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Quiz 9
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Q.1
A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
30 kJ
84 kJ
54 kJ
114 kJ
Q.2
Zeroth law of thermodynamics
Deals with conversion of mass and energy
Deals with reversibility and irreversibility of process
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Deals with heat engines
Q.3
Second law of thermodynamics defines
Heat
Work
Internal energy
Entropy
Q.4
Which of the following variables controls the physical properties of a perfect gas?
Pressure
Temperature
Volume
All of the above
Q.5
The value of one bar (in S. I. units) is equal to
1 × 102 N/m2
1 × 103 N/m2
1 × 104 N/m2
1 × 105 N/m2
Q.6
The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as
Enthalpy
Internal energy
Entropy
External energy
Q.7
Which of the following laws is applicable for the behaviour of a perfect gas?
Boyle's law
Charles ‘law
Gay Lussac’s law
All of the above
Q.8
Which of the following is a reversible non-flow process?
Isochoric process
Isobaric process
Hyperbolic process
All of these
Q.9
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that
Carnot cycle can't work with saturated steam
Heat is supplied to water at temperature below the maximum temperature of the cycle
A Rankine cycle receives heat at two places
Rankine cycle is hypothetical
Q.10
A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called
Isothermal process
Hyperbolic process
Adiabatic process
Polytropic process
Q.11
Diesel cycle consists of following four processes
Two isothermal and two isentropic
Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures
Q.12
Brayton cycle consists' of following four processes
Two isothermal and two isentropic
Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures
Q.13
The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
Equal to one
Less than one
Greater than one
None of these
Q.14
The principal constituents of a fuel are
Carbon and hydrogen
Oxygen and hydrogen
Sulphur and oxygen
Sulphur and hydrogen
Q.15
The compression ratio is the ratio of
Total volume to swept volume
Swept volume to clearance volume
Swept volume to total volume
Total volume to clearance volume
Q.16
When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called
Wood charcoal
Bituminous coal
Briquetted coal
None of these
Q.17
For reversible adiabatic process, change in entropy is
Maximum
Minimum
Zero
Negative
Q.18
If a system after undergoing a series of processes, returns to the initial state then
Process is thermodynamically in equilibrium
Process is executed in closed system cycle
Its entropy will change due to irreversibility
Sum of heat and work transfer will be zero
Q.19
The gas constant (R) is equal to the __________ of two specific heats.
Product
Sum
Difference
Ratio
Q.20
When the expansion or compression takes place according to the law pvn = C, the process is known as
Isothermal process
Adiabatic process
Hyperbolic process
Polytropic process
Q.21
The term N.T.P. stands for
Nominal temperature and pressure
Natural temperature and pressure
Normal temperature and pressure
Normal thermodynamic practice
Q.22
First law of thermodynamics deals with
Conservation of heat
Conservation of momentum
Conservation of mass
Conservation of energy
Q.23
The value of n = 1 in the polytropic process indicates it to be
Reversible process
Isothermal process
Adiabatic process
Irreversible process
Q.24
The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)
Q1 - 2 = dU + W1 - 2
Q1 - 2 = dU - W1 - 2
Q1 - 2 = dU/W1 - 2
Q1 - 2 = dU × W1 - 2
Q.25
Otto cycle consists of following four processes
Two isothermal and two isentropic
Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures
Q.26
A perpetual motion machine is
A thermodynamic machine
A non-thermodynamic machine
A hypothetical machine
A hypothetical machine whose operation would violate the laws of thermodynamics
Q.27
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
O₂, N₂, steam, CO₂
O₂, N₂, water vapour
SO₂, NH₃, CO₂, moisture
O₂, N₂, H₂, air
Q.28
In order that a cycle be reversible, following must be satisfied
Free expansion or friction resisted expansion/compression process should not be encountered
When heat is being absorbed, temperature of hot source and working substance should be same
When beat is being rejected, temperature of cold source and working substance should be same
All of the above
Q.29
The standard value of atmospheric pressure taken at sea level is
1.013 bar
760 mm of Hg
1013 × 102 N/m2
All of these
Q.30
Which law states that the internal energy of a gas is a function of temperature?
Charles' law
Joule's law
Boyle's law
There is no such law
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