Chemical Process Calculation Mcqs

Q:

There must be no accumulation of mass or energy over the time period of interest in a _________

A) Steady state B) Unsteady state
C) Closed D) None of the mentioned
 
Answer & Explanation Answer: A) Steady state

Explanation: There must be no accumulation of mass or energy over the time period of interest in a Steady state.

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Q:

If 25 J is work is done by a system and same amount of heat is also supplied to the system. What kind of system is it?

A) Steady state B) Unsteady state
C) Closed D) None of the mentioned
 
Answer & Explanation Answer: A) Steady state

Explanation: ∆E is equal to zero.

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Q:

If 25 J is work is done on a system and same amount of heat is also supplied. What kind of system is it?

A) Steady state B) Unsteady state
C) Closed D) None of the mentioned
 
Answer & Explanation Answer: B) Unsteady state

Explanation: ∆E is not equal to zero.

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49
Q:

10 J of heat is supplied to a system and a work of 30 J performed on it. If 50 J of heat is removed from the system, which type of system is it?

A) Steady state B) Unsteady state
C) Closed D) None of the mentioned
 
Answer & Explanation Answer: B) Unsteady state

Explanation: ∆E is not equal to zero.

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45
Q:

20 J of heat is supplied to a system and a work of 30 J performed on it. If 50 J of heat is removed from the system, which type of system is it?

A) Steady state B) Unsteady state
C) Closed D) None of the mentioned
 
Answer & Explanation Answer: A) Steady state

Explanation: ∆E = 0.

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47
Q:

25 J of work is done by a steady state system, what is the heat supplied to the system?

A) – 25 J B) 25 J
C) 20 J D) – 20 J
 
Answer & Explanation Answer: B) 25 J

Explanation: 0 = – 15 + Q.

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Q:

10 J of heat is removed from a steady state system, what is the work done on the system?

A) – 10 J B) 10 J
C) – 5 J D) 5 J
 
Answer & Explanation Answer: B) 10 J

Explanation: 0 = – 10 + W.

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39
Q:

If x J of work is done on a steady system, what is the heat for the system?

A) + x J B) –x J
C) 0 J D) None of the mentioned
 
Answer & Explanation Answer: B) –x J

Explanation: Change in the internal energy for a steady-state system is always zero so Q + W= 0.

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