Steam Boilers and Engines Questions

• Which of the following statement is correct?
• A condenser maintains a low pressure (below atmospheric) so as to obtain the maximum possible energy from steam and thus to secure a high efficiency.
• The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.
• The indicated thermal efficiency is defined as the
• A device used to empty the boiler whenever required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler, is called blow off cock.
• In fire tube boilers
• The value of diagram factor depends upon
• Water tube boilers are
• In a Woolf type compound engine, the high pressure and low pressure cylinders
• The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, mf = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and hf1 = Sensible heat of feed water in kJ /kg)
• The efficiency of a boiler is defined as
• For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be
• Clearance ratio is the ratio of
• The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
• A water level indicator is a device to indicate the exact water level in the boiler at any instant.
• In a boiler, the heat is lost
• In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
• The working pressure range for a La-Mont boiler is
• The function of a valve rod is
• The function of an eccentric rod is