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Start Add example file. An isolated system is one in which a mass does not cross boundaries of the system, though energy may do so b neither mass nor energy crosses the boundaries of the system c both energy and mass cross the boundaries of the system d mass crosses the boundary but not the energy e thermodynamic reactions do not occur. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are a path functions b point functions c cyclic functions d real functions e thermodynamic functions.
Which of the following quantities is not the property of the system a pressure b temperature c specific volume d heat e density. Mixture of ice and water form a a closed system b open system c isolated system d heterogeneous system e thermodynamic system. Which of the following is the property of a system a pressure and temperature b internal energy c volume and density d enthalpy and entropy e all of the above. On weight basis, air contains following parts of oxygen a 21 b 23 c 25 d 73 e Which of the following is not the intensive property a pressure b temperature c density d heat e specific volume.
Which of the following items is not a path function a heat b work c kinetic energy d vdp e thermal conductivity.
Work done in an adiabatic process between a given pair of end states depends on a the end states only b particular adiabatic process c the value of index n d the value of heattransferred e mass of the system. Heat and work are a point functions b system properties c path functions d intensive properties e extensive properties. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure a enthalpy b volume c mass d entropy e specific volume.
Solids and liquids have a one value of specific heat ft two values of specific heat c three values of specific heat d no value of specific heat e one value under some conditions and two values under other conditions.
Curve A in Fig. The index of compression n tends to reach ratio of specific heats y when a flow is uniform and steady b process is isentropic c process is isothermal d process is isentropic and specific heat does not change with temperature e process is isentropic and specific heat changes with temperature. Change in enthalpy of a system is the heat supplied at a constant pressure b constant temperature c constant volume d constant entropy e N. The term N. A heat exchange process in which the product of pressure and volume remains constant is known as a heat exchange process b throttling process c isentropic process d adiabatic process e hyperbolic process.
Zeroth law of thermodynamics a deals with conversion of mass and energy b deals with reversibility and irreversibility of process c states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other d deals with heat engines e does not exist. Work done is zero for the following process a constant volume b free expansion c throttling d all Of the above e none of the above. For which of the following substances, the gas laws can be used with minimum error a dry steam b wet steam c saturated steam d superheated steam e steam at atmospheric pressure.
The work done will be about a xlOO5 joules b lxlO5 joules c 10 xlO5 joules d 10 xlO5 kilo joules e 10xl04kiojoules. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.
On volume basis, air contains following parts of oxygen a 21 b 23 c 25 d 77 e Universal gas constant is defined as equal to product of the molecular weight of the gas and a specific heat at constant pressure b specific heat at constant volume c ratio of two specific heats d gas constant e unity.
The value of the product of molecular weight and the gas characteristic constant for all the gases in S. For which of the following substances, the internal energy and enthalpy are the functions of temperature only a any gas b saturated steam c water d perfect gas e superheated steam. In a free expansion process a work done is zero b heat transfer is zero c both a and b above d work done is zero but heat increases e work done is zero but heat decreases.
If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as a free expansion b hyperbolic expansion c adiabatic expansion d parabolic expansion e throttling.
The specific heat of air increases with increase in a temperature b pressure c both pressure and temperature d variation of its constituents e air flow Answer: a. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called a free expansion b hyperbolic expansion c adiabatic expansion d parabolic expansion e throttling.
Which of the following processes is irreversible process a isothermal b adiabatic c throttling d all of the above e none of the above. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be a zero b minimum d maximum d infinity e there is no such criterion.
Minimum work in compressor is possible when the value of adiabatic index n is equal to a 0. A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process kJ heat left the gas and internal energy remained same. The more effective way of increasing efficiency of Carnot engine is to a increase higher temperature b decrease higher temperature c increase lower temperature d decrease lower temperature e keep lower temperature constant.
Entropy change depends on a heat transfer b mass transfer c change of temperature d thermodynamic state e change of pressure and volume. For reversible adiabatic process, change in entropy is a maximum b minimum c zero d unpredictable e negative. Isochoric process is one in which a free expansion takes place b very little mechanical work is done by the system c no mechanical work is done by the system d all parameters remain constant e mass and energy transfer do not take place.
According to first law of thermodynamics a work done by a system is equal to heat transferred by the system b total internal energy of a system during a process remains constant c internal energy, enthalpy and entropy during a process remain constant d total energy of a system remains constant e entropy of a system remains constant. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from a zeroth low of thermodynamic b first law of thermodynamics c second law to thermodynamics d basic law of thermodynamics e claussius statement.
First law of thermodynamics furnishes the relationship between a heat and work b heat, work and properties of the system c various properties of the system d various thermodynamic processes e heat and internal energy.
Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant a pressure b temperature c volume d internal energy e entropy. In an isothermal process, the internal energy a increases b decreases c remains constant d first increases and then decreases e first decreases and then increases.
Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant a pressure b temperature c volume d internal energy e entropy. According to first law of thermodynamics a mass and energy are mutually convertible b Carnot engine is most efficient c heat and work are mutually convertible d mass and light are mutually convertible e heat flows from hot substance to cold substance.
Total heat of a substance is also known as a internal energy b entropy c thermal capacity d enthalpy e thermal conductance. First law of thermodynamics a enables to determine change in internal energy of the system b does not help to predict whether the system will or not undergo a change c does not enable to determine change in entropy d provides relationship between heat, work and internal energy e all of the above.
Addition of heat at constant pressure to a gas results in a raising its temperature b raising its pressure c raising its volume d raising its temperature and doing external work e doing external work. Carnot cycle has maximum efficiency for a reversible engine b irreversible engine c new engine d petrol engine e diesel engine.
If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly a temperature b enthalpy c internal energy d entropy e all of the above. If a system after undergoing a series of processes, returns to the initial state then a process is thermodynamically in equilibrium b process is executed in closed system cycle c its entropy will change due to irreversibility d sum of heat and work transfer will be zero e no work will be done by the system.
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is a feasible b impossible c possible d possible, but with lot of sophistications e desirable.
A manufacturer claims to have a heat engine capable of developing 20 h. His claim is a justified b not possible c may be possible with lot of sophistications d cost will be very high e theroretically possible. In a Carnot cycle, heat is transferred at a constant pressure b constant volume c constant temperature d constant enthaply e any one of the above. A diathermic wall is one which a prevents thermal interaction b permits thermal interaction c encourages thermal interaction d discourages thermal interaction e does not exist.
An adiabatic wall is one which a prevents thermal interaction b permits thermal interaction c encourages thermal interaction d discourages thermal interaction e dos not exist. The door of a running refrigerator inside a room was left open. Which of the following statements is correct?
Water contained in a beaker can be made to boil by passing steam through it a at atmospheric pressure b at a pressure below the firuosphejric pressure c at a pressure greater than atmospheric pressure d any pressure e not possible. During throttling process a heat exchange does not take place b no work is done by expanding steam c there is no change of internal energy of steam d all of the above e entropy decreases.
The energy of molecular motion appears as a heat b potential energy c surface tension d friction e increase in pressure. A sudden fall in the barometer reading is a sign of approaching a fine weather b rains c storm d cold wave e hot wave. Calorie is a measure of a specific heat b quantity of heat c thermal capacity d entropy e work. Barometric pressure is equal to a mm Hg b zero mm Hg c The first law of thermodynamics is the law of a conservation of mass b conservation of energy c conservation of momentum d conservation of heat e conservation of temperature.
A perpetual motion machine is a a thermodynamic machine b a non-thermodynamic machine c a hypothetical machine d a hypothetical machine whose opera-tion would violate the laws of thermodynamics e an inefficient machine. Thermal power plant works on a Carnot cycle b Joule cycle d Rankine cycle d Otto cycle e Brayton cycle.
Which of the following is an irreversible cycle a carnot b Stirling c ericsson d all of the above e none of the above.
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