What is Boiler mountings and accessories>
Write down three names of mountings and accessories. (Asuganj Power Station limited )
Mountings: These are the fittings which are
mounted on the boiler for its proper and safe functioning. Boiler mountings
are:-
1) Water level Indicator 2) Pressure Gauge
3) Blow-off-cock 4) Fusible plug 5) safety valve
Accessories: These are the devices which
are used as integral parts of a boiler and help in running efficiently. Boiler
accessories are:-
1) Feed pump 2) Economizer 3) Super heater
What is parallel flow heat exchanger and counter
current flow heat exchanger? (Asuganj Power station limited, Bangladesh Bank-2012 )
Parallel flow Heat Exchanger: Parallel flow
heat exchangers, the fluid flow in the same direction. The temperature
difference is maximum at inlet and rate of flow of heat and the rate of
decrease of temperature are maximum here.
Counter-Current flow heat exchanger: In
counter current flow heat exchanger the fluids flow in the opposite directions.
The heat transfer takes place between the fluids at the moment when each is in
its coldest state or when each is in its hottest state. The average temperature
between two fluids is greater than in parallel flow heat exchanger.
What is ton of refrigeration? (Asuganj Power
Station Limited)
Ton of Refrigeration: A ton of refrigeration is defined as the
amount of refrigeration effect produced by the uniform melting of one ton (1000
Kg) of ice from and at 00C in 24 hours.
Write down the Bernoulli’s Equation. (Asuganj Power
station Company Limited)
Bernoulli’s Equation stats that for a
perfect in-compressible liquid flowing in a continuous steam the total energy of
particle remains the same while the particle moves from one point to another.
Mathematically, + + Z1 =+ + Z2
What is the difference between shaper and
Planer?
The fundamental difference between a shaper
and planer is that in a Planer, the tool remains stationary and the work
reciprocates whereas in a shaper, the work remains stationary and the tool
reciprocates.
What is absolute pressure? (DHAKA WASA )
Absolute Pressure = Atmospheric Pressure +
Gauge Pressure