Steam Boilers, Engines, Nozzles And Turbines MCQs

Option A: diverge from left to right

Option B: diverge from right to left

Option C: are equally spaced throughout

Option D: first rise up and then fall

Correct Answer: diverge from left to right ✔

Option A: 78-81%

Option B: 81-85%

Option C: 85-90%

Option D: 90-95%

Correct Answer: 78-81% ✔

Option A: boil

Option B: flash i.e. get converted into steam

Option C: remain as it was

Option D: cool down

Correct Answer: flash i.e. get converted into steam ✔

Option A: steam temperature remaisn constant

Option B: steam pressure remains constant

Option C: steam enthalpy remains constant

Option D: steam entropy remains constant

Correct Answer: steam enthalpy remains constant ✔

Option A: below atmospheric pressure

Option B: 1 kg/cm2

Option C: 100 kg/cm2

Option D: 170 kg/cm2

Correct Answer: 225.6 kg/cm2 ✔

Option A: remains same

Option B: increases

Option C: decreases

Option D: behaves unpredictably

Correct Answer: decreases ✔

Option A: 0.1 kg/cm2

Option B: 1 kg/cm2

Option C: 100 kg/cm2

Option D: 225.6 kg/cm2

Correct Answer: 225.6 kg/cm2 ✔

Option A: remains constant

Option B: increases

Option C: decreases

Option D: behaves unpredictably

Correct Answer: remains constant ✔

Option A: essentially an isentropic process

Option B: non-heat transfer process

Option C: reversible process

Option D: constant temperature process

Correct Answer: non-heat transfer process ✔

Option A: latent heat is zero

Option B: liquid directly becomes steam

Option C: specific volume of steam and liquid is same

Option D: this is the maximum pressure limit

Correct Answer: this is the maximum pressure limit ✔

Option A: 421 kgm

Option B: 421 kgm

Option C: 539 kgm

Option D: 102 kgm

Correct Answer: 421 kgm ✔

Option A: evaporative capacity

Option B: factor of evaporation

Option C: equivalent evaporation

Option D: one boiler h.p.

Correct Answer: one boiler h.p. ✔

Option A: heat transfer takes place across cylinder walls

Option B: work is done

Option C: steam may be wet, dry or superheated after expansion

Option D: all of the above

Correct Answer: all of the above ✔

Option A: horizontal fire-tube boiler

Option B: horizontal water-tube boiler

Option C: veritcal water-tube boiler

Option D: vertical fire tube boiler

Correct Answer: vertical fire tube boiler ✔

Option A: gravimetric analysis of the flue gases

Option B: volumetric analysis of the flue gases

Option C: mass flow of the flue gases

Option D: measuring smoke density of flue gases

Correct Answer: volumetric analysis of the flue gases ✔

Option A: equal to carnot cycle

Option B: less than carnot cycle

Option C: more than carnot cycle

Option D: could be anything

Correct Answer: less than carnot cycle ✔

Option A: stationary fire tube boiler

Option B: stationary water tube boiler

Option C: water tube boiler with natural/forced circulation

Option D: mobile fire tube boiler

Correct Answer: stationary fire tube boiler ✔

Option A: 1000 J

Option B: 360 kJ

Option C: 3600 kJ

Option D: 3600 kW/sec

Correct Answer: 3600 kJ ✔

Option A: frictional losses

Option B: it is not possible to achieve 0°K temperature

Option C: leakage

Option D: non-availability of ideal substance

Correct Answer: it is not possible to achieve 0°K temperature ✔

Option A: one half

Option B: one third

Option C: one-fifth

Option D: two-fifth

Correct Answer: one half ✔

Option A: work done during the rankine cycle ;

Option B: work done during compression.

Option C: work done during adiabatic expansion

Option D: change in enthalpy

Correct Answer: work done during the rankine cycle ; ✔

Option A: horizontal multitubular water tube boiler

Option B: water wall enclosed furnace type

Option C: vertical tubular fire tube type

Option D: horizontal multi-tubular fire tube type

Correct Answer: horizontal multi-tubular fire tube type ✔

Option A: flue gases pass through tubes and water around it

Option B: water passes through the tubes and flue gases around it

Option C: forced circulation takes place

Option D: tubes are laid vertically

Correct Answer: flue gases pass through tubes and water around it ✔

Option A: zero

Option B: one

Option C: two

Option D: four

Correct Answer: two ✔

Option A: locomotive boiler

Option B: Cochran boiler

Option C: Cornish boiler

Option D: Babcock and Wilcox boiler

Correct Answer: Babcock and Wilcox boiler ✔

Option A: supplied by same manufacturer loose and assembled at site

Option B: supplied mounted on a single base

Option C: purchased from several parties and packed together at site

Option D: packaged boiler does not exist

Correct Answer: supplied mounted on a single base ✔

Option A: anthracite coal

Option B: bituminous coal

Option C: lignite

Option D: peat

Correct Answer: anthracite coal ✔

Option A: give maximum space

Option B: give maximum strength

Option C: withstand pressure inside boiler ,

Option D: resist intense heat in fire box

Correct Answer: resist intense heat in fire box ✔

Option A: horizontal

Option B: vertical

Option C: inclined

Option D: both horizontal and vertical

Correct Answer: horizontal ✔

Option A: serve as storage of steam

Option B: serve as storage of feed water for water wall

Option C: remove salts from water

Option D: separate steam from water

Correct Answer: separate steam from water ✔

Option A: create vacuum in furnace

Option B: create vacuum at turbine exhaust

Option C: pump feed water

Option D: dose chemicals in feed water

Correct Answer: pump feed water ✔

Option A: more

Option B: less

Option C: same

Option D: could be more or less depending on other factors

Correct Answer: more ✔

Option A: horizontal

Option B: vertical

Option C: inclined

Option D: horizontal and inclined

Correct Answer: inclined ✔

Option A: 47.5 mm, 130 mm

Option B: 32.5 mm, 180 mm

Option C: 65.5 mm, 210 mm

Option D: 24.5 mm, 65 mm

Correct Answer: 47.5 mm, 130 mm ✔

Option A: cornish is fire tube and lancashire is water tube

Option B: cornish is water tube and lancashire is fire tube

Option C: cornish has two fire tubes and lancashire has one

Option D: lancashire has two fire tubes and cornish has one

Correct Answer: lancashire has two fire tubes and cornish has one ✔

Option A: atmospheric temperature

Option B: 500-600°C

Option C: 70O-850°C

Option D: 95O-1100°C

Correct Answer: 95O-1100°C ✔

Option A: cement industry

Option B: thermal power plant

Option C: blast furnace

Option D: domestic use

Correct Answer: blast furnace ✔

Option A: multitubular

Option B: horizontal

Option C: internally fired

Option D: mobile

Correct Answer: all of the above ✔

Option A: non-coking bituminous coal

Option B: brown coal

Option C: peat

Option D: coking bituminous coal

Correct Answer: none of the above ✔

Option A: DIN

Option B: BS

Option C: ASTM

Option D: IBR

Correct Answer: IBR ✔

Option A: babcock and wilcox

Option B: locomotive

Option C: lancashire

Option D: cochran

Correct Answer: locomotive ✔

Option A: 1.5 m, 4 m

Option B: 1.5 m, 6 m

Option C: 1 m, 4 m

Option D: 2 m, 4 m

Correct Answer: 1.5 m, 4 m ✔

Option A: 1 kg/cm2

Option B: 5 kg/cm2

Option C: 10 kg/cm2

Option D: 18 kg/cm2

Correct Answer: 18 kg/cm2 ✔

Option 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

Option B: water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

Option C: feed pump is employed to supplement natural circulation in water wall type furnace

Option D: water is converted into steam in one . pass without any recirculation

Correct Answer: 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 ✔

Option A: centrifugal pump

Option B: axial flow pump

Option C: gear pump

Option D: ejector pump

Correct Answer: reciprocating pump ✔

Option A: one-half

Option B: one-third

Option C: one-fourth

Option D: one-fifth

Correct Answer: two-fifth ✔

Option A: non-coking bituminous coal

Option B: brown coal

Option C: pulverised coal

Option D: coking bituminous coal

Correct Answer: non-coking bituminous coal ✔

Option A: atmospheric pressure

Option B: 5 kg/cm2

Option C: 10 kg/cm2

Option D: 40 kg/cm2

Correct Answer: 75-80 kg/cm2 ✔

Option A: 30 MW

Option B: 60 MW

Option C: 100 MW

Option D: 210 MW

Correct Answer: 500 MW ✔

Option A: 1 tp 1.25m

Option B: 1 to 1.75 m

Option C: 2 to 4 m

Option D: 1.75 to 2.75 m

Correct Answer: 1.75 to 2.75 m ✔

Option A: locomotive boiler

Option B: Babcock and Wilcox boiler

Option C: Stirling boiler.

Option D: all of the above

Correct Answer: locomotive boiler ✔

Option A: ash

Option B: volatile matter

Option C: moisture

Option D: hydrogen

Correct Answer: ash ✔

Option A: stationary<fire tube-type

Option B: horizontal type

Option C: natural cirulation type

Option D: internally fired type

Correct Answer: all of the above ✔

Option A: flue gases pass through tubes and water around it

Option B: water passes through the tubes and flue gases around it

Option C: work is done during adiabatic expansion

Option D: change in enthalpy

Correct Answer: work is done during adiabatic expansion ✔

Option A: carnot cycle

Option B: joule cycle

Option C: Stirling cycle

Option D: brayton cycle

Correct Answer: brayton cycle ✔

Option A: 2-4 m

Option B: 3-5 m

Option C: 5-7.5 m

Option D: 7-9 m

Correct Answer: 5-7.5 m ✔

Option A: 1 kg

Option B: 4/3kg

Option C: 8/3kg

Option D: 2 kg

Correct Answer: 4/3kg ✔

Option A: producer gas

Option B: coal gas

Option C: water gas

Option D: blast furnace gas

Correct Answer: coal gas ✔

Option A: regeneration

Option B: reheating of steam

Option C: both A. and B.

Option D: cooling of steam

Correct Answer: C. both A. and B. ✔

Option A: decreasing initial steam pressure and temperature

Option B: increasing exhaust pressure

Option C: decreasing exhaust pressure

Option D: increasing the expansion ratio

Correct Answer: decreasing initial steam pressure and temperature ✔

Option A: C02

Option B: CO

Option C: 02

Option D: N2

Correct Answer: 02 ✔

Option A: Hygroscopic substances

Option B: water vapour in air

Option C: temperature of air

Option D: pressure of air

Correct Answer: water vapour in air ✔

Option A: lowers the boiling point of a liquid

Option B: raises the boiling point of a liquid

Option C: .does not affect the boiling point of a liquid

Option D: reduces its volume

Correct Answer: raises the boiling point of a liquid ✔

Option A: and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2

Option B: and its corresponding conversion into dry steam at desired boiler pressure

Option C: conversion into steam at atmospheric condition

Option D: conversion into steam at the same pres-sure at which feed water is supplied

Correct Answer: and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2 ✔

Option A: equals that of the surroundings

Option B: equals 760 mm of mercury

Option C: equals to atmospheric pressure

Option D: equals the pressure of water in the container

Correct Answer: equals that of the surroundings ✔

Option A: pressure alone

Option B: temperature alone

Option C: pressure and temperature

Option D: pressure and dryness fraction

Correct Answer: pressure and dryness fraction ✔

Option A: volume

Option B: pressure

Option C: entropy

Option D: enthalpy

Correct Answer: pressure ✔

Option A: 40%

Option B: 25%

Option C: 50%

Option D: 80%

Correct Answer: 80% ✔

Option A: maximum

Option B: minimum

Option C: zero

Option D: depends on temperature also

Correct Answer: zero ✔

Option A: 539 kcal/kg

Option B: 539 BTU/lb

Option C: 427 kcal/kg

Option D: 100 kcal/kg

Correct Answer: 539 kcal/kg ✔

Option A: heat transfer takes place

Option B: work is done by the expanding steam

Option C: internal energy of steam changes

Option D: all of the above

Correct Answer: none of the above ✔

Option A: wet

Option B: superheated

Option C: remain dry saturated

Option D: dry

Correct Answer: wet ✔

Option A: wet

Option B: superheated

Option C: remain dry satruated

Option D: dry

Correct Answer: superheated ✔

Option A: horizontal straight line

Option B: vertical straight line

Option C: straight inclined line

Option D: curved line

Correct Answer: horizontal straight line ✔

Option A: pressure only

Option B: temperature only

Option C: dryness fraction only

Option D: specific volume only

Correct Answer: pressure and dryness fraction ✔

Option A: 0.1

Option B: 0.3

Option C: 0.5

Option D: 0.8

Correct Answer: 0.5 ✔

Option A: 0.2

Option B: 0.8

Option C: 1.0

Option D: 0.6

Correct Answer: 0.8 ✔

Option A: solid and vapour phases are in equi-librium

Option B: solid and liquid phases are in equilibrium

Option C: liquid and vapour phases are in equilibrium

Option D: solid, liquid and vapour phases are in equilibrium

Correct Answer: solid and vapour phases are in equi-librium ✔

Option A: the given boiler with the model

Option B: the two different boilers of the same make

Option C: two different makes of boilers operat¬ing under the same operating conditions

Option D: two boilers of same make but operaing under different conditions

Correct Answer: any type of boilers operating under any conditions ✔

Option A: 0°C

Option B: 100°C

Option C: saturation temperature at given pressure

Option D: room temperature

Correct Answer: 0°C ✔

Option A: 9.81 Joules

Option B: All Joules

Option C: 427 Joules

Option D: 102 Joules

Correct Answer: 9.81 Joules ✔

Option A: pulverising coal in inert atmosphere

Option B: heating wood in a limited supply of air at temperatures below 300GC

Option C: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Option D: binding the pulverised coal into brick-etts

Correct Answer: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel ✔

Option A: 225.65 kgf/cm2

Option B: 273 kgf/cm2

Option C: 100 kgf/cm2

Option D: 1 kgf/cm2

Correct Answer: 225.65 kgf/cm2 ✔

Option A: melting point rises slightly and boiling point drops markedly

Option B: melting point rises markedly and boiling point drops markedly

Option C: melting point drops slightly and boiling point drops markedly

Option D: melting point drops slightly and boiling point drops slightly

Correct Answer: melting point rises slightly and boiling point drops markedly ✔

Option A: linearly

Option B: rapidly first and then slowly

Option C: slowly first and then rapidly

Option D: inversely

Correct Answer: rapidly first and then slowly ✔

Option A: constant volume

Option B: constant temperature

Option C: constant pressure

Option D: constant entropy

Correct Answer: constant pressure ✔

Option A: air present in atmosphere at NTP conditions

Option B: air required for complete combustion of fuel with no excess air

Option C: air required for optimum combustion so as to have reasonable excess air

Option D: air required to convert CO into C02

Correct Answer: air required for complete combustion of fuel with no excess air ✔

Option A: 0.1 to 0.2 kg

Option B: 0.2 to 0.4 kg

Option C: 0.6 to 0.8 kg

Option D: 1.0 to 1.5 kg

Correct Answer: 0.6 to 0.8 kg ✔

Option A: linearly

Option B: slowly first and then rapidly

Option C: rapidly first and then slowly

Option D: inversely

Correct Answer: rapidly first and then slowly ✔

Option A: Ps-Pa

Option B: pa-ps

Option C: Pa+P

Option D: non of these

Correct Answer: Pa+P ✔

Option A: enthalpy

Option B: superheating

Option C: supersaturation

Option D: latent heat

Correct Answer: superheating ✔

Option A: pulverising coal in inert atmosphere

Option B: heating wood in a limited supply of air at temperatures below 300°C

Option C: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Option D: binding the pulverised coal into brick-ettes

Correct Answer: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel ✔

Option A: less

Option B: more

Option C: equal

Option D: may be less or more depending on temperature

Correct Answer: less ✔

Option A: 373°K

Option B: 273.16°K

Option C: 303°K

Option D: 0°K.

Correct Answer: 273.16°K ✔