What are the four main components of a Rankine cycle?

Pump, boiler, turbine, condenser

True or False: In a Brayton cycle, the working fluid remains in gas phase throughout.

True

The thermal efficiency formula for any power cycle is ηₜₕ = _____

Wₙₑₜ / qᵢₙ

Which process in Rankine cycle: 2-3 represents?
A) Isentropic compression
B) Constant pressure heat addition
C) Isentropic expansion
D) Heat rejection

B) Constant pressure heat addition

What does regenerative feedwater heating accomplish in Rankine cycles?

Increases average temperature of heat addition

The back work ratio is typically higher in _____ cycles than Rankine cycles.

Brayton

True or False: Pump work in Rankine cycle equals v₁(P₂ - P₁) for incompressible liquid.

True

Why does Brayton cycle have high back work ratio?
A) Low turbine efficiency
B) Gas compression requires more work than liquid pumping
C) High pressure losses
D) Poor heat transfer

B) Gas compression requires more work than liquid pumping

Steam quality x in two-phase region is calculated as _____

(s - sₓ) / sₓ_g

What happens when reheat is added to Rankine cycle?

Reduces moisture content in turbine exit

The pressure ratio rₚ in Brayton cycle equals _____

P₂/P₁

True or False: Intercooling in Brayton cycle increases compressor work requirements.

False - intercooling reduces compressor work

For ideal gas isentropic process: T₂/T₁ = _____

(P₂/P₁)^((k-1)/k)

Which improvement increases turbine work in Brayton cycle?
A) Intercooling
B) Regeneration
C) Reheating
D) Higher compression ratio

C) Reheating

Turbine isentropic efficiency formula: ηₜᵤᵣᵦᵢₙₑ = _____

Wₐcₜᵤₐₗ / wᵢₛₑₙₜᵣₒₚᵢc

What is the typical back work ratio range for Brayton cycles?

40-80%

True or False: Regenerator effectiveness can exceed 100% in Brayton cycles.

False - effectiveness cannot exceed 100%

If steam exits turbine in two-phase region, enthalpy equals hₓ + _____

X·hₓ_g

Open feedwater heater differs from closed because:
A) Higher pressure
B) Steam mixes directly with feedwater
C) Better heat transfer
D) Lower cost

B) Steam mixes directly with feedwater

What limits regeneration effectiveness in Brayton cycles?

Temperature difference between turbine exit and compressor exit

For air standard analysis, k approximately equals _____

1.4

True or False: Combined cycle plants can achieve thermal efficiency exceeding 60%.

True

Optimal intercooler pressure for minimum compressor work: Pᵢₙₜₑᵣ = _____

√(P₁P₂)

Which cycle analysis uses steam tables for property evaluation?
A) Otto cycle
B) Diesel cycle
C) Rankine cycle
D) Brayton cycle

C) Rankine cycle

What is the primary advantage of combined cycle power plants?

Very high thermal efficiency using waste heat recovery

Brayton cycle thermal efficiency formula: ηₜₕ = 1 - _____

1/rₚ^((k-1)/k)