GATE ME 2002 | Rankine Cycle Question 27 | Thermodynamics

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GATE ME 2002

MCQ (Single Correct Answer)

-0.6

The efficiency of superheat Rankine cycle is higher than that of simple Rankine cycle because

the enthalpy of main steam is higher for superheat cycle

the mean temperature of heat addition is higher for superheat cycle

the temperature of steam in the condenser is high

the quality of steam in the condenser is low

GATE ME 2000

MCQ (More than One Correct Answer)

-0.6

For a compressible fluid, sonic velocity is

a property of the fluid

always given by $${\left( {\gamma RT} \right)^{{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}}}$$ where $$\gamma $$, $$R$$ and $$T$$ are respectively the ratio of specific heats, gas constant and temperature in $$K$$

always given by $${\left( {\partial p/\partial \rho } \right)_s}^{{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}}.$$ Where $$P,$$ $$\rho $$ and $$s$$ are respectively pressure, density and entropy

always greater than the velocity of fluid at any location.

GATE ME 1998

MCQ (Single Correct Answer)

-0.6

The isentropic heat drop in the nozzle of an impulse steam turbine with a nozzle efficiency $$0.9,$$ blade velocity ratio $$0.5,$$ and mean blade velocity $$150$$ $$m/s$$ in $$kJ/kg$$ is

$$50$$

$$40$$

$$60$$

$$75$$

GATE ME 1997

MCQ (Single Correct Answer)

-0.6

Consider an actual regenerative Rankine cycle with one open feed water heater. For each $$kg$$ steam entering the turbine, if $$m$$ $$kg$$ steam with a specific enthalpy of $${h_1}$$ is bled from the turbine, and the specific enthalpy of liquid water entering the heater is $${h_2},$$ then $${h_3},$$ the specific enthalpy of saturated liquid leaving the heater is equal to

$$m{h_1} - \left( {{h_2} - {h_1}} \right)$$

$${h_1} - m\left( {{h_2} - {h_1}} \right)$$

$${h_2} - m\left( {{h_2} - {h_1}} \right)$$

$$m{h_2} - \left( {{h_2} - {h_1}} \right)$$

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