The maximum discharge of steam through a convergent-divergent nozzle depends upon

Initial pressure and volume of steam

Final pressure of steam leaving the nozzle

The nozzle efficiency is the ratio of

Workdone on the blades to the energy supplied to the blades

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

The diagram efficiency is the ratio of

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades to the energy supplied to the blades

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

Bomb calorimeter is used to determine

Lower calorific value at constant volume

Higher calorific value at constant volume

Lower calorific value at constant volume

Higher calorific value at constant pressure

Lower calorific value at constant pressure

Which of the following statement is correct for a compound steam engine?

The temperature range per cylinder is increased, with corresponding increase in condensation

The cost of the engine, for the same power and economy, is more than that of a simple steam engine

The forces in the working parts are increased as the forces are distributed over more parts

The ratio of expansion is reduced, thus reducing the length of stroke

The temperature range per cylinder is increased, with corresponding increase in condensation

In an ideal impulse turbine, the

Axial velocity at inlet is equal to that at the outlet

Absolute velocity at the inlet of moving blade is equal to that at the outlet

Relative velocity at the inlet of the moving blade is equal to that at the outlet

Axial velocity at inlet is equal to that at the outlet

Whirl velocity at inlet is equal to that at the outlet

Cut-off governing as compared to throttle governing is

Less efficient and less economical

Less efficient and more economical

More efficient and less economical

More efficient and more economical

Water boils when its vapor pressure

Equals that of the surroundings

Equals the pressure of water in the container

The missing quantity per stroke is equal to

Cylinder feed + indicated mass of steam

Cylinder feed indicated mass of steam

Cylinder feed + indicated mass of steam

Mass of cushion steam + indicated mass of steam

Mass of cushion steam + cylinder feed

In forced recirculation type boiler,

Water is converted into steam in one pass without any recirculation

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

Feed pump is employed to supplement natural circulation in water wall type furnace

Water is converted into steam in one pass without any recirculation

In natural circulation type boiler,

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

Feed pump is employed to supplement natural circulation in water wall type furnace

Water is converted into steam in one. Pass without any recirculation

In a single acting steam engine

The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft

Over fire burning is the phenomenon of

Burning CO and unburnt in upper zone of furnace by supplying more air

In a reaction turbine, when steam flows through the fixed blades,

Pressure and velocity both decreases

Pressure increases while velocity decreases

Pressure decreases while velocity increases

Pressure and velocity both decreases

Pressure and velocity both increases

The function of injector used in small steam plants is to

Create vacuum at turbine exhaust

Reheating of steam in a turbine

Increases the work-done through the turbine

Increases the efficiency of the turbine

The number of drums in Benson steam generator is

One steam drum and one water drum

564 + Mcqs in Steam Boilers and Engines in Automobile Engineering Page 3 McqOptions

101.	The variation of steam pressure in the nozzle depends upon
A.	Velocity of steam
B.	Specific volume of steam
C.	Dryness fraction of steam
D.	All of these
Answer» E.

102.	The maximum discharge of steam through a convergent-divergent nozzle depends upon
A.	Area of nozzle at throat
B.	Initial pressure and volume of steam
C.	Final pressure of steam leaving the nozzle
D.	Both (A) and (B)
Answer» E.

103.	The actual power generated in the engine cylinder is called
A.	Indicated power
B.	Brake power
C.	Frictional power
D.	None of these
Answer» B. Brake power

104.	Efficiency of a thermal cycle increases by
A.	Regeneration
B.	Reheating of steam
C.	Both (A) and (B)
D.	Cooling of steam
Answer» D. Cooling of steam

105.	The specific heat of superheated steam in kcal/kg is generally of the order of
A.	0.1
B.	0.3
C.	0.5
D.	0.8
Answer» D. 0.8

106.	The nozzle efficiency is the ratio of
A.	Workdone on the blades to the energy supplied to the blades
B.	Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
C.	Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
D.	None of the above
Answer» D. None of the above

107.	The diagram efficiency is the ratio of
A.	Workdone on the blades to the energy supplied to the blades
B.	Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
C.	Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
D.	None of the above
Answer» B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

108.	For combustion of a fuel, following is essential
A.	Correct fuel air ratio
B.	Proper ignition temperature
C.	O₂ to support combustion
D.	All the three above
Answer» E.

109.	The water tubes in a Babcock and Wilcox boiler are
A.	Horizontal
B.	Vertical
C.	Inclined
D.	Horizontal and inclined
Answer» D. Horizontal and inclined

110.	The pressure at which latent heat of vaporisation of water is zero, is
A.	Below atmospheric pressure
B.	1 kg/cm²
C.	100 kg/cm²
D.	225.6 kg/cm²
Answer» E.

111.	Which device is used in thermal power plants to reduce level of pollution?
A.	Induced draft fan
B.	Smoke meter
C.	Chimney
D.	Precipitator
Answer» E.

112.	The high steam and low water safety valve is not used in
A.	Cochran boiler
B.	Cornish boiler
C.	Lancashire boiler
D.	Locomotive boiler
Answer» E.

117.	Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)
A.	I.P. = a × m + b
B.	m = a + b × I.P.
C.	I.P. = b × m + a
D.	m = (b/I.P.) - a
Answer» C. I.P. = b × m + a

120.	The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as
A.	Efficiency of the boiler
B.	Efficiency of the chimney
C.	Efficiency of the fan
D.	Power of the boiler
Answer» C. Efficiency of the fan

121.	A boiler in India should conform to safety regulations of
A.	DIN
B.	BS
C.	ASTM
D.	IBR
Answer» E.

113.	Bomb calorimeter is used to determine
A.	Higher calorific value at constant volume
B.	Lower calorific value at constant volume
C.	Higher calorific value at constant pressure
D.	Lower calorific value at constant pressure
Answer» B. Lower calorific value at constant volume

114.	In locomotive boiler, maximum steam pressure is limited to
A.	1 kg/cm²
B.	5 kg/cm²
C.	10 kg/cm²
D.	18 kg/cm²
Answer» E.

115.	The turbine blades are
A.	Straight
B.	Circular
C.	Curved
D.	None of these
Answer» D. None of these

116.	Which of the following statement is correct for a compound steam engine?
A.	The cost of the engine, for the same power and economy, is more than that of a simple steam engine
B.	The forces in the working parts are increased as the forces are distributed over more parts
C.	The ratio of expansion is reduced, thus reducing the length of stroke
D.	The temperature range per cylinder is increased, with corresponding increase in condensation
Answer» D. The temperature range per cylinder is increased, with corresponding increase in condensation

118.	In an ideal impulse turbine, the
A.	Absolute velocity at the inlet of moving blade is equal to that at the outlet
B.	Relative velocity at the inlet of the moving blade is equal to that at the outlet
C.	Axial velocity at inlet is equal to that at the outlet
D.	Whirl velocity at inlet is equal to that at the outlet
Answer» C. Axial velocity at inlet is equal to that at the outlet

119.	Which of the following boiler works on a forced circulation of water?
A.	Lamont boiler
B.	Benson boiler
C.	Loeffler boiler
D.	All of these
Answer» E.

122.	Cut-off governing as compared to throttle governing is
A.	Less efficient and less economical
B.	Less efficient and more economical
C.	More efficient and less economical
D.	More efficient and more economical
Answer» E.

123.	Water boils when its vapor pressure
A.	Equals that of the surroundings
B.	Equals 760 mm of mercury
C.	Equals to atmospheric pressure
D.	Equals the pressure of water in the container
Answer» B. Equals 760 mm of mercury

124.	The missing quantity per stroke is equal to
A.	Cylinder feed indicated mass of steam
B.	Cylinder feed + indicated mass of steam
C.	Mass of cushion steam + indicated mass of steam
D.	Mass of cushion steam + cylinder feed
Answer» B. Cylinder feed + indicated mass of steam

125.	In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.
A.	Equal to
B.	Less than
C.	Greater than
D.	None of these
Answer» B. Less than

Explore topic-wise MCQs in Automobile Engineering.

The variation of steam pressure in the nozzle depends upon

The maximum discharge of steam through a convergent-divergent nozzle depends upon

The actual power generated in the engine cylinder is called

Efficiency of a thermal cycle increases by

The specific heat of superheated steam in kcal/kg is generally of the order of

The nozzle efficiency is the ratio of

The diagram efficiency is the ratio of

For combustion of a fuel, following is essential

The water tubes in a Babcock and Wilcox boiler are

The pressure at which latent heat of vaporisation of water is zero, is

Which device is used in thermal power plants to reduce level of pollution?

The high steam and low water safety valve is not used in

Bomb calorimeter is used to determine

In locomotive boiler, maximum steam pressure is limited to

The turbine blades are

Which of the following statement is correct for a compound steam engine?

Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

In an ideal impulse turbine, the

Which of the following boiler works on a forced circulation of water?

The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

A boiler in India should conform to safety regulations of

Cut-off governing as compared to throttle governing is

Water boils when its vapor pressure

The missing quantity per stroke is equal to

In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.

A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as

In forced recirculation type boiler,

In natural circulation type boiler,

Willian’s line for the steam engine is a straight line relationship between the steam consumption per hour and

In a single acting steam engine

The pressure of steam __________ while flowing through a nozzle.

In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

Over fire burning is the phenomenon of

In a reaction turbine, when steam flows through the fixed blades,

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.

A wet vapor can be completely specified by

By compounding the expansion of steam in two or more cylinders, the length of stroke

The working pressure range for a LaMont boiler is

1 kg.m is equal to

The function of a cross-head is to guide motion of the _________ and to prevent it from bending.

The draught in locomotive boilers is produced by a

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

The function of injector used in small steam plants is to

If the critical pressure ratio for steam is 0.546, then the steam is initially

Reheating of steam in a turbine

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

The number of drums in Benson steam generator is

With increase in load, radiant superheater has

The ratio of total useful heat drop to the total isentropic heat drop, is called

126.	A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
A.	Back pressure turbine
B.	Pass out turbine
C.	Low pressure turbine
D.	Impulse turbine
Answer» C. Low pressure turbine

127.	In forced recirculation type boiler,
A.	Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B.	Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C.	Feed pump is employed to supplement natural circulation in water wall type furnace
D.	Water is converted into steam in one pass without any recirculation
Answer» D. Water is converted into steam in one pass without any recirculation

128.	In natural circulation type boiler,
A.	Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B.	Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C.	Feed pump is employed to supplement natural circulation in water wall type furnace
D.	Water is converted into steam in one. Pass without any recirculation
Answer» B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

129.	Willian’s line for the steam engine is a straight line relationship between the steam consumption per hour and
A.	Indicated power
B.	Brake power
C.	Efficiency
D.	Pressure of steam
Answer» B. Brake power

130.	In a single acting steam engine
A.	The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft
B.	The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
C.	The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft
D.	The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft
Answer» B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

131.	The pressure of steam __________ while flowing through a nozzle.
A.	Increases
B.	Decreases
C.	Remains constant
D.	None of these
Answer» C. Remains constant

132.	In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be
A.	160/3 m/s
B.	320/3 m/s
C.	640/3 m/s
D.	640 m/s
Answer» D. 640 m/s

133.	Over fire burning is the phenomenon of
A.	Supply of excess, air
B.	Supply of excess coal
C.	Burning CO and unburnt in upper zone of furnace by supplying more air
D.	Fuel bed firing
Answer» D. Fuel bed firing

134.	In a reaction turbine, when steam flows through the fixed 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
Answer» C. Pressure and velocity both decreases

135.	The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)
A.	T1 /88.25H
B.	88.25H/T1
C.	T1 /176.5H
D.	176.5H/T1
Answer» E.