Related Questions

β-rays emission in radioactive disintegration is always accompanied by the emission of
A γ-rays
B α-rays
C Neutrons
D None of these
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will
A Cause withdrawing or throttling of steam
B Reduce length of effective stroke of piston
C Reduce maximum opening of port to steam
D All of these
Throttle governing of steam engines is a method of controlling the engine output by varying
A Volume of intake steam
B Pressure of intake steam
C Temperature of intake steam
D All of these
Cut-off governing of steam engines is a method of controlling the engine output by varying
A Volume of intake steam
B Pressure of intake steam
C Temperature of intake steam
D All of these
Which one of the following weeds is effective in controlling water pollution caused by industrial effluents?
A Parthenium
B Elephant grass
C Water hycinth
D Mogar grass
When water emulsion is used as the fuel in SI engine the emission of nitrogen oxides reduces significantly, this is due to
A Water reacts with nitrogen oxides
B Water does not contain nitrogen
C The combustion temperature decreased
D The combustion temperature increased
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of
A CO2
B CO
C Unburnt petrol
D SO2
The size of inlet valve of an engine in comparison to exhaust valve is
A More
B Less
C Same
D More/less depending on capacity of engine
The exhaust valve in a four stroke cycle petrol engine
A Opens at 50° before bottom dead center and closes at 15° after top dead center
B Opens at bottom dead center and closes at top dead center
C Opens at 50° after bottom dead center and closes at 15° before top dead center
D May open and close anywhere
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine
A Lancashire boiler
B Locomotive boiler
C Babcock and Wilcox boiler
D Benson boiler

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