Separation Processes Questions and Answers – Energy, Entropy and Availability Balance

This set of Separation Processes Questions and Answers for Freshers focuses on ” Energy, Entropy and Availability Balance”.

1. Which of the following is a correct equation of energy balance?
a) ∑_{out of system} nh+Q+Ws – ∑in_system nh+Q+Ws=0
b) ∑_{out of system} nh+Ws- ∑in_system nh+Q+Ws=0
c) ∑_{out of system} nh+Q+Ws – ∑in_system nh+Ws=0
d) ∑_{out of system} nh+Ws – ∑in_system nh+Ws=0
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2. Which of the following is a correct equation for entropy balance?
a) ∑_{out of system} (nS+Q/Ts) – ∑in_system (nS)=0
b) ∑_{out of system} (nS+Q/Ts) – ∑in_system (nS+Q/Ts)=ΔS_r
c) ∑_{out of system} (nS) – ∑in_system (nS+Q/Ts)=ΔS_r
d) ∑_{out of system} (nS+Q/Ts) – ∑in_system (nS+Q/Ts)=0
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3. What is the formula for minimum work of separation?
a) ∑_{out of system} (nb) – ∑in_system (nb)=W_s
b) ∑_{out of system} (nb) – ∑in_system (nb)=0
c) ∑_{out of system} (nb) – ∑in_system (nb)= ΔS_r
d) ∑_{out of system} (nb) – ∑in_system (nb)=Δnb
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4. What is the formula for efficiency?
a) η = W_min /(LW + W_max)
b) η = W_max /(LW + W_max)
c) η = W_min /(LW + W_max)
d) η = W_min /( W_max)
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5. What is the maximum of energy converted to shaft work if stream is taken to reference state?
a) Gibbs energy
b) Availability function
c) Entropy
d) Change in entropy
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6. What is the formula for lost work?
a) LW = h- TΔS
b) LW = T₀ – TΔS_irr
c) LW = T₀ ΔS_irr
d) LW = T₀ – S_irr
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7. What is the magnitude of lost work not dependent upon?
a) Process irreversibilities
b) Fluid friction
c) Mass transfer due to finite concentration
d) Mass transfer due to finite temperature driving forces
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8. Why does the reduce in lost work have limitation?
a) Equipment size decreases
b) Equipment size increases
c) Flow rate decreases
d) Flow rate increases
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9. What is the lost work is absolute temperature is 303K and the change in entropy is 1000KJ/h-k
a) 697KJ/h-k
b) 303000KJ/h
c) 3030KJ/h
d) 30300KJ/h-k
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10. If the minimum work of separation is 100KJ and the lost work is 1000KJ, what is the efficiency of separation process?
a) 10%
b) 11%
c) 9.09%
d) 11.11%
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Sanfoundry Global Education & Learning Series – Separation Processes.

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