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Quiz 2
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Q.1
Select the wrong statement
A Joule cycle consists of two constant volume and two isentropic processes.
An Otto cycle consists of two constant volume and two isentropic processes.
An Ericsson cycle consists of two constant pressure and two isothermal processes.
All of the above
Q.2
The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by
Kelvin
Joule
Clausis
Gay-Lussac
Q.3
The change of entropy, when heat is absorbed by the gas, is
Positive
Negative
Positive or negative
None of these
Q.4
When gas is heated at constant pressure, the heat supplied is utilized in
Increasing the internal energy of gas
Doing some external work
Increasing the internal energy of gas and also for doing some external work
None of the above
Q.5
Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kinetic theory of gases
Q.6
The heat energy stored in the gas and used for raising the temperature of the gas is known as
External energy
Internal energy
Kinetic energy
Molecular energy
Q.7
According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
Remains constant
Increases
Decreases
None of these
Q.8
In an isothermal process, the internal energy
Increases
Decreases
Remain constant
First increases and then decreases
Q.9
Calorie is a measure of
Specific heat
Quantity of heat
Thermal capacity
Entropy
Q.10
Kerosene is distilled at
65° to 220°C
220° to 345°C
345° to 470°C
470° to 550°C
Q.11
One Joule (J) is equal to
1 kN-m
1 N-m
10 kN-m/s
10 N-m/s
Q.12
Reversed joule cycle is called
Carnot cycle
Rankine cycle
Brayton cycle
Bell Coleman cycle
Q.13
Reversed Joule cycle is known as
Carnot cycle
Bell-Coleman cycle
Rankine cycle
Stirling cycle
Q.14
The entropy __________ in an irreversible cyclic process.
Remains constant
Decreases
Increases
None of these
Q.15
The pressure of a gas in terms of its mean kinetic energy per unit volume 'E' is equal to
E/3
E/2
3E/4
2E/3
Q.16
The same volume of all gases would represent their
Densities
Specific weights
Molecular weights
Gas characteristic constants
Q.17
If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
More
Less
Equal
Depends on other factors
Q.18
The efficiency of Diesel cycle with decrease in cut-off
Increases
Decreases
First increases and then decreases
First decreases and then increases
Q.19
Otto cycle consists of
Two constant volume and two isentropic processes
Two constant pressure and two isentropic processes
Two constant volume and two isothermal processes
One constant pressure, one constant volume and two isentropic processes
Q.20
Properties of substances like pressure, temperature and density, in thermodynamic coordinates are
Path functions
Point functions
Cyclic functions
Real functions
Q.21
Which of the following processes are thermodynamically reversible?
Throttling
Free expansion
Constant volume and constant pressure
Isothermal and adiabatic
Q.22
The efficiency of Diesel cycle approaches to Otto cycle efficiency when
Cut-off is decreased
Cut-off is constant
Cut-off is increased
Cut-off is zero
Q.23
According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.
Change
Do not change
Both (A) and (B)
None of these
Q.24
The natural petroleum may be separated into
Petrol
Kerosene
Fuel oil
Lubricating oil
Q.25
One kg of carbon requires 4/3 kg of oxygen and produces ________ kg of carbon monoxide gas.
8/3
7/3
11/7
11/3
Q.26
The compression ratio for Diesel engines is
15 to 20
5 to 8
3 to 6
20 to 30
Q.27
The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
(T1/T2) - 1
1 - (T1/T2)
1 - (T2/T1)
1 + (T2/T1)
Q.28
Stirling cycle consists of
Two constant volume and two isentropic processes
Two constant volume and two isothermal processes
Two constant pressure and two isothermal processes
One constant volume, one constant pressure and two isentropic processes
Q.29
Carnot cycle consists of
Two constant volume and two isentropic processes
Two isothermal and two isentropic processes
Two constant pressure and two isentropic processes
One constant volume, one constant pressure and two isentropic processes
Q.30
When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
Zero
1/5
4/5
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