In a reaction turbine, when steam flows through the moving blades,
A. Pressure increases while velocity decreases
B. Pressure decreases while velocity increases
C. Pressure and velocity both decreases
D. Pressure and velocity both increases
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In water wall furnace, the heat is transferred to the water walls by
A. Convection
B. Radiation
C. Conduction
D. Radiation and conduction
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The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
A. Less
B. More
C. Equal
D. May be less or more depending on temperature
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100% efficiency of a thermal cycle cannot be achieved because of
A. Frictional losses
B. It is not possible to achieve 0°K temperature
C. Leakage
D. Non availability of ideal substance
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Lancashire boiler is of
A. Stationary fire tube type
B. Horizontal type
C. Natural circulation type
D. All of the above
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The major axis of elliptical manholes on the shell should be provided
A. Longitudinally
B. Circumferentially
C. On dished end
D. Anywhere
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In a throttling process
A. Steam temperature remains constant
B. Steam pressure remains constant
C. Steam enthalpy remains constant
D. Steam entropy remains constant
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The object of producing draught in a boiler is
A. To provide an adequate supply of air for the fuel combustion
B. To exhaust the gases of combustion from the combustion chamber
C. To discharge the gases of combustion to the atmosphere through the chimney
D. All of the above
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The artificial draught is produced by
A. Steam jet
B. Centrifugal fan
C. Chimney
D. Both (A) and (B)
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The natural draught is produced by
A. Steam jet
B. Centrifugal fan
C. Chimney
D. Both (A) and (B)
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In locomotives, the draught is produced by
A. Chimney
B. Induced draft fan
C. Both combined (A) and (B)
D. Steam jet draught
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In designing air preheaters, the important design consideration is that
A. Approach temperature should be as low as possible
B. Handling and maintenance should be easier
C. Heat transfer area should be optimum
D. Stack gases should not be cooled to the dew point
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Which of the following are boiler accessories?
A. Economizer
B. Superheater
C. Both (A) and (B)
D. None of these
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The selection of type and size of a steam boiler depends upon
A. The power required and working pressure
B. The geographical position of the power house
C. The fuel and water available
D. All of the above
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An economiser is installed in a boiler primarily to
A. Superheat the steam
B. Reduce fuel consumption
C. Increase steam pressure
D. All of these
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A fusible plug is fitted in small boilers in order to
A. Avoid excessive build up of pressure
B. Avoid explosion
C. Extinguish fire if water level in the boiler falls below alarming limit
D. Control steam dome
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Presence of moisture in fuel oil would
A. Keep the burner tips cool
B. Aid in proper combustion
C. Because sputtering, possibly extinguishing flame
D. Clean the nozzles
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Which of the following varieties of coals is mostly used in steam boilers?
A. Non-coking bituminous coal
B. Brown coal
C. Peat
D. None of the above
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Steam turbines are used for
A. Large marine propulsion
B. Electric power generation
C. Direct drive of fans, compressors, pumps
D. All of these
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For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.
A. Equal to
B. Twice
C. Three times
D. Four times
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