Engineering :: Heat Engines

@ : Home > Mechanical Engineering > Heat Engines

181.

A turbo-charger is used

A.	In gas turbines for compression of air	B.	For supercharging reciprocating engine
C.	In jet propulsion units	D.	In rockets for producing air fuel mixture
E.	None of the above

182.

Which of the following is false statement? The cause of slow cranking of a gas engine during starting may be

A.	Partially discharged battery	B.	Heavy engine oil
C.	Faulty starting motor	D.	Under capacity battery
E.	High air temperature

183.

Which of the following is false statement?

A.	Fuel consumption of engine increases if silencer is choked	B.	Fuel consumption of engines decreases if air filter is choked
C.	Fuel consumption increases if exhaust valve is burnt	D.	Fuel consumption increases if lean mixture is supplied
E.	All of the above

184.

Which statement is false in case of SI engines

A.	Increasing the length of the carbon chain increases the knocking tendency	B.	Centralising the carbon atoms decreases the knocking tendency
C.	Adding methyl groups to the side of the carbon chain increases the knocking tendency	D.	Unsaturated aliphatic hydrocarbons show less knocking tendency
E.	Accetylene has least tendency to knocking

185.

Thermal efficiency of a spark ignition engine at full load usually is in the range

186.

For the same maximum pressure and heat input, the most efficient cycle is

A.	Brayton	B.	Otto
C.	Diesel	D.	Dual

187.

For the same temperature limits and heat input, the most efficient cycle is

A.	Carnot	B.	Otto
C.	Diesel	D.	Brayton
E.	All of the above have same efficiency

188.

If performance of SI engines of different manufacture having different capacities, sizes and systems are to be compared the common parameter would be

189.

A Lenoir cycle has a top temperature in the cycle

A.	More than that of Otto cycle	B.	Between Otto and diesel cycles
C.	Equal to diesel cycle	D.	Less than diesel cycle

190.

For the same maximum pressure and heat input the least efficient cycle is

A.	Brayton	B.	Otto cycle
C.	Diesel cycle