০০। A closed vessel made of steel and used for the generation of steam is called a
ক) steam boiler
খ) steam turbine
গ) steam condenser
ঘ) steam injector
০১। A Cochran boiler is a horizontal multi-tubular boiler.
ক) Yes
খ) No
০২। A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called
ক) receiver type compound engine
খ) Tandem type compound engine
গ) Woolf type compound engine
ঘ) both (a) and (b)
০৩। A compound steam engine in which piston rods of high pressure and low pressure cylinders’ are attached to two different cranks set at 180° to each other, is called
ক) receiver type compound engine
খ) Tandem type compound engine
গ) Woolf type compound engine
ঘ) both (a) and (b)
০৪। A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called
ক) receiver type compound engine
খ) Tandem type compound engine
গ) Woolf type compound engine
ঘ) none of these
০৫। A compound steam engine requires a heavier flywheel than simple steam engines.
ক) True
খ) False
০৬। A condenser in a steam power plant
ক) increases expansion ratio of steam
খ) reduces back pressure of steam
গ) reduces temperature of exhaust steam
ঘ) all of these
০৭। 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.
ক) Agree
খ) Disagree
০৮। A condenser where circulating water flows through tubes which are surrounded by steam, in known as
ক) surface condenser
খ) jet condenser
গ) barometric condenser
ঘ) evaporative condenser
০৯। A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as
ক) superheater
খ) air preheater
গ) economiser
ঘ) injector
১০। A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as
ক) blow off cock
খ) fusible plug
গ) superheater
ঘ) stop valve
১১। 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.
ক) Yes
খ) No
১২। A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimny, is known as
ক) economiser
খ) fusible plug
গ) superheater
ঘ) stop valve
১৩। A device used to increase the temperature of saturated steam without raising its pressure, is called
ক) blow off cock
খ) fusible plug
গ) superheater
ঘ) stop valve
১৪। A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called
ক) blow off cock
খ) stop valve
গ) superheater
ঘ) none of these
১৫। A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly
ক) 1.05
খ) 2.86
গ) 6.65
ঘ) 10.05
১৬। A draught produced by a chimney due to the difference of densities between the hot gases inside the chimney and cold atmospheric air outside it, is called natural draught.
ক) Yes
খ) No
১৭। A good steam boiler is one which produces maximum quantity of steam with the given fuel
ক) Agree
খ) Disagree
১৮। A grate, in a boiler, is a place in the combustion chamber upon which fuel (wood or coal) is burnt.
ক) True
খ) False
১৯। A receiver type compound engine, requires a lighter flywheel.