Thermodynamics MCQs | Thermodynamics Multiple Choice Questions and Answers

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Questions
1 Which of the following variables controls the physical properties of a perfect gas
A pressure
B temperature
C volume
D all of the above

Answer: all of the above
2 Which of the following laws is applicable for the behavior of a perfect gas
A Boyle’s law
B Charles’law
C Gay-Lussac law
D all of the above

Answer: all of the above
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3 The unit of length in S.I. units is
A meter
B centimeter
C kilometer
D millimeter

Answer: meter
4 According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as
A temperature
B absolute
C absolute temperature, if volume is kept constant
D volume, if temperature is kept constant

Answer: absolute temperature, if volume is kept constant
5 According to Dalton’s law, the total pres sure of the mixture of gases is equal to
A greater of the partial pressures of all
B average of the partial pressures of all
C sum of the partial pressures of all
D sum of the partial pressures of all divided by average molecular weight

Answer: sum of the partial pressures of all
6 Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits.
A 02, N2, steam, C02
B Oz, N2, water vapour
C S02, NH3, C02, moisture
D 02, N2, H2, air

Answer: 02, N2, H2, air
7 A closed system is one in which
A mass does not cross boundaries of the system, though energy may do so
B mass crosses the boundary but not the energy
C neither mass nor energy crosses the boundaries of the system
D both energy and mass cross the boundaries of the system

Answer: mass does not cross boundaries of the system, though energy may do so
8 Diesel cycle consists of following four processes
A two isothermals and two isentropics
B two isentropics, and two constant volumes
C two isentropics, one constant volume and one constant pressure
D two isentropics and two constant pressures

Answer: two isentropics, one constant volume and one constant pressure
9 A cycle consisting of two adiabatics and two constant pressure processes is known as
A Otto cycle
B Ericsson cycle
C Joule cycle
D Stirling cycle

Answer: Joule cycle
10 Brayton cycle consists’ of following four processes
A two isothermals and two isentropics
B two isentropics and two constant volumes
C two isentropics, one constant volume and one constant pressure
D two isentropics and two constant pres-sures

Answer: two isentropics and two constant pres-sures
11 The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
A Dual combustion cycle
B Diesel cycle
C Atkinson cycle
D Rankine cycle

Answer: Atkinson cycle
12 The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will
A increase
B decrease
C remain unchanged
D increase/decrease depending on application

Answer: increase
13 The following cycle is used for air craft refrigeration
A Brayton cycle
B Joule cycle
C Carnot cycle
D Reversed-Brayton cycle

Answer: Reversed-Brayton cycle
14 Gas turbine cycle consists of
A two isothermals and two isentropics
B two isentropics and two constant volumes
C two isentropics, one constant volume and one constant pressure
D two isentropics and two constant pressures

Answer: two isentropics and two constant pressures
15 Which of the following cycles has maximum efficiency
A Rankine
B Stirling
C Carnot
D Brayton

Answer: Carnot
16 Reversed joule cycle is called
A Carnot cycle
B Rankine cycle
C Brayton cycle
D Bell Coleman cycle

Answer: Brayton cycle
17 For same compression ratio and for same heat added
A Otto cycle is more efficient than Diesel cycle
B Diesel cycle is more efficient than Otto cycle
C efficiency depends on other factors
D both Otto and Diesel cycles are equally efficient

Answer: Otto cycle is more efficient than Diesel cycle
18 Otto cycle consists of following four processes
A two isothermals and two isentropics
B two isentropics and two constant volumes
C two isentropics, one constant volume and one constant pressure
D two isentropics and two constant pres-sures

Answer: two isentropics and two constant volumes
19 Kelvin Planck’s law deals with
A conservation of heat
B conservation of work
C conversion of heat into work
D conversion fo work into heat

Answer: conversion of heat into work
20 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

Answer: conservation of energy
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