1
GATE ME 2002
MCQ (Single Correct Answer)
+2
-0.6
The efficiency of superheat Rankine cycle is higher than that of simple Rankine cycle because
A
the enthalpy of main steam is higher for superheat cycle
B
the mean temperature of heat addition is higher for superheat cycle
C
the temperature of steam in the condenser is high
D
the quality of steam in the condenser is low
2
GATE ME 2000
MCQ (More than One Correct Answer)
+2
-0
For a compressible fluid, sonic velocity is
A
a property of the fluid
B
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 $$K$$
C
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
D
always greater than the velocity of fluid at any location.
3
GATE ME 1998
MCQ (Single Correct Answer)
+2
-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
A
$$50$$
B
$$40$$
C
$$60$$
D
$$75$$
4
GATE ME 1997
MCQ (Single Correct Answer)
+2
-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

A
$$124$$ $$kJ$$
B
$$164$$ $$kJ$$
C
$$169$$ $$kJ$$
D
$$174$$ $$kJ$$
GATE ME Subjects
Turbo Machinery
EXAM MAP