GATE ME 2000 | Rankine Cycle Question 33 | Thermodynamics

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

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

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

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

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

GATE ME 1997

MCQ (Single Correct Answer)

-0.6

The following data pertain to a single stage impulse steam turbine:
Nozzle angle $$=$$ $${20^ \circ };$$
Blade velocity $$= 200$$ $$m/s;$$
Relative steam velocity at entry $$= 350$$ $$m/s;$$
Blade inlet $$30;$$
Blade exit angle $$ = {25^ \circ }.$$

If blade friction is neglected, the work done per $$kg$$ steam is

$$124$$ $$kJ$$

$$164$$ $$kJ$$

$$169$$ $$kJ$$

$$174$$ $$kJ$$

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