# Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes

This quiz contains multiple-choice problems on potential energy, kinetic energy, internal energy and their conversion concepts, energy balances for open, closed, steady and unsteady state systems, phase transitions and heat capacity equations.

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What is the potential energy change of a stone of mass 1 kg when thrown up with a velocity of 10 m/s and coming down?

0

10 J

100 J

500 J

What is the kinetic energy of an object of mass 2 kg and velocity 5 m/s?

20 J

25 J

35 J

50 J

What is the specific kinetic energy of a fluid flowing at rate 0.1 m^3/s and 1 m diameter pipe?

0.008 J/Kg

0.016 J/Kg

0.028 J/Kg

0.064 J/Kg

A ball is thrown up and someone catches it on the cliff. What is the change in the potential energy of the ball?

Positive

Negative

Zero

Cannot say

A stone is thrown up with a velocity and comes down. What is the change in the kinetic energy of the stone?

Positive

Negative

Zero

Cannot say

A stone is released from a cliff and comes down. What is the change in the kinetic energy of the stone?

Positive

Negative

Zero

Cannot say

Which of the following can definitely cause vapourization?

Heating a liquid

Heating a liquid at constant pressure

Cooling a liquid

Cooling a liquid at constant volume

What do we call a process having constant volume throughout?

Which of the following satisfies the first derivative of adsorption isotherms?

Greater than 1

Less than 1

Equal to 1

Cannot say

Which of the following is an intensive variable?

Moles

Enthalpy per mole

Enthalpy

All of the above

Which of the following represents vapourization?

Change of vapour to liquid

Change of vapour to solid

Change of solid to vapour

Change of liquid to vapour

For an open unsteady state system, 10 J of heat was supplied, and the system did 10 J of work. What is the value of enthalpy change?

0

10 J

20 J

– 20 J

What is the point of saturation for a condensable vapour?

Bubble point

Boiling point

Triple point

Dew point

For an open unsteady state system, 5 J of heat was supplied and the system did 10 J of work. What is the value of enthalpy change?

-5 J

5 J

10 J

15 J

Quiz/Test Summary
Title: Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes
Questions: 14
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