This set of Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Energy Types”.
1. Which of the following is not the type of energy?
a) Enthalpy
b) Heat
c) Entropy
d) Work
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Explanation: Entropy is not a type of energy.
2. Which of the following process P-V work in highest?
a) Second derivative is negative
b) Second derivative is positive
c) Second derivative is zero
d) All of the mentioned
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Explanation: Work in highest when the area under the P-V curve is highest, which is when the second derivative of the curve is negative.
3. An object is moved from one position to another with a specific force, what type of work is it?
a) Shaft Work
b) Flow Work
c) Mechanical Work
d) None of the mentioned
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Explanation: Since work is caused by mechanical force it is a mechanical work.
4. An object is moved at a distance of 10 m with the force of 5 N, what is the work done by the force?
a) 5 Joule
b) 50 Joule
c) 500 Joule
d) 5000 Joule
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Explanation: Work = 10*5 = 50 N-m = 50 Joule.
5. An object moved forward 10 meters and then comes back 5 meter all with a constant force of 5 N, what is the work done by the force?
a) 5 Joule
b) 25 Joule
c) 50 Joule
d) 75 Joule
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Explanation: Work = (10 – 5)* 5 = 25 Joule.
6. A piston cylinder is compressed with some pressure, what is the work done on the system?
a) Positive
b) Negative
c) Zero
d) Cannot say
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Explanation: Since pressure and displacement are positive their products are also positive, => work done on the system is positive.
7. A piston cylinder expands with some pressure, what is the work done by the system?
a) Positive
b) Negative
c) Zero
d) Cannot Say
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Explanation: Since direction of displacement and force are same, work done will be positive.
8. A piston cylinder contracts from 10 Liter to 5 Liter with an external pressure of 10 Pa, what is the work done on the system?
a) 0.5 mJ
b) 5 mJ
c) 10 mJ
d) 50 mJ
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Explanation: Work = 10*(10 – 5) = 50 mJ.
9. A piston cylinder expands from 7 liter to 15 liter with the external pressure of 500 Pa, what is the work done by the system?
a) – 1.5 Joule
b) – 4 Joule
c) 1.5 Joule
d) 4 Joule
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Explanation: Work = 500*(15 – 7) = 4000 mJ = 4 Joule.
10. A piston cylinder expands from 8 liter to 12 liter with the external pressure of 900 Pa, what is the work done on the system?
a) 3.6 Joule
b) – 3.6 Joule
c) 7.2 Joule
d) – 7.2 Joule
View answer
Explanation: Work done on the system = 900(8 – 12) = – 3600 mJ = – 3.6 J.
11. You shake a thermos so that the temperature of tea inside increases by 2oC, if you transferred Q amount of heat to the thermos, which of the following satisfies Q?
a) Q > 0
b) Q < 0
c) Q = 0
d) Cannot say
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Explanation: If you are shaking a thermos, you are doing work on it not transferring any heat.
12. Q amount of heat is transferred in an adiabatic process, which of the following is correct?
a) Q > 0
b) Q = 0
c) Q < 0
d) Cannot say
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Explanation: In an adiabatic process Q = 0.
13. Q amount of heat is transferred to a system, which of the following is correct?
a) Q > 0
b) Q < 0
c) Q = 0
d) Cannot say
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Explanation: Since heat is transferred to a system, => Q > 0.
14. Temperature of a system is increased with no change in internal energy, if the work done by the system is 10 Joule, what amount of heat is taken out from the system?
a) 10 J
b) – 10 J
c) 0
d) 5 J
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Explanation: W = – 10, => 0 = Q + W, => Q = 10 J, => amount of heat taken out = – 10 J.
15. Ratio heat transferred from 37oC to a colder body and from that body to – 11oC is 2, what is the temperature of colder body if surface areas are same for all bodies?
a) – 5oC
b) – 3oC
c) 5oC
d) 9oC
View answer
Explanation: 2 = (37 – T)/(T + 11), => T = 5oC.
Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.
To practice all areas of Basic Chemical Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.