Otto cycle
Efficiency depends on other factors
Both Otto and Diesel cycles are equally efficient
Q.7
The natural solid fuel is
Wood
Coke
Pulverised coal
Anthracite coal
Q.8
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
δQ = T.ds
δQ = T/ds
dQ = ds/T
None of these
Q.9
The efficiency of a gas turbine is given by
(Net work output)/(Work-done by the turbine)
(Net work output)/(Heat supplied)
(Actual temperature drop)/(Isentropic temperature drop)
(Isentropic increase in temperature)/(Actual increase in temperature)
Q.10
One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
4/7
11/4
9/7
All of these
Q.11
The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents
Heat absorbed
Heat rejected
Either (A) or (B)
None of these
Q.12
The main cause for the irreversibility is
Unrestricted expansion
Mechanical and fluid friction
Heat transfer with a finite temperature difference
All of the above
Q.13
The isothermal and adiabatic processes are regarded as
Reversible process
Irreversible process
Reversible or irreversible process
None of these
Q.14
An adiabatic process is one in which
The temperature of the gas changes
No heat enters or leaves the gas
The change in internal energy is equal to the mechanical work done
All of the above
Q.15
Isochoric process is one in which
Free expansion takes place
Very little mechanical work is done by the system
No mechanical work is done by the system
All parameters remain constant
Q.16
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called
Free expansion
Hyperbolic expansion
Adiabatic expansion
Parabolic expansion
Q.17
The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
pv = mRT
pv = RTm
pvm = C
pv = (RT)m
Q.18
The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)
mR (T2 - T1)
mcv (T2 - T1)
mcp (T2 - T1)
mcp (T2 + T1)
Q.19
Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)
cv/ cp =R
cp - cv = R
cv = R/ γ-1
Both (B) and (C)
Q.20
Those substances which have so far not been resolved by any means into other substances of simpler form are called
Atoms
Compounds
Elements
Molecules
Q.21
The efficiency of Carnot cycle depends upon
Temperature limits
Volume compression ratio
Cut-off ratio and compression ratio
Pressure ratio
Q.22
One kg of hydrogen requires 8 kg of oxygen and produces
1 kg of water
7 kg of water
8 kg of water
9 kg of water
Q.23
One kg of carbon monoxide requires 4/7 kg of oxygen and produces
11/3 kg of carbon dioxide gas
7/3 kg of carbon monoxide gas
11/7 kg of carbon dioxide gas
8/3 kg of carbon monoxide gas
Q.24
In a free expansion process,
W1 - 2 = 0
Q1 - 2 = 0
dU = 0
All of these
Q.25
The efficiency of the Carnot cycle may be increased by
Increasing the highest temperature
Decreasing the highest temperature
Increasing the lowest temperature
Keeping the lowest temperature constant
Q.26
Carnot cycle efficiency is maximum when
Initial temperature is 0°K
Final temperature is 0°K
Difference between initial and final temperature is 0°K
Final temperature is 0°C
Q.27
An adiabatic wall is one which
Prevents thermal interaction
Permits thermal interaction
Encourages thermal interaction
Discourages thermal interaction
Q.28
The efficiency of Diesel cycle depends upon
Pressure ratio
Cut-off ratio and compression ratio
Temperature limits
Compression ratio
Q.29
The work ratio of simple gas turbine cycle depends upon
Maximum cycle temperature
Minimum cycle temperature
Pressure ratio
All of these
Q.30
The polytropic index (n) is given by
log (p1p2)/log (v1v2)
log (p2/ p1)/log (v1/ v2)
log (v1/ v2)/ log (p1/p2)
log [(p1v1)/(p2v2)]
0 h : 0 m : 1 s
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