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Free download in PDF Thermodynamics Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(3)
The unit of length in S.I. units is
[A]
meter
[B]
centimeter
[C]
kilometer
[D]
millimeter
(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
(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
(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
(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
(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
(16)
Reversed joule cycle is called
[A]
Carnot cycle
[B]
Rankine cycle
[C]
Brayton cycle
[D]
Bell Coleman 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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