The safety valve on boiler drum compared to safety valve on superheater is set at

ower/higher depending on steam flow

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

irst increases and then decreases

The ultimate analysis of fuel lists

uel constituents as percents by volume of moisture, volatile, fixed carbon and ash

arious chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

arious chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

uel constituents as percents by volume of moisture, volatile, fixed carbon and ash

uel constituents as percents by weight of moisture, volatile, fixed carbon and ash

The proximate analysis of fuel lists

arious chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

arious chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

uel constituents as percents by volume of moisture, volatile, fixed carbon and ash

uel constituents as percents by weight of moisture, volatile, fixed carbon and ash

Lancashire boiler is a

ater tube boiler with natural/forced circulation

Bomb calorimeter is used to determine

ower calorific value at constant volume

igher calorific value at constant volume

ower calorific value at constant volume

igher calorific value at constant pressure

ower calorific value at constant pressure

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

nitial pressure and volume of steam

inal pressure of steam leaving the nozzle

Boiler stays are used to

revent flat surfaces under pressure from tearing apart

ake care of failure in compression

In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

0°C and normal atmospheric pressure

00°C and normal atmospheric pressure

Vacuum for reciprocating steam engines compared to steam turbines is

ould be more or less depending on the size of plant

A condenser in a steam power plant

ncreases expansion ratio of steam

educes temperature of exhaust steam

The number of drums in Benson steam generator is

ne steam drum and one water drum

The function of injector used in small steam plants is to

reate vacuum at turbine exhaust

Over fire burning is the phenomenon of

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

In natural circulation type boiler,

ater 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

eating 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

ater 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

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

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

In a single acting steam engine

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

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

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

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

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

Water boils when its vapor pressure

quals the pressure of water in the container

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and ≈í¬± = Nozzle angle)%!

Vb = 0.5 V¬¨‚â§ cos≈í¬±

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 crown of the fire box is made hemispherical in order to%!

Withstand pressure inside boiler

Resist intense heat in fire box

760 + Mcqs in Steam Boilers, Engines, Nozzles And Turbines Page 5 McqOptions

201.	The safety valve on boiler drum compared to safety valve on superheater is set at
A.	ame value
B.	igher value
C.	ower value
D.	ower/higher depending on steam flow
Answer» C. ower value

202.	Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler
A.	ncreases
B.	ecreases
C.	emain unaffected
D.	irst increases and then decreases
Answer» C. emain unaffected

203.	The ultimate analysis of fuel lists
A.	arious chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
B.	arious chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
C.	uel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D.	uel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Answer» C. uel constituents as percents by volume of moisture, volatile, fixed carbon and ash

204.	The proximate analysis of fuel lists
A.	arious chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
B.	arious chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
C.	uel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D.	uel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Answer» E.

205.	Lancashire boiler is a
A.	tationary fire tube boiler
B.	tationary water tube boiler
C.	ater tube boiler with natural/forced circulation
D.	obile fire tube boiler
Answer» B. tationary water tube boiler

206.	The safety valve at superheater as compared to drum safety valve setting is set at
A.	igher value
B.	ower value
C.	ame value
D.	ny value
Answer» C. ame value

207.	The ratio of heat utilized to produce steam and the heat liberated in furnace is known as
A.	oiler effectiveness
B.	oiler evaporative capacity
C.	actor of evaporation
D.	oiler efficiency
Answer» E.

208.	Fire tube boilers are limited to a maximum design working pressure of
A.	kg/cm
B.	kg/cm
C.	7 kg/cm²
D.	00 kg/cm²
Answer» D. 00 kg/cm²

209.	Fire tube boilers are limited to a maximum working pressure of
A.	.17 MN/m²
B.	.7 MN/m²
C.	7 MN/m²
D.	70 MN/m²
Answer» C. 7 MN/m²

210.	The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)
A.	₁. p₂
B.	₁/p₂
C.	₂/p₁
D.	₁ + p₂
Answer» D. ₁ + p₂

211.	Bomb calorimeter is used to determine
A.	igher calorific value at constant volume
B.	ower calorific value at constant volume
C.	igher calorific value at constant pressure
D.	ower calorific value at constant pressure
Answer» B. ower calorific value at constant volume

213.	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.	.P. = a × m + b
B.	= a + b × I.P.
C.	.P. = b × m + a
D.	= (b/I.P.) - a
Answer» C. .P. = b × m + a

214.	For combustion of a fuel, following is essential
A.	orrect fuel air ratio
B.	roper ignition temperature
C.	₂ to support combustion
D.	ll the three above
Answer» E.

215.	The water tubes in a Babcock and Wilcox boiler are
A.	orizontal
B.	ertical
C.	nclined
D.	orizontal and inclined
Answer» D. orizontal and inclined

217.	The actual power generated in the engine cylinder is called
A.	ndicated power
B.	rake power
C.	rictional power
D.	one of these
Answer» B. rake power

212.	In locomotive boiler, maximum steam pressure is limited to
A.	kg/cm²
B.	kg/cm²
C.	0 kg/cm²
D.	8 kg/cm²
Answer» E.

216.	The pressure at which latent heat of vaporisation of water is zero, is
A.	elow atmospheric pressure
B.	kg/cm²
C.	00 kg/cm²
D.	25.6 kg/cm²
Answer» E.

218.	Efficiency of a thermal cycle increases by
A.	egeneration
B.	eheating of steam
C.	oth (A) and (B)
D.	ooling of steam
Answer» D. ooling of steam

219.	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

220.	Hard coke is produced by carburization of coal at
A.	tmospheric temperature
B.	00-600°C
C.	00-850°C
D.	50-1100°C
Answer» E.

221.	The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)
A.	in²α
B.	os²α
C.	an²α
D.	ot²α
Answer» C. an²α

222.	The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)
A.	b = 0.5 V cosα
B.	b = V cosα
C.	b = 0.5 V² cosα
D.	b = V² cosα
Answer» B. b = V cosα

223.	The maximum discharge of steam through a convergent-divergent nozzle depends upon
A.	rea of nozzle at throat
B.	nitial pressure and volume of steam
C.	inal pressure of steam leaving the nozzle
D.	oth (A) and (B)
Answer» E.

224.	In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine
A.	ancashire boiler
B.	ocomotive boiler
C.	abcock and Wilcox boiler
D.	enson boiler
Answer» C. abcock and Wilcox boiler

225.	Boiler stays are used to
A.	revent flat surfaces under pressure from tearing apart
B.	ake care of failure in shear
C.	ake care of failure in compression
D.	rovide support for boiler
Answer» B. ake care of failure in shear

Explore topic-wise MCQs in Mechanical Engineering.

The safety valve on boiler drum compared to safety valve on superheater is set at

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

The ultimate analysis of fuel lists

The proximate analysis of fuel lists

Lancashire boiler is a

The safety valve at superheater as compared to drum safety valve setting is set at

The ratio of heat utilized to produce steam and the heat liberated in furnace is known as

Fire tube boilers are limited to a maximum design working pressure of

Fire tube boilers are limited to a maximum working pressure of

The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

Bomb calorimeter is used to determine

In locomotive boiler, maximum steam pressure is limited to

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)

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

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

Hard coke is produced by carburization of coal at

The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

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

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

Boiler stays are used to

Latent heat of dry steam at atmospheric pressure is equal to

In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

Vacuum for reciprocating steam engines compared to steam turbines is

A condenser in a steam power plant

The number of drums in Benson steam generator is

With increase in load, radiant superheater has

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

Over fire burning is the phenomenon of

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)

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

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

Water boils when its vapor pressure

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.

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

The maximum efficiency of a De-Laval turbine is (where ≈í¬± = Nozzle angle)%!

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and ≈í¬± = Nozzle angle)%!

The variation of steam pressure in the nozzle depends upon%!

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

The saturation temperature of steam with increase in pressure increases%!

The crown of the fire box is made hemispherical in order to%!

The ratio of heat utilized to produce steam and the heat liberated in furnace is known as%!

226.	Latent heat of dry steam at atmospheric pressure is equal to
A.	39 kcal/ kg
B.	39 BTU/ lb
C.	27 kcal/ kg
D.	00 kcal/ kg
Answer» B. 39 BTU/ lb

227.	In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as
A.	0°C and normal atmospheric pressure
B.	0°C and 1.1 bar pressure
C.	00°C and normal atmospheric pressure
D.	00°C and 1.1 bar pressure
Answer» D. 00°C and 1.1 bar pressure

228.	Vacuum for reciprocating steam engines compared to steam turbines is
A.	ore
B.	qual
C.	ess
D.	ould be more or less depending on the size of plant
Answer» D. ould be more or less depending on the size of plant

229.	A condenser in a steam power plant
A.	ncreases expansion ratio of steam
B.	educes back pressure of steam
C.	educes temperature of exhaust steam
D.	ll of these
Answer» E.

230.	The number of drums in Benson steam generator is
A.	ne
B.	wo
C.	ne steam drum and one water drum
D.	o drum
Answer» E.

231.	With increase in load, radiant superheater has
A.	rooping characteristic
B.	inear characteristic
C.	ising characteristic
D.	lat characteristic
Answer» B. inear characteristic

232.	A condenser where circulating water flows through tubes which are surrounded by steam, in known as
A.	urface condenser
B.	et condenser
C.	arometric condenser
D.	vaporative condenser
Answer» B. et condenser

233.	The function of injector used in small steam plants is to
A.	reate vacuum in furnace
B.	reate vacuum at turbine exhaust
C.	ump feed water
D.	ose chemicals in feed water
Answer» D. ose chemicals in feed water

234.	Over fire burning is the phenomenon of
A.	upply of excess, air
B.	upply of excess coal
C.	urning CO and unburnt in upper zone of furnace by supplying more air
D.	uel bed firing
Answer» D. uel bed firing

235.	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.	1 /88.25H
B.	8.25H/T1
C.	1 /176.5H
D.	76.5H/T1
Answer» E.