When an open vessel containing water is taken to hill top and heated, the water starts boiling at
Less than 100oC temperature
More than 100oC temperature
At 100oC temperature
A wet vapour can be completely specified by its
Pressure and dryness fraction
Pressure and temperature
Which of the following parameter remains constant during super-heating of steam?
During formation of steam at atmospheric pressure, the temperature was noted to be 110oC. it suggests that the steam is
Dry and saturated
For complete specification of superheated vapour, one needs
Pressure as well as temperature
Steam is being raised at a constant pressure of 10bar. The volume will be least when its condition is
Water at 90oC
Wet steam with 0.9 dryness fraction
Dry saturated steam
Superheated steam with 50oC degree of superheat
Which form of the vapour has a behaviour close to that of a gas?
Wet vapour only
Dry and saturated vapour
Wet and dry vapour
Which of the following is a false statement in the context of boilers?
The basic purpose of drum in a boiler is to serve as a reservoir for storage of steam
In package boiler, the various parts like firing equipment, fans, feed pump and automatic controls are mounted on a single base
The size of boiler tubes is specified by outside diameter and thickness
Cocharn and scotish marine boilers have horizontal fire tubes
Gusset stays are provided to prevent bulging of flat surface
Which of the following equipment is a boiler accessory?
Feed water pump
Blow off cock
Which of the following fitting is a boiler mounting?
Feed check valve
Which of the following is fitted on a boiler to improve the boiler efficiency?
Blow down cock
Which of the following is the boiler mounting?
Blow off cock
The duplex feed pump for a steam boiler belongs to the category of
An economizer is fitted with a boiler to
Increase the steam pressure
Heat the fuel of low calorific value
Heat the air entering the fire grate
Heat the feed water by exhaust flue gases
The economizer unit of a boiler is located between
Forced draught fan and furnace
Furnace ad superheater
Superheater and air preheater
Air preheater and chimney