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261.

A sample having pH value of 5 will be

A.	Neutral	B.	Acidic
C.	Alkalino

262.

If a steam injector fails to lift the water the trouble may not be due to

A.	Too low steam pressure for list	B.	Water pipe clogged
C.	Water supply to cold	D.	End of water pipe not submerged

263.

If a steam injector lifts the water but fails to force it into the boiler, the trouble may not be due to

A.	Combining tube clogged	B.	Insufficient steam pressure
C.	Sry steam	D.	Leake in water pipe
E.	Any of the above

264.

Safety valve generally used on high pressure boiler is

A.	Dead weight type	B.	Lever type
C.	Combination lever and spring type	D.	Spring type
E.	None of the above

265.

With reference to a safety valve the blow down pressure is the pressure at which

A.	Valve opens	B.	Valve closes after opening
C.	Valve opens initially	D.	Valve spring pressure is adjusted
E.	None of the above

266.

A 'blue' flame is

A.	Non-radiant flame	B.	Radiant flame
C.	Super high temperature flame	D.	Ordinary flame in oil burners
E.	None of the above

267.

In oil burners air is supplied

A.	To assist inflow of oil	B.	To prevent clogging of burner
C.	To improve combustion efficiency	D.	To uniformly spray oil in combustion chamber
E.	None of the above

268.

Low grade fuels have

269.

Which variety of coal has low calorific value?

A.	Steam coal	B.	Bituminous coal
C.	Lignite	D.	Anthracite

270.

Capacitor kVA required to bring the power factor of a 500 kW load 70% to 85% would be