425 + Mcqs in Thermodynamics Page 8 McqOptions

351.	The efficiency of a dual combustion cycle __________ upon cut-off ratio.
A.	depends
B.	does not depend
C.	Can't say
D.	None of these
Answer» B. does not depend

Discussion

352.	The compression ratio is the ratio of
A.	swept volume to total volume
B.	total volume to swept volume
C.	swept volume to clearance volume
D.	total volume to clearance volume
Answer» E.

Discussion

353.	It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

354.	There is no change in internal energy in an isothermal process.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

355.	The heating of a gas at constant pressure is governed by Charles' law.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» B. False

Discussion

356.	The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.
A.	is equal to
B.	is not equal to
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

357.	The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.
A.	Agree
B.	Disagree
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

358.	The change of entropy, when heat is removed from the gas, is negative.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

359.	The change of entropy, when heat is removed from the gas, is positive.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

360.	Coal gas consists mainly of hydrogen, carbon monoxide and various hydrocarbons.
A.	Agree
B.	Disagree
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

361.	One Joule (J) is equal to
A.	1 N-m
B.	1 kN-m
C.	10 N-m/s
D.	10 kN-m/s
Answer» B. 1 kN-m

Discussion

362.	Hydrogen is the __________ substance.
A.	lightest
B.	heaviest
C.	Can't say
D.	None of these
Answer» B. heaviest

Discussion

363.	According to First law of thermodynamics,
A.	total internal energy of a system during a process remains constant
B.	total energy of a system remains constant
C.	workdone by a system is equal to the heat transferred by the system
D.	internal energy, enthalpy and entropy during a process remains constant
Answer» C. workdone by a system is equal to the heat transferred by the system

Discussion

364.	When the expansion or compression takes place according to the law pvn = C, the process is known as
A.	isothermal process
B.	adiabatic process
C.	hyperbolic process
D.	polytropic process
Answer» E.

Discussion

365.	Otto cycle is also known as
A.	constant pressure cycle
B.	constant volume cycle
C.	constant temperature cycle
D.	constant temperature and pressure cycle
Answer» C. constant temperature cycle

Discussion

366.	A good fuel should have __________ ignition point.
A.	high
B.	low
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

367.	Which of the following gas has a minimum molecular mass?
A.	Oxygen
B.	Nitrogen
C.	Hydrogen
D.	Methane
Answer» D. Methane

Discussion

368.	The hyperbolic pocess is governed by
A.	Boyle's law
B.	Charles' law
C.	Gay-Lussac law
D.	Avogadro's law
Answer» B. Charles' law

Discussion

369.	According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
A.	first kind
B.	second kind
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

370.	A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
A.	cracking
B.	carbonisation
C.	fractional distillation
D.	full distillation
Answer» B. carbonisation

Discussion

371.	The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A.	cracking
B.	carbonisation
C.	fractional distillation
D.	full distillation
Answer» D. full distillation

Discussion

372.	Which is the incorrect statement about Carnot cycle?
A.	It is used as the alternate standard of comparison of all heat engines.
B.	All the heat engines are based on Carnot cycle.
C.	It provides concept of maximising work output between the two temperature limits.
D.	all of the above
Answer» C. It provides concept of maximising work output between the two temperature limits.

Discussion

373.	When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
A.	Zeroth law of thermodynamics
B.	First law of thermodynamics
C.	Second law of thermodynamics
D.	Kelvin Planck's law
Answer» B. First law of thermodynamics

Discussion

374.	The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
A.	workdone
B.	entropy
C.	enthalpy
D.	none of these
Answer» D. none of these

Discussion

375.	The value of 1 mm of Hg is equal to
A.	1.333 N/m²
B.	13.33 N/m²
C.	133.3 N/m²
D.	1333 N/m²
Answer» D. 1333 N/m²

Discussion

376.	One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
A.	8/3
B.	11/3
C.	11/7
D.	7/3
Answer» E.

Discussion

377.	The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
A.	Boyle's law
B.	Charles' law
C.	Gay-Lussac law
D.	all of these
Answer» E.

Discussion

378.	The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

379.	An isothermal process is governed by
A.	Boyles law
B.	Charles law
C.	Gay-Lussac law
D.	Avogadros law
Answer» B. Charles law

Discussion

380.	A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as
A.	reversible cycle
B.	irreversible cycle
C.	thermodynamic cycle
D.	none of these
Answer» D. none of these

Discussion

381.	When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
A.	zero
B.	1/5
C.	4/5
D.	1
Answer» B. 1/5

Discussion

382.	Stirling and Ericsson cycles are
A.	reversible cycles
B.	irreversible cycles
C.	semi-reversible cycles
D.	quasi-static cycles
Answer» B. irreversible cycles

Discussion

383.	The constant pressure, constant volume and constant pvn processes are regarded as irreversible process.
A.	True
B.	False
Answer» B. False

Discussion

384.	The specific heat of water is
A.	1.817
B.	2512
C.	4.187
D.	none of these
Answer» D. none of these

Discussion

385.	The absolute zero temperature is taken as
A.	-273°C
B.	273°C
C.	237°F
D.	-237°F
Answer» B. 273°C

Discussion

386.	One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A.	All
B.	4/7
C.	11/4
D.	9/7
Answer» C. 11/4

Discussion

387.	The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

388.	According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.
A.	equal to
B.	directly proportional to
C.	inversely proportional to
Answer» C. inversely proportional to

Discussion

389.	Coal gas is obtained by mixing coal and gas at ambient conditions.
A.	Yes
B.	No
Answer» C.

Discussion

390.	The efficiency of Diesel cycle increases with
A.	decrease in cut-off
B.	increase in cut-off
C.	constant cut-off
D.	none of these
Answer» B. increase in cut-off

Discussion

391.	In the first law of thermodynamics, the total energy of the system remains constant.
A.	True
B.	False
Answer» B. False

Discussion

392.	The value of gas constant (R) in S. I. units is
A.	0.287 J/kgK
B.	2.87 J/kgK
C.	28.7 J/kgK
D.	287 J/kgK
Answer» E.

Discussion

393.	Which of the following gas is mostly used in town for street and domestic lighting and heating?
A.	Producer gas
B.	Coal gas
C.	Mond gas
D.	Coke oven gas
Answer» C. Mond gas

Discussion

394.	Which of the following statement is incorrect?
A.	The liquid fuels consist of hydrocarbons.
B.	The liquid fuels have higher calorific value than solid fuels.
C.	The solid fuels have higher calorific value than liquid fuels.
D.	A good fuel should have low ignition point.
Answer» D. A good fuel should have low ignition point.

Discussion

395.	The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A.	cracking
B.	carbonisation
C.	fractional distillation
D.	full distillation
Answer» D. full distillation

Discussion

396.	Which of the following is correct?
A.	Absolute pressure = Gauge pressure + Atmospheric pressure
B.	Gauge pressure = Absolute pressure + Atmospheric pressure
C.	Atmospheric pressure = Absolute pressure + Gauge pressure
D.	Absolute pressure = Gauge pressure - Atmospheric pressure
Answer» B. Gauge pressure = Absolute pressure + Atmospheric pressure

Discussion

397.	When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
A.	atomisation
B.	carbonisation
Answer» C.

Discussion

398.	The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
A.	less than
B.	equal to
C.	more than
Answer» D.

Discussion

399.	If the value of n = 0 in the equation pvn = C, then the process is called
A.	constant volume process
B.	adiabatic process
C.	constant pressure process
D.	isothermal process
Answer» D. isothermal process

Discussion

400.	There is no change in internal energy in an isothermal process.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

Explore topic-wise MCQs in Graduate Aptitude Test (GATE).

The efficiency of a dual combustion cycle __________ upon cut-off ratio.

The compression ratio is the ratio of

It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.

There is no change in internal energy in an isothermal process.

The heating of a gas at constant pressure is governed by Charles' law.

The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.

The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

The change of entropy, when heat is removed from the gas, is negative.

The change of entropy, when heat is removed from the gas, is positive.

Coal gas consists mainly of hydrogen, carbon monoxide and various hydrocarbons.

One Joule (J) is equal to

Hydrogen is the __________ substance.

According to First law of thermodynamics,

When the expansion or compression takes place according to the law pvn = C, the process is known as

Otto cycle is also known as

A good fuel should have __________ ignition point.

Which of the following gas has a minimum molecular mass?

The hyperbolic pocess is governed by

According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.

A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

Which is the incorrect statement about Carnot cycle?

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

The value of 1 mm of Hg is equal to

One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant.

&nbsp; An&nbsp;isothermal&nbsp;process&nbsp;is&nbsp;governed&nbsp;by

A&nbsp;series&nbsp;of&nbsp;operations,&nbsp;which&nbsp;takes&nbsp;place&nbsp;in&nbsp;a&nbsp;certain&nbsp;order&nbsp;and&nbsp;restore&nbsp;the&nbsp;initial&nbsp;conditions&nbsp;at&nbsp;the&nbsp;end,&nbsp;is&nbsp;known&nbsp;as

When&nbsp;cut-off&nbsp;ratio&nbsp;is&nbsp;__________&nbsp;the&nbsp;efficiency&nbsp;of&nbsp;Diesel&nbsp;cycle&nbsp;approaches&nbsp;to&nbsp;Otto&nbsp;cycle&nbsp;efficiency.

Stirling&nbsp;and&nbsp;Ericsson&nbsp;cycles&nbsp;are

The&nbsp;constant&nbsp;pressure,&nbsp;constant&nbsp;volume&nbsp;and&nbsp;constant&nbsp;pvn&nbsp;processes&nbsp;are&nbsp;regarded&nbsp;as&nbsp;irreversible&nbsp;process.

The&nbsp;specific&nbsp;heat&nbsp;of&nbsp;water&nbsp;is

The&nbsp;absolute&nbsp;zero&nbsp;temperature&nbsp;is&nbsp;taken&nbsp;as

One&nbsp;kg&nbsp;of&nbsp;carbon&nbsp;monoxide&nbsp;requires&nbsp;__________&nbsp;kg&nbsp;of&nbsp;oxygen&nbsp;to&nbsp;produce&nbsp;11/7&nbsp;kg&nbsp;of&nbsp;carbon&nbsp;dioxide&nbsp;gas.

The&nbsp;kinetic&nbsp;energy&nbsp;of&nbsp;molecules&nbsp;of&nbsp;a&nbsp;gas&nbsp;becomes&nbsp;zero&nbsp;at&nbsp;absolute&nbsp;zero&nbsp;temperature.

According&nbsp;to&nbsp;Avogadro&#39;s&nbsp;law,&nbsp;the&nbsp;density&nbsp;of&nbsp;any&nbsp;two&nbsp;gases&nbsp;is&nbsp;__________&nbsp;their&nbsp;molecular&nbsp;masses,&nbsp;if&nbsp;the&nbsp;gases&nbsp;are&nbsp;at&nbsp;the&nbsp;same&nbsp;temperature&nbsp;and&nbsp;pressure.

Coal&nbsp;gas&nbsp;is&nbsp;obtained&nbsp;by&nbsp;mixing&nbsp;coal&nbsp;and&nbsp;gas&nbsp;at&nbsp;ambient&nbsp;conditions.

The&nbsp;efficiency&nbsp;of&nbsp;Diesel&nbsp;cycle&nbsp;increases&nbsp;with

&nbsp; In&nbsp;the&nbsp;first&nbsp;law&nbsp;of&nbsp;thermodynamics,&nbsp;the&nbsp;total&nbsp;energy&nbsp;of&nbsp;the&nbsp;system&nbsp;remains&nbsp;constant.

The&nbsp;value&nbsp;of&nbsp;gas&nbsp;constant&nbsp;(R)&nbsp;in&nbsp;S.&nbsp;I.&nbsp;units&nbsp;is

Which&nbsp;of&nbsp;the&nbsp;following&nbsp;gas&nbsp;is&nbsp;mostly&nbsp;used&nbsp;in&nbsp;town&nbsp;for&nbsp;street&nbsp;and&nbsp;domestic&nbsp;lighting&nbsp;and&nbsp;heating?

Which&nbsp;of&nbsp;the&nbsp;following&nbsp;statement&nbsp;is&nbsp;incorrect?

Which&nbsp;of&nbsp;the&nbsp;following&nbsp;is&nbsp;correct?

When&nbsp;coal&nbsp;is&nbsp;strongly&nbsp;heated&nbsp;continuously&nbsp;for&nbsp;42&nbsp;to&nbsp;48&nbsp;hours&nbsp;in&nbsp;the&nbsp;absence&nbsp;of&nbsp;air&nbsp;in&nbsp;a&nbsp;closed&nbsp;vessel,&nbsp;the&nbsp;process&nbsp;is&nbsp;known&nbsp;as&nbsp;__________&nbsp;of&nbsp;fuel.

The&nbsp;value&nbsp;of&nbsp;specific&nbsp;heat&nbsp;at&nbsp;constant&nbsp;pressure&nbsp;(cp)&nbsp;is&nbsp;__________&nbsp;that&nbsp;of&nbsp;at&nbsp;constant&nbsp;volume&nbsp;(cv).

If&nbsp;the&nbsp;value&nbsp;of&nbsp;n&nbsp;=&nbsp;0&nbsp;in&nbsp;the&nbsp;equation&nbsp;pvn&nbsp;=&nbsp;C,&nbsp;then&nbsp;the&nbsp;process&nbsp;is&nbsp;called

There&nbsp;is&nbsp;no&nbsp;change&nbsp;in&nbsp;internal&nbsp;energy&nbsp;in&nbsp;an&nbsp;isothermal&nbsp;process.

An isothermal process is governed by

A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

Stirling and Ericsson cycles are

The constant pressure, constant volume and constant pvn processes are regarded as irreversible process.

The specific heat of water is

The absolute zero temperature is taken as

One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.

According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.

Coal gas is obtained by mixing coal and gas at ambient conditions.

The efficiency of Diesel cycle increases with

In the first law of thermodynamics, the total energy of the system remains constant.

The value of gas constant (R) in S. I. units is

Which of the following gas is mostly used in town for street and domestic lighting and heating?

Which of the following statement is incorrect?

Which of the following is correct?

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.

The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

If the value of n = 0 in the equation pvn = C, then the process is called

There is no change in internal energy in an isothermal process.