133 + Interview Questions in Energy Balances in Chemical Process Calculation Page 3 InterviewSolution

101.	Unsteady state is also known as Transient state, the statement is(a) True(b) False(c) Applicable for some systems(d) None of the mentionedI have been asked this question in an online quiz.The query is from Energy Balances topic in chapter Energy Balances of Chemical Process Calculation
Answer» Right option is (a) True For EXPLANATION: UNSTEADY state is also KNOWN as TRANSIENT state.

Discussion

102.	A property is dependent on mass of the material is(a) Extensive property(b) Intensive property(c) Neither Intensive nor Extensive(d) None of the mentionedI have been asked this question in my homework.This question is from Energy Balances topic in portion Energy Balances of Chemical Process Calculation
Answer» Right choice is (a) EXTENSIVE PROPERTY Best EXPLANATION: A property is dependent on mass of the material is Extensive property.

Discussion

103.	Heat is negative when transferred to the _____________(a) System(b) Surrounding(c) Boundary(d) None of the mentionedThe question was posed to me in a national level competition.This interesting question is from Energy Balances topic in portion Energy Balances of Chemical Process Calculation
Answer» CORRECT CHOICE is (a) System The best EXPLANATION: Heat is NEGATIVE when TRANSFERRED to the surrounding .

Discussion

104.	Which one is a state variable ?(a) Internal Energy(b) Enthalpy(c) Entropy(d) All of the mentionedThis question was addressed to me in an interview for job.My question comes from Energy Balances topic in portion Energy Balances of Chemical Process Calculation
Answer» Correct answer is (d) All of the mentioned The BEST I can explain: All a, B, C are STATE variables as these are only depended only on the state, not on the HISTORY.

Discussion

105.	A non-flow system is also known as(a) Open System(b) Closed System(c) Bounded System(d) None of the mentionedI have been asked this question during an interview.I'd like to ask this question from Energy Balances in section Energy Balances of Chemical Process Calculation
Answer» Correct option is (b) Closed SYSTEM For EXPLANATION I would SAY: A non-flow system is also known as Closed system.

Discussion

106.	A boundary may be movable. The statement is(a) True(b) False(c) Imaginary(d) None of the mentionedI have been asked this question at a job interview.I'm obligated to ask this question of Energy Balances topic in section Energy Balances of Chemical Process Calculation
Answer» The CORRECT choice is (a) True To EXPLAIN I would SAY: A BOUNDARY may be movable and rigid as WELL.

Discussion

107.	Standard heats of formation are _________ for endothermic reaction.(a) Negative(b) Positive(c) Zero(d) None of the mentionedThe question was asked in a job interview.My question is from Energy Balances for a Chemical Reaction in portion Energy Balances of Chemical Process Calculation
Answer»

Discussion

108.	Internal energy is the function of(a) Temperature and Pressure(b) Temperature and Volume(c) Pressure and Volume(d) None of the mentionedI got this question in semester exam.I need to ask this question from Internal Energy in section Energy Balances of Chemical Process Calculation
Answer» The correct option is (B) Temperature and Volume For explanation I WOULD SAY: U = f(T,V).

Discussion

109.	Work is negative when ________ performs a work on the ____________________(a) System, Surrounding(b) Surrounding, System(c) System, System(d) Surrounding, SurroundingThis question was addressed to me in an interview for job.Origin of the question is Energy Balances in portion Energy Balances of Chemical Process Calculation
Answer» Correct option is (a) System, SURROUNDING The BEST EXPLANATION: Work is negative when System performs a work on the surrounding.

Discussion

110.	Work is a ______________ variable.(a) Path(b) State(c) Neither Path nor State(d) None of the mentionedI got this question during an internship interview.This interesting question is from Energy Balances in portion Energy Balances of Chemical Process Calculation
Answer» The correct choice is (a) PATH For explanation I would SAY: WORK is a Path VARIABLE.

Discussion

111.	When Heat is gained by the system(a) Q < 0(b) Q > 0(c) Q = 0(d) None of the mentionedThis question was addressed to me in an online interview.Asked question is from Energy Balances in section Energy Balances of Chemical Process Calculation
Answer» Right CHOICE is (b) Q > 0 To explain: HEAT TRANSFERRED from the surrounding, T2-T1> 0 so Q > 0.

Discussion

112.	The surface that separates a system from the surrounding is called(a) Boundary(b) Surface(c) Surrounding(d) None of the mentionedThe question was posed to me at a job interview.I'd like to ask this question from Energy Balances in division Energy Balances of Chemical Process Calculation
Answer» CORRECT ANSWER is (a) BOUNDARY Easiest explanation: The SURFACE that separates a system from the surrounding is called Boundary.

Discussion

113.	The heat of formation as ______ in the standard state for each stable element.(a) Zero(b) Cannot be calculated(c) Negative(d) positiveI had been asked this question during a job interview.My question is from Energy Balances for a Chemical Reaction topic in chapter Energy Balances of Chemical Process Calculation
Answer» RIGHT answer is (a) ZERO Easiest explanation: The heat of formation as Zero in the STANDARD state for each STABLE element.

Discussion

114.	Temperature for standard heat of formation is(a) 298 K(b) 300 K(c) 400 K(d) 528 KThe question was asked during an internship interview.Asked question is from Energy Balances for a Chemical Reaction topic in section Energy Balances of Chemical Process Calculation
Answer» RIGHT CHOICE is (a) 298 K The EXPLANATION is: STANDARD temperature = 25 degree Celsius = 25+273 = 298 K.

Discussion

115.	For a diatomic gas, Cv is(a) 1.5 R(b) 2.5 R(c) 3.5 R(d) 4.5 RThe question was asked during an online interview.My question is taken from Heat Capacity topic in chapter Energy Balances of Chemical Process Calculation
Answer» RIGHT answer is (B) 2.5 R Explanation: For a DIATOMIC gas Cv = 2.5 R.

Discussion

116.	The enthalpy change for the phase transition of a liquid to a vapour is(a) Heat of Condensation(b) Heat of vaporization(c) Heat of solidification(d) Heat of sublimationThis question was addressed to me in examination.My doubt stems from Enthalpy in section Energy Balances of Chemical Process Calculation
Answer» Right answer is (b) Heat of VAPORIZATION Best EXPLANATION: The enthalpy change for the phase transition of a liquid to a VAPOUR is CALLED Heat of vaporization.

Discussion

117.	What is the Enthalpy change for a 20 Kg mole Nitrogen gas that is heated from 100 K to 200 K at constant pressure. (Cv = 2000 J/(Kgmole)(Degree Celsius))(a) 210^6(b) 410^6(c) 610^6(d) 810^6I had been asked this question in semester exam.Origin of the question is Enthalpy topic in division Energy Balances of Chemical Process Calculation
Answer» The correct OPTION is (d) 8*10^6 To explain I would say: H2 – H1 = nCp(T2-T1).

Discussion

118.	Specific enthalpy is the function of(a) Temperature and Pressure(b) Temperature and Volume(c) Pressure and Volume(d) None of the mentionedThe question was posed to me during an online exam.My doubt is from Enthalpy in portion Energy Balances of Chemical Process Calculation
Answer» CORRECT answer is (a) TEMPERATURE and Pressure The explanation: H = F(T, P).

Discussion

119.	A system is at rest, the kinetic energy of the system is(a) Infinite(b) Greater than zero(c) Less than zero(d) ZeroI have been asked this question in a national level competition.My doubt is from Kinetic and Potential Energy topic in portion Energy Balances of Chemical Process Calculation
Answer» The CORRECT choice is (a) Infinite Best EXPLANATION: A resting body have no VELOCITY and kinetic ENERGY.

Discussion

120.	Which one is not a type of work?(a) Mechanical work(b) Electrical work(c) Shaft work(d) All of the mentionedThis question was posed to me in examination.This interesting question is from Energy Balances in division Energy Balances of Chemical Process Calculation
Answer» The correct option is (d) All of the mentioned The BEST explanation: Mechanical, Electrical and SHAFT are kind of work.

Discussion

121.	Sate of a system is specified by(a) Temperature(b) Pressure(c) Volume(d) All of the mentionedI have been asked this question during an interview for a job.My question is based upon Energy Balances in section Energy Balances of Chemical Process Calculation
Answer» The CORRECT OPTION is (d) All of the mentioned To explain I would SAY: Ate of a system is specified by T, P, V etc.

Discussion

122.	A part of a system that is physically distinct and macroscopically homogeneous of fixed or variable composition is known as(a) Concentration(b) State(c) Phase(d) None of the mentionedI got this question in an interview for job.This interesting question is from Energy Balances topic in section Energy Balances of Chemical Process Calculation
Answer» The correct answer is (c) Phase To explain I would SAY: A PART of a system that is PHYSICALLY distinct and macroscopically homogeneous of fixed or VARIABLE composition is known as phase.

Discussion

123.	The properties of a system are invariant in a state, called(a) Transition state(b) Steady state(c) Unsteady state(d) None of the mentionedThis question was posed to me during an interview.I'd like to ask this question from Energy Balances topic in portion Energy Balances of Chemical Process Calculation
Answer» The CORRECT CHOICE is (b) STEADY STATE Easiest EXPLANATION: The properties of a system are invariant in a state, that is called Steady state.

Discussion

124.	Rusting of Fe is(a) Exothermic(b) Endothermic(c) No heat transfer(d) None of the mentionedThis question was posed to me during an interview.My question is taken from Energy Balances for a Chemical Reaction in section Energy Balances of Chemical Process Calculation
Answer» Correct OPTION is (a) EXOTHERMIC The BEST I can EXPLAIN: COMBUSTION is an Exothermic Reaction as heat is released.

Discussion

125.	A reaction for which heat must be removed from the system to maintain isothermal condition is called(a) Endothermic Reaction(b) Exothermic Reaction(c) Neutral Reaction(d) None of the mentionedI have been asked this question in homework.Question is from Energy Balances for a Chemical Reaction topic in section Energy Balances of Chemical Process Calculation
Answer» Correct answer is (B) Exothermic Reaction To EXPLAIN I would SAY: A reaction for which heat must be removed from the system to MAINTAIN isothermal CONDITION is called Exothermic Reaction.

Discussion

126.	What is T2?(a) T, melting(b) T, freezing(c) T, vaporization(d) T, condensationThe question was posed to me in an interview.Question is taken from Enthalpy in chapter Energy Balances of Chemical Process Calculation
Answer» RIGHT choice is (c) T, vaporization Explanation: T2 is the vaporization TEMPERATURE.

Discussion

127.	For ideal gases, the heat capacity relation is(a) Cp = Cv – R(b) Cv = Cp + R(c) Cp – Cv = R(d) None of the mentionedThis question was addressed to me in unit test.The question is from Enthalpy in division Energy Balances of Chemical Process Calculation
Answer» Right option is (c) CP – CV = R Easiest explanation: Cp – Cv = R.

Discussion

128.	Energy a system possesses because of the force exerted on its mass by a gravitational or electromagnetic field with respect to a reference surface.(a) Kinetic Energy(b) Potential Energy(c) Work(d) None of the mentionedI had been asked this question in an online quiz.Question is from Kinetic and Potential Energy topic in section Energy Balances of Chemical Process Calculation
Answer» RIGHT answer is (B) Potential Energy For EXPLANATION: Potential energy is the Energy a SYSTEM possesses because of the force exerted on its mass by a gravitational or electromagnetic field with respect to a reference SURFACE.

Discussion

129.	Work ______ be stored.(a) Can(b) Can not(c) always can(d) None of the mentionedThe question was asked by my college director while I was bunking the class.My doubt stems from Energy Balances in chapter Energy Balances of Chemical Process Calculation
Answer» The CORRECT answer is (b) Can not The best I can EXPLAIN: WORK cannot be STORED.

Discussion

130.	A cold body contains no heat. The statement is(a) Correct(b) Incorrect(c) Always correct(d) None of the mentionedI have been asked this question in semester exam.I need to ask this question from Energy Balances topic in section Energy Balances of Chemical Process Calculation
Answer» CORRECT choice is (b) Incorrect To explain I WOULD SAY: Heat can be CONTAINED by a cold BODY.

Discussion

131.	A ___________ is any variable whose value depends on how the process takes place.(a) Path variable(b) State variable(c) Neither Path nor State variable(d) None of the mentionedThis question was addressed to me in quiz.This is a very interesting question from Energy Balances topic in section Energy Balances of Chemical Process Calculation
Answer» Correct answer is (a) Path VARIABLE The best explanation: A Path variable is any variable WHOSE VALUE depends on how the process takes place.

Discussion

132.	Q = 45 means(a) Heat is transferred from the system(b) Heat is transferred from surrounding(c) Heat is gained by the surrounding(d) None of the mentionedThe question was asked in semester exam.My enquiry is from Energy Balances in chapter Energy Balances of Chemical Process Calculation
Answer» Correct choice is (b) HEAT is transferred from surrounding For EXPLANATION: Q > 0,Heat is GAINED by the SYSTEM and transferred from the surrounding.

Discussion

133.	Which one is an example of a property?(a) Pressure(b) Temperature(c) Volume(d) All of the mentionedThis question was addressed to me in a national level competition.My doubt stems from Energy Balances topic in chapter Energy Balances of Chemical Process Calculation
Answer» CORRECT OPTION is (d) All of the mentioned To EXPLAIN I would say: Temperature, PRESSURE and Volume. are the observable characteristic of a SYSTEM.

Discussion

Explore topic-wise InterviewSolutions in .

Unsteady state is also known as Transient state, the statement is(a) True(b) False(c) Applicable for some systems(d) None of the mentionedI have been asked this question in an online quiz.The query is from Energy Balances topic in chapter Energy Balances of Chemical Process Calculation

Heat is negative when transferred to the _____________(a) System(b) Surrounding(c) Boundary(d) None of the mentionedThe question was posed to me in a national level competition.This interesting question is from Energy Balances topic in portion Energy Balances of Chemical Process Calculation

Which one is a state variable ?(a) Internal Energy(b) Enthalpy(c) Entropy(d) All of the mentionedThis question was addressed to me in an interview for job.My question comes from Energy Balances topic in portion Energy Balances of Chemical Process Calculation

A non-flow system is also known as(a) Open System(b) Closed System(c) Bounded System(d) None of the mentionedI have been asked this question during an interview.I'd like to ask this question from Energy Balances in section Energy Balances of Chemical Process Calculation

A boundary may be movable. The statement is(a) True(b) False(c) Imaginary(d) None of the mentionedI have been asked this question at a job interview.I'm obligated to ask this question of Energy Balances topic in section Energy Balances of Chemical Process Calculation

Standard heats of formation are _________ for endothermic reaction.(a) Negative(b) Positive(c) Zero(d) None of the mentionedThe question was asked in a job interview.My question is from Energy Balances for a Chemical Reaction in portion Energy Balances of Chemical Process Calculation

Internal energy is the function of(a) Temperature and Pressure(b) Temperature and Volume(c) Pressure and Volume(d) None of the mentionedI got this question in semester exam.I need to ask this question from Internal Energy in section Energy Balances of Chemical Process Calculation

Work is a ______________ variable.(a) Path(b) State(c) Neither Path nor State(d) None of the mentionedI got this question during an internship interview.This interesting question is from Energy Balances in portion Energy Balances of Chemical Process Calculation

When Heat is gained by the system(a) Q < 0(b) Q > 0(c) Q = 0(d) None of the mentionedThis question was addressed to me in an online interview.Asked question is from Energy Balances in section Energy Balances of Chemical Process Calculation

The surface that separates a system from the surrounding is called(a) Boundary(b) Surface(c) Surrounding(d) None of the mentionedThe question was posed to me at a job interview.I'd like to ask this question from Energy Balances in division Energy Balances of Chemical Process Calculation

Temperature for standard heat of formation is(a) 298 K(b) 300 K(c) 400 K(d) 528 KThe question was asked during an internship interview.Asked question is from Energy Balances for a Chemical Reaction topic in section Energy Balances of Chemical Process Calculation

For a diatomic gas, Cv is(a) 1.5 R(b) 2.5 R(c) 3.5 R(d) 4.5 RThe question was asked during an online interview.My question is taken from Heat Capacity topic in chapter Energy Balances of Chemical Process Calculation

Specific enthalpy is the function of(a) Temperature and Pressure(b) Temperature and Volume(c) Pressure and Volume(d) None of the mentionedThe question was posed to me during an online exam.My doubt is from Enthalpy in portion Energy Balances of Chemical Process Calculation

A system is at rest, the kinetic energy of the system is(a) Infinite(b) Greater than zero(c) Less than zero(d) ZeroI have been asked this question in a national level competition.My doubt is from Kinetic and Potential Energy topic in portion Energy Balances of Chemical Process Calculation

Which one is not a type of work?(a) Mechanical work(b) Electrical work(c) Shaft work(d) All of the mentionedThis question was posed to me in examination.This interesting question is from Energy Balances in division Energy Balances of Chemical Process Calculation

Sate of a system is specified by(a) Temperature(b) Pressure(c) Volume(d) All of the mentionedI have been asked this question during an interview for a job.My question is based upon Energy Balances in section Energy Balances of Chemical Process Calculation

Rusting of Fe is(a) Exothermic(b) Endothermic(c) No heat transfer(d) None of the mentionedThis question was posed to me during an interview.My question is taken from Energy Balances for a Chemical Reaction in section Energy Balances of Chemical Process Calculation

What is T2?(a) T, melting(b) T, freezing(c) T, vaporization(d) T, condensationThe question was posed to me in an interview.Question is taken from Enthalpy in chapter Energy Balances of Chemical Process Calculation

For ideal gases, the heat capacity relation is(a) Cp = Cv – R(b) Cv = Cp + R(c) Cp – Cv = R(d) None of the mentionedThis question was addressed to me in unit test.The question is from Enthalpy in division Energy Balances of Chemical Process Calculation

Work ______ be stored.(a) Can(b) Can not(c) always can(d) None of the mentionedThe question was asked by my college director while I was bunking the class.My doubt stems from Energy Balances in chapter Energy Balances of Chemical Process Calculation

A cold body contains no heat. The statement is(a) Correct(b) Incorrect(c) Always correct(d) None of the mentionedI have been asked this question in semester exam.I need to ask this question from Energy Balances topic in section Energy Balances of Chemical Process Calculation

Q = 45 means(a) Heat is transferred from the system(b) Heat is transferred from surrounding(c) Heat is gained by the surrounding(d) None of the mentionedThe question was asked in semester exam.My enquiry is from Energy Balances in chapter Energy Balances of Chemical Process Calculation

Which one is an example of a property?(a) Pressure(b) Temperature(c) Volume(d) All of the mentionedThis question was addressed to me in a national level competition.My doubt stems from Energy Balances topic in chapter Energy Balances of Chemical Process Calculation