Related Questions

In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, 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
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
A Greater degree of separation with a fixed number of trays
B Increased reboiler load
C Increased reflux ratio
D None of these
Duplex feed pumps are used in small steam boilers. These operate on the principle of
A Centrifugal pump
B Axial flow pump
C Gear pump
D Reciprocating pump
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
A Regenerative heating
B Reheating of steam
C Bleeding
D None of these
Very high pressure boilers are usually __________ boilers.
A Fire tube
B Water tube
C Waste heat
D Natural circulation
For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is
A More
B Less
C Equal
D Either A or B; depends on the viscosity of the fluid
The feed check valve is used in order to
A Regulate flow of boiler water
B Check level of water in boiler drum
C Recirculate unwanted feed water
D Allow high pressure feed water to flow to drum and not allow reverse flow to take place
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
A Greater than
B Less than
C Equal to
D None of these
Function of feed check valve in a boiler is to
A Facilitate circulation of high pressure feed water
B Check the water level in the boiler drum
C Prevent the back flow of water
D Regulate the water flow to boiler
A safety valve mainly used with locomotive and marine boilers is
A Lever safety valve
B Dead weight safety valve
C High steam and low water safety valve
D Spring loaded safety valve

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