1111 Flashcards
1A definite area or space where some thermodynamic process takes place is
known as
A. Thermodynamic system
B. Thermodynamic cycle
C. Thermodynamic process
D. thermodynamic law.
A. Thermodynamic system
2An open system is one in which
A. Heat and work cross the boundary of the system, but the mass of the working
substance does not
B. Mass of working substance crosses the boundary of the system but the heat and
work do not
C. Both the heat and work as well as mass of the working substances cross the
boundary of the system
D. Neither the heat and work nor the mass of the working substances cross the
boundary of the system.
C. Both the heat and work as well as mass of the working substances cross the
boundary of the system
3An isolated system
a specified region where transfer of energy and/or mass takes place
Is a region of constant mass and only energy is allowed to cross the boundaries.
Cannot transfer either energy or mass to or from the surroundings
Is one in which mass within the system is not necessarily constant
Cannot transfer either energy or mass to or from the surroundings
4In an extensive property of a thermodynamic system
Extensive heat is transferred
extensive work is done
all of the above
None of these
Is
None of these
5Which of the following is an intensive property of a thermodynamic system?
Volume
Temperature
Mass
Energy
Temperature
6Which of the following is the extensive property of a thermodynamic system?
Pressure
Volume
Temperature
Density.
Volume
7When two bodies are in thermal equilibrium with a third body they are also in
thermal equilibrium with each other. This statement is called
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kelvin Planck’s law
Zeroth law of thermodynamics
8The temperature at which the volume of a gas becomes zero is called
Absolute scale of temperature
absolute zero temperature
Absolute temperature
none of the above.
absolute zero temperature
9The value of one bar (in SI units) is equal to
100 N/m2
1000 N/m2
1 x 104 N/m2
1 × 105 N/m2
1 × 105 N/m2
10The absolute zero pressure will be
When molecular momentum of the system becomes zero
At sea level
At the temperature of -273 K
under vacuum conditions
When molecular momentum of the system becomes zero
11Absolute zero temperature is taken as
-273°C
273°C
237°C
-373°C.
-273°C
12Which of the following is correct?
Absolute pressure gauge pressure + atmospheric pressure
Gauge pressure = absolute pressure + atmospheric pressure
Atmospheric pressure absolute pressure + gauge pressure
Absolute pressure gauge pressure - atmospheric pressure.
Absolute pressure gauge pressure + atmospheric pressure
13The unit of energy in SI units is
Joule (J)
Joule meter (Jm)
Watt (W)
Joule/meter (J/m).
Joule (J)
140ne watt is equal to
1 Nm/s
1 N/min
10 N/s
100 Nm/s
1 Nm/s
150ne joule (J) is equal to
1 Nm
1kNm
10 Nm/s
10 kNm/s.
1 Nm
16The amount of heat required to raise the temperature of 1 kg of water
through 1°C is called
Specific heat at constant volume
specific heat at constant pressure
Kilo calorie
none of the above.
Kilo calorie
17The heating and expanding of a gas is called
Thermodynamic system
Thermodynamic cycle
Thermodynamic process
Thermodynamic law.
Thermodynamic cycle
18A series of operations, which take place in a certain order and restore the
initial condition, is known as
Reversible cycle
irreversible cycle
Thermodynamic cycle
none of the above.
Thermodynamic cycle
19The condition for the reversibility of a cycle is
All the processes, taking place in the cycle of operation, must be extremely slow
The working parts of the engine must be friction free
There should be no loss of energy during the cycle of operation
All of the above.
All of the above.
20In an irreversible process, there is a
Loss of heat
no loss of heat
gain of heat
no gain of heat.
Loss of heat
21The main cause of the irreversibility is
Mechanical and fluid friction
unrestricted expansion
Heat transfer with a finite temperature difference
all of the above
all of the above
24lf all the variables of a stream are independent of time it is said to be in
Steady flow
unsteady flow
uniform flow
closed flow
Steady flow
25A control volume refers to
A fixed region in space
a specified mass
An isolated system
a reversible process only
A fixed region in space
