Thermodynamics Miscellaneous Easy Questions and Answers | Page - 11

Thermodynamics Miscellaneous

For a given set of operating pressure limits of a Rankine cycle the highest efficiency occurs for

1. Saturated cycle
1. Superheated cycle
1. Reheat cycle
1. Regenerative cycle

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For a given set of operating pressure limits of a Rankine cycle the highest efficiency occurs for Regenerative cycle .

Correct Option: D

For a given set of operating pressure limits of a Rankine cycle the highest efficiency occurs for Regenerative cycle .

A gas turbine cycle with heat exchange and reheating improves

1. Only the thermal efficiency
1. Only the specific power output
1. Both thermal efficiency and specific power output
1. Neither thermal efficiency nor specific power output

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Both thermal efficiency and specific power output

Correct Option: C

Both thermal efficiency and specific power output

In problem above, find the actual work and maximum work per kg air.

1. 112.04 K J /k g – maximum work
  370 K J /K g – Actual work
1. 312.04 K J /k g – maximum work
  270 K J /K g – Actual work
1. 112.04 N/kg – maximum work
  210 K J /Kg – Actual work
1. 172.04 N/kg – maximum work
  110 K J /Kg – Actual work

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312.04 K J /k g – maximum work
270 K J /K g – Actual work

Correct Option: B

312.04 K J /k g – maximum work
270 K J /K g – Actual work

Air expands steadily through a turbine from 6 bar, 800 K to 1 bar, 520 K. During the expansion, heat transfer from air to the surroundings at 300 K is 10 kJ/kg air. Neglect the changes in kinetic and potential energies and evaluate the irreversibility per kg air. Assume air to behave as an ideal gas with c_p = 1.0 kJ/kgK and R = 0.3 kJ/kgK.

1. I = 300 C_pln T₂ - Rln P₂ + 10
  T₁ P₁ 300
1. I = 100 C_pln T₂ - Rln P₂ + 300
  T₁ P₁ 10
1. I = 300 C_pln T₁ - Rln P₂ + 10
  T₂ T₁ 300
1. I = 300 C_pln T₁ - Rln P₁ + 1
  T₂ P₂ 3

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I = T₀( ∆S )_un
= 70( ∆S )_system ( ∆S )_surr
I = S₂ - S₁ + q
T₀

I = 300 C_pln T₂ - Rln P₂ + 10
T₁ P₁ 300

Correct Option: A

I = T₀( ∆S )_un
= 70( ∆S )_system ( ∆S )_surr
I = S₂ - S₁ + q
T₀

I = 300 C_pln T₂ - Rln P₂ + 10
T₁ P₁ 300

In steam and other vapour cycle, the process of removing non-condensable is called

1. Scavenging process
1. Deaeration process
1. Exhaust process
1. Condensation process

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In steam and other vapour cycle, the process of removing non-condensable is called Deaeration process

Correct Option: B

In steam and other vapour cycle, the process of removing non-condensable is called Deaeration process