320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
- AEqual to one
- BLess than one
- CGreater than one
- DNone of these
2.Otto cycle consists of following four processes
- ATwo isothermal and two isentropic
- BTwo isentropic and two constant volumes
- CTwo isentropic, one constant volume and one constant pressure
- DTwo isentropic and two constant pressures
3.The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)
- AQ1 - 2 = dU + W1 – 2
- BQ1 - 2 = dU - W1 – 2
- CQ1 - 2 = dU/W1 – 2
- DQ1 - 2 = dU × W1 – 2
4.The value of n = 1 in the polytropic process indicates it to be
- AReversible process
- BIsothermal process
- CAdiabatic process
- DIrreversible process
5.First law of thermodynamics deals with
- AConservation of heat
- BConservation of momentum
- CConservation of mass
- DConservation of energy
6.The term N.T.P. stands for
- ANominal temperature and pressure
- BNatural temperature and pressure
- CNormal temperature and pressure
- DNormal thermodynamic practice
7.Which of the following laws is applicable for the behaviour of a perfect gas?
- ABoyle's law
- BCharles ‘law
- CGay Lussac’s law
- DAll of the above
8.Which of the following variables controls the physical properties of a perfect gas?
- APressure
- BTemperature
- CVolume
- DAll of the above
9.Second law of thermodynamics defines
- AHeat
- BWork
- CInternal energy
- DEntropy
10.In an irreversible process, there is a
- ANo loss of heat
- BLoss of heat
- CGain of heat
- DNo gain of heat
11.If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as
- AFree expansion
- BHyperbolic expansion
- CAdiabatic expansion
- DThrottling
12.One kilowatt is equal to
- A1 N-m/s
- B100 N-m
- C1000 N-m/s
- D1 × 106 N-m/s
13.In an isothermal process,
- AThere is no change in temperature
- BThere is no change in enthalpy
- CThere is no change in internal energy
- DAll of these
14.Zeroth law of thermodynamics
- ADeals with conversion of mass and energy
- BDeals with reversibility and irreversibility of process
- CStates that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
- DDeals with heat engines
15.The efficiency of Joule cycle is
- ALess than Carnot cycle
- BEqual to Carnot cycle
- CGreater than Carnot cycle
- DNone of these
16.The value of 1 mm of Hg is equal to
- A1.333 N/m2
- B13.33 N/m2
- C133.3 N/m2
- D1333 N/m2
17.Which of the following process can be made reversible with the help of a regenerator?
- AConstant pressure process
- BConstant volume process
- CConstant pvn process
- DAll of these
18.The work ratio of a gas turbine plant is given by
- A(Net work output)/(Work-done by the turbine)
- B(Net work output)/(Heat supplied)
- C(Actual temperature drop)/(Isentropic temperature drop)
- D(Isentropic increase in temperature)/(Actual increase in temperature)
19.The efficiency of a gas turbine is given by
- A(Net work output)/(Work-done by the turbine)
- B(Net work output)/(Heat supplied)
- C(Actual temperature drop)/(Isentropic temperature drop)
- D(Isentropic increase in temperature)/(Actual increase in temperature)
20.A definite area or a space where some thermodynamic process takes place is known as
- AThermodynamic system
- BThermodynamic cycle
- CThermodynamic process
- DThermodynamic law