Thermodynamics is the science of
A system is in thermodynamics equilibrium when
A system is said to have undergone a cycle if
Minimum number of process to undergo a cycle is
A process is said to be Quasistatic if
The engines which are operating on gas power cycle are called
The air standard Otto cycle comprises
For same compression ratio;
The cycle which consists of two reversible isotherms and two reversible isochores is called as:
Thermal efficiency of closed cycle gas turbine plant increases by
A reversible thermodynamic cycle containing only three processes and producing work is to be constructed. The constraints are
(i) There must be one isothermal process,
(ii) There must be one isentropic process,
(iii) The maximum and minimum cycle pressure and the clearance volume are fixed,
(iv) Polytropic processes are not allowed.
Then the number of possible cycles are:
The following four figures have been drawn to represent a fictitious thermodynamic cycle, on the P-V and T-S planes:
According to the first law of thermodynamics, equal areas are enclosed by
Which of the following relationship is valid only for reversible process undergone by a closed system of simple compressible substance (neglect changes in kinetic and potential energy)?
A cylinder contains 5 m3 of an ideal gas at a pressure of 1 bar. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this process is:
Which one of the following represents open thermodynamic system?
A heat engine using lake water at 12° C as source and the surrounding atmoshphere at 2° C as sink executes 1080 cycles per minute. If amount of heat supplied per cycle is 57 J, what is the output of the engine?
The following are examples of some intensive and extensive properties:
1. Pressure
2. Temperature
3. Volume
4. Velocity
5. Electric charge
6. Magnetisation
7. Viscosity
8. Potential energy
Which one of the following sets gives the correct combination of intensive and extensive properties?
A Carnot cycle is having an efficiency of 0.75. If the temperature of the high temperature reservoir is 727° C. What is the temperature of low temperature reservoir?
For a heat engine operating on the Carnot cycle, the work output is ¼ th of the heat transferred to the sink. The efficiency of the engine is:
For an engine operating on air standard Otto cycle, the clearance volume is 10% of the swept volume. The specific heat ratio of air is 1.4. The air standard cycle efficiency is:
A heat engine working on Carnot cycle receives heat at the rate of 40 kW from a source at 1200 K and rejects it to a sink at 300 K. The heat rejected is
In a cyclic process, heat transfers are +14.7 kJ, -25.2 kJ, -3.56 kJ and +31.5 kJ. What is the net work for this cyclic process?
A cyclic heat engine does 50 kJ of work per cycle. If the efficiency of the heat engine is 75%, the heat rejected per cycle is:
A Carnot engine uses nitrogen as the working fluid (γ = 1.4). The heat supplied is 52 kJ and adiabatic expansion ratio 32:1. The receiver temperature is 295 K. What is the amount of heat rejected?
In a heat engine operating in a cycle between a source temperature of 606°C and a sink temperature of 20°C, what will be the least rate of heat rejection per kW net output of the engine?
