Engineering :: Heat Engines

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221.

The boilers using lignite as fuel do not use

A.	Underfeed stoker	B.	Travelling grate stoker
C.	Speader stoker	D.	U-flame pulverized fuel burner
E.	Horizontal burner, pulverized fuel

222.

A wankel engine is

A.	Rotory engine	B.	Reciprocating engine
C.	Hybrid engine	D.	Turbine engine
E.	Jet engine

223.

In multistages turbines by introducting reheating

A.	Thermal efficiency improves	B.	The output of turbine increases
C.	Work done by compressor reduces	D.	The ratio compressor compressor work/turbine output decreases
E.	None of the above

224.

The blades of a turbine are made of

A.	Cast iron	B.	Nickel alloy
C.	Stainless steel	D.	Alloy steel
E.	High speed steel

225.

In jet engines the compression ratio

A.	Varies with altitude	B.	Varies with square of speed
C.	Varies as cube of speed	D.	Remains constant
E.	None of the above

226.

A gas turbine plant operates between 1 ata and 9 ata with minimum and maximum cycle temperature of 25?C and 1000?C. A two stage compressor is provided with perfect intercooling and work is equally divided between the two stages. The intermediate pressure will be

A.	3 ata	B.	4 ata
C.	5 ata	D.	5.5 ata
E.	7.5 ata

227.

The air standard efficiency of a turbine cycle is 56.5%, which one of the following may be Carnot efficiency between the temperature limits of the cycle?

A.	56.50%	B.	64%
C.	50%	D.	75%
E.	100%

228.

A gas turbine cycle operates through pressures ratio of 5. Air enters the compressor at atmospheric pressure and 25?C and entry to the turbine is at 800?C. The thermal efficiency of the plant has been found to be 37%. Now, if compressor and turbine efficiencies of 80% are taken into account, the value, of thermal efficiency will be

A.	17.75%	B.	37%
C.	38.50%	D.	40%
E.	45%

229.

LPG stands for

A.	Liquefied petroleum gas	B.	Low pressure gas
C.	Light pressure gas	D.	Lubricated petroleum gas
E.	None of the above

230.

A gas turbine works on

A.	Rankine cycle	B.	Carnot cycle
C.	Brayton cycle	D.	Erricson cycle
E.	Joule cycle