1
GATE ME 2007
MCQ (Single Correct Answer)
+1
-0.3
Which of the following relationships is valid only for reversible process undergone by a closed system of simple compressible substance (neglect changes in kinetic and potential energy?
A
$$\delta Q = dU + \delta W$$
B
$$T\,\,dS = dU + p\,dv$$
C
$$T\,\,dS = dU + \delta W$$
D
$$\delta Q = dU + p\,\,dv$$
2
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
Which combination of the following statements is correct?

The incorporation of re-heater in a steam power plant.

$$P:$$ always increases the thermal efficiency of the plant.
$$Q:$$ always increases the dryness function of steam at condenser inlet.
$$R:$$ always increases the mean temperature of heat addition
$$S:$$ always increases the specific work output.

A
$$P$$ and $$S$$
B
$$Q$$ and $$S$$
C
$$P,R$$ and $$S$$
D
$$P,Q,R$$ and $$S$$
3
GATE ME 2007
MCQ (Single Correct Answer)
+1
-0.3
The inlet angle of runner blades of a Francis turbine is $${90^0}.$$ The blades are so shaped that the tangential component of velocity at blade outlet is zero. The flow velocity remains constant throughout the blade passage and is equal to half of the blade velocity at runner inlet. The blade efficiency of the runner is
A
$${25^0}.$$
B
$${50^0}.$$
C
$${80^0}.$$
D
$${89^0}.$$
4
GATE ME 2007
MCQ (Single Correct Answer)
+1
-0.3
A model of a hydraulic turbine is tested at a head of $$1/{4^{th}}$$ of that under which the full scale turbine works. The diameter of the model is half of that of the full scale turbine. If $$N$$ is the $$RPM$$ of the full scale turbine, then the $$RPM$$ of the model will be
A
$$N/4$$
B
$$N/2$$
C
$$N$$
D
$$2N$$
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