Which among the following is the boiler mounting?
Boiler rating is usually defined in terms of
Assertion (A): Fire tube boilers do not operate at high pressures while water tube boilers operate at high pressures Reason (R): Due to high temperature of flue gases, fire tubes may fail due to creep.
Match List-I (Name of boiler) with List-II (Special features) and select the correct answer using the codes given below the lists
A. Lancashire 1. High pressure water tube
B. Cornish 2. Horizontal double fire tube
C. La Mont 3. Vertical multiple fire tube
D. Cochran 4. Low pressure inclined water tube
5. Horizontal single fire tube
Lancashire boiler is horizontal double fire tube type, Cornish boiler is horizontal single fire tube type. La Mont boiler is high pressure water type, and Cochran boiler is vertical multiple fire tube type.
Which one of the following is the fire-tube boiler?
There is no steam drum in
Consider the following components:
1. Radiation evaporator
3. Radiation super heater
4.Convection super heater
In the case of Benson boiler, the correct sequence of the entry of water through these components is:
The correct sequence of water entry in Benson boiler is economiser, radiation evaporator, radiation super heater and finally convection super heater.
When inspection doors on the walls of boilers are opened, flame does notleap out because
Assertion (A): Fire tube boilers have quick response to load changes.Reason (R): Fire tube boilers have large water storage capacity and hence smallpressure changes can meet sudden demands.
Assertion (A): Benson boiler is much lighter than other boilers Reason (R): Boiler pressure raised to the critical pressure in Benson boiler permits doing away with steam (separating) drums.
Both A and R are true and R is the correct explanation of A
Benson boiler is lighter and one of the reasons is absence of boiler drum. However lightness is due to elimination of water walls also. Thus both A and R is true and R is also explanation for A.
The Rateau turbine belongs to the category of
A Curtis stage, Rateau stage and a 50% reaction stage in a steam turbine are examples of
A steam turbine receives steam steadily at 10 bar with an enthalpy of 3000kJ/kg and discharges at 1 bar with an enthalpy of 2700 kJ/kg. The workoutput is 250 kJ/kg. The changes in kinetic and potential energies are negligible. The heat transfer from the turbine casing to the surroundingsis equal to
Enthalpy drop = Power output + losses Or 3000 – 2700 = 250 + losses Or losses = 50 kJ to the surrounding
The practice to use steam on the shell side and cooling water on the tubeside in condensers of steam power plant is because
Specific volume of steam is large. More volume is required for steam. Hence shell side is used for steam and water is circulated through the tube in condenser
What is the ratio of the isentropic work to Euler's work known as?
In an ideal impulse turbine, the
For an ideal impulse turbine, relative velocity at inlet of the moving blade is equal to that at the outlet.
Steam enters a De Laval steam turbine with an inlet velocity of 30 m/s and leaves with an outlet velocity of 10 m/s. The work done by 1kg of steam is
Which one of the following velocity triangles represents the one at the exit of a radial impeller with forward curved blades?
(u2 = peripheral velocity, v2 = absolute velocity, w2 = relative velocity).
Velocity triangle at (b) is correct. Actual velocity v2 is at right angle and angle between u2 and w2 is acute
In an axial flow impulse turbine, energy transfer takes place due to