Steam Nozzles and Turbines - Data Intensity 2 | Multiple Questions and Answers

1.	A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

	A.	79 m/s
	B.	188 m/s
	C.	450 m/s
	D.	900 m/s

2.	The flow of steam is super-sonic

	A.	at the entrance to the nozzle
	B.	at the throat of the nozzle
	C.	in the convergent portion of the nozzle
	D.	in the divergent portion of the nozzle

4.	The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 ?, where ? is the nozzle exit flow angle, if the

	A.	blades are equiangular
	B.	blade velocity coefficient is unity
	C.	blades are equiangular and frictionless
	D.	blade solidity is 0.65

5.	When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

	A.	divergent nozzle
	B.	convergent nozzle
	C.	convergent-divergent nozzle
	D.	none of these