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Engineering Thermodynamics
Quiz 6
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Q.1
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
Feasible
Impossible
Possible
Possible, but with lot of sophistications
Q.2
The absolute zero pressure can be attained at a temperature of
0°C
-273°C
273 K
None of these
Q.3
Molecular volume of any perfect gas at 600 × 10
3
N/m² and 27°C will be
4.17 m3/kg mol
400 m3/kg mol
0.15 m3/kg mol
41.7 m3/kg mol
Q.4
If value of n is infinitely large in a polytropic process pVn = C, then the process is known as constant
Volume
Pressure
Temperature
Enthalpy
Q.5
The unit of universal gas constant is
None of the above
Q.6
In S. I. units, the value of the universal gas constant is
8.314 J/kg mole-K
83.14 J/kg mole-K
831.4 J/kg mole-K
8314 J/kg mole-K
Q.7
General gas equation is
PV=nRT
PV=mRT
PV = C
PV=KiRT
Q.8
Petrol is distilled at
65° to 220°C
220° to 345°C
345° to 470°C
470° to 550°C
Q.9
The volumetric or molar specific heat at constant pressure is the product of
Molecular mass of the gas and the specific heat at constant volume
Atomic mass of the gas and the gas constant
Molecular mass of the gas and the gas constant
None of the above
Q.10
In a Carnot cycle, heat is transferred at
Constant pressure
Constant volume
Constant temperature
Constant enthalpy
Q.11
The pressure exerted by an ideal gas is ________ of the kinetic energy of all the molecules contained in a unit volume of gas.
One-third
Three-forth
One-half
Two-third
Q.12
For which of the following substances, the gas laws can be used with minimum error
Dry steam
Wet steam
Saturated steam
Superheated steam
Q.13
The condition for the reversibility of a cycle is
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
All the processes, taking place in the cycle of operation, must be extremely slow
The working parts of the engine must be friction free
All of the above
Q.14
The value of gas constant (R) in S. I. units is
0.287 J/kgK
2.87 J/kgK
28.7 J/kgK
287 J/kgK
Q.15
In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
Isothermal
Isentropic
Polytropic
None of these
Q.16
The hard coke is obtained when carbonization of coal is carried out at
500° to 700°C
700° to 900°C
300° to 500°C
900° to 1100°C
Q.17
The first law of thermodynamics is the law of
Conservation of mass
Conservation of energy
Conservation of momentum
Conservation of heat
Q.18
Stirling and Ericsson cycles are
Quasi-static cycles
Reversible cycles
Semi-reversible cycles
Irreversible cycles
Q.19
The unit of energy is S. I. units is
Joule (J)
Joule meter (Jm)
Watt (W)
Joule/meter (J/m)
Q.20
The universal gas constant (or molar constant) of a gas is the product of
Molecular mass of the gas and the gas constant
Atomic mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the specific heat at constant volume
Q.21
The behavior of super-heated vapour is similar to that of
Perfect gas
Air
Steam
Ordinary gas
Q.22
Which of the following has the minimum atomic mass?
Sulphur
Nitrogen
Oxygen
Carbon
Q.23
Heat and work are
Point functions
System properties
Path functions
Intensive properties
Q.24
The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is
29.27 kgfm/mol °K
8314 kgfm/mol °K
848 kgfm/mol °K
427 kgfm/mol °K
Q.25
A sudden fall in the barometer reading is a sign of approaching
Fine weather
Rains
Storm
Cold wave
Q.26
If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
Temperature
Enthalpy
Internal energy
Entropy
Q.27
During throttling process
Heat exchange does not take place
No work is done by expanding steam
There is no change of internal energy of steam
All of the above
Q.28
Universal gas constant is defined as equal to product of the molecular weight of the gas and
Specific heat at constant pressure
Specific heat at constant volume
Ratio of two specific heats
Gas constant
Q.29
The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when
Flow is uniform and steady
Process is isentropic
Process is isothermal
Process is isentropic and specific heat does not change with temperature
Q.30
A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
-140 kJ
-80 kJ
-40 kJ
+60 kJ
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