According to Kelvin-Plank's statement, a
perpetual motion machine of ________ .
A heat engine receives 1000 kJ of heat
and produces 600 kJ of work. The amount of heat rejected in kJ and the
efficiency percentage of the engine, respectively will be
A heat engine is a device
that operates on a thermodynamic cycle
A reversible heat engine
working at the rate of 100 kW has an efficiency of 20%. The magnitudes of heat
transfer rate from the source and to the sink in kW would be, respectively.
A heat engine is supplied with 278 kW of
heat at a constant fixed temperature of 283o C and the heat
rejection takes place at 5o C The engine is reversible if the heat rejected, in
kW, is:
For an irreversible
thermodynamic cycle:
The maximum efficiency that a heat engine operating
between 327o C and 24o C, can be
A steam
nozzle converts
For a thermodynamic cycle
to be irreversible, it is necessary that
Second law of thermodynamic
define :
The efficiency of Carnot cycle is maximum for
:
The efficiency of a carnot
engine depends on
With
respect to the first law of thermodynamics, which of the following statements
is the most relevant?
Identify the complete and correct statement of the
first law of thermodynamics.
Which
of the following statements is correct with reference to perpetual motion
machines of the first kind?
In
a non-flow process, work transfer from the system is 30 kJ and heat received by
the system is 90 kJ. Determine the change in the internal energy.
What
is the work done for a constant volume process?
In a throttling process with negligible change
in the potential and kinetic energies:
The work extracted from the system is equal to the heat provided to the system. Which of the following is TRUE for the energy of the system?
For what type of process the change in
internal energy is equal to the heat transferred?
Which of the following statements hold
true for the first law of thermodynamics?
In a cyclic process, the
work done by the system is 20 kJ, – 30 kJ, – 5 and 10 kJ. What is the total
heat transfer (kJ) for the cyclic process?
What is the value of 
The work extracted from the
system is less than the heat provided to the system. Which of the following is
TRUE for the energy of the system?
Which of the following equation is/are
CORRECT for a completely closed cyclic process?
For constant ________ process,
the change in internal energy in a reversible process is equal to heat
transferred.
A liquid of mass 1.5 kg with specific heat of 3 kJ/kgK is stirred causing the temperature rise of . What is the work done (in kJ) for the process, if the system is insulated?
In a cyclic process, the
heat transfers are 15 kJ, – 23 kJ, – 3 kJ and 40 kJ. What is the net-work (in kJ) for the
cyclic process?
If Carnot engine rejects half of the
heat absorbed form the reservoir (heat source). What is the efficiency of
Carnot engine?
Which equation is the CORRECT representation of the process shown below?
The heat interaction of the system is a
function of temperature only 
. If the system does a work of 2 kj / K . What is the increase in internal energy per degree
temperature?
For any gas
The heat absorbed or
rejected during a polytrophic process is equal to
What happens when the heat supplied to
the system is more than the work transfer out of the system?
For a process which is non-flow, the first
law of thermodynamics states________ .
A heat engine performs a work of 100 kJ per cycle. The efficiency of the engine is 50%. What will be the amount of heat rejected per cycle?
Which equation best
describes the first law of thermodynamics?
A gas is
compressed frictionless from an initial state of ym3 and 1 MPa to a final state
of 0.2 m3 and 1 MPa. There is a transfer of 40 kJ of heat from the
gas and a drop of 20 kJ in internal energy. What is the initial state volume of
the gas?
What processes does Carnot
cycle consist of?
For a process which is non-flow (U is the internal energy, Q is the heat and W is the work done) the first law of thermodynamics states________ .
The work done by a system is 45 kJ. If the internal energy of the system is decreased by 15 kJ. What is the heat received by the system?
The internal energy of the system is a function of
temperature only U = 30 + 0.5t kj U.
If the system does the work of 0.5 kj / K. What is the increase in heat interaction
per degree temperature?
If a heat engine produces
work without the consumption of energy, then what kind of machine is this?
A gas is compressed frictionless from an
initial state of 0.4m3 and 0.1 MPa to a final state of 0.2 m2
and 0.1 MPa. There is a transfer of 35 kJ of heat from the gas. What is the
change in internal energy (in kJ)?
एक गैस को 0.4m3 और 0.1 MPa की प्रारंभिक अवस्था से 0.2 m3 और 0.1 MPa की अंतिम अवस्था तक घर्षण रहित संपीड़ित किया जाता है। गैस से 35 kJ ऊष्मा का स्थानांतरण होता है। आंतरिक ऊर्जा में परिवर्तन (kJ में) क्या है?
The ratio of the specific heat at
constant pressure to specific heat at constant volume for air is equal to
Total heat supplied at constant volume is
In a polytrophic process
It is proposed to make a direct heat to work converter out of an elementary system which absorbs heat while doing isothermal work exactly equal to the heat absorbed, thereby keeping internal energy constant. Such a system is
First law of thermodynamics
Which of the following
represents the perpetual motion of the first kind