Free Mechanical Engineering MCQs Mock Test Online with Answers

Q1 : Which of the following substance will have same percentage in both proximate and ultimate analysis___________________?

A: ash B: volatile matter C: moisture D: . hydrogen

Q2 : Boiler stays are used to___________________?

A: prevent flat surfaces under pressure from tearing apartprovide support for boiler B: take care of failure in shear C: take care of failure in compression D: provide support for boiler

Q3 : Steam exhaust from high pressure turbine is reheated in _____________________?

A: boiler drum B: superheater tubes C: economiser D: a separate coil located in convection path

Q4 : Which of the following is steam dbal?

A: non-coking bituminous coal B: brown coal C: coking bituminous coal D: none of the above

Q5 : In the case of steady flow of a fluid, the acceleration of any fluid particle is________________?

A: constant B: variable C: zero D: zero under limiting conditions

Q6 : In an immersed body, centre of pressure is __________________?

A: at the centre of gravity B: above the centre of gravity C: below be centre of gravity D: could be above or below e.g. depend¬ing on density of body and liquid

Q7 : 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

Q8 : The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?

A: wet B: superheated C: remain dry satruated D: none of the above

Q9 : On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?

A: horizontal straight line B: vertical straight line C: straight inclined line D: none of the above

Q10 : Diesel Cycle is also known as : __________?

A: Constant temperature cycle B: Constant Volume cycle C: Constant Pressure Cycle D: All of above

Q11 : Specific weight of sea water is more that of pure water because it contains_________________?

A: dissolved air B: dissolved salt C: suspended matter D: all of the above

Q12 : The pressure at which latent heat of vaporisation of water is zero, is_________________?

A: 225.6 kg/cm2 B: 1 kg/cm2 C: 100 kg/cm2 D: 170 kg/cm2

Q13 : The density of water is 1000 kg/m3 at__________________?

A: 0°C B: 0°K C: 4°C D. 20°C D: all temperature

Q14 : The efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio

A: Higher B: Lower C: Equal D: None of these

Q15 : In locomotives, the draught is produced by_________________?

A: chimney B: induced draft fan C: both combined A. and B. D: steam jet draught

Q16 : The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________?

A: one-half B: one-third C: one-fourth D: two-fifth

Q17 : Vacuum for reciprocating steam engines compared to steam turbines is__________________?

A: more B: equal C: less D: could be more or less depending on the size of plant

Q18 : At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?

A: maximum B: minimum C: zero D: depends on temperature also

Q19 : Center of pressure on an inclined plane is___________________?

A: at the centroid B: above the centroid C: below the centroid D: at metacentre

Q20 : The function of injector used in small steam plants is to________________?

A: create vacuum in furnace B: create vacuum at turbine exhaust C: pump feed water D: dose chemicals in feed water

Q21 : Pour point of fuel oil is the____________________?

A: lowest temperature at which oil will flow under set condition B: storage temperature C: temperature at which fuel is pumped through burners D: lowest temperature at which oil will flow under set condition

Q22 : The natural solid fuels are : ________?

A: Wood B: Peat C: Peat D: All of above

Q23 : The basic job of feed water treatment in boilers is to overcome the problem of __________________?

A: corrosion B: scale C: carryover D: all of the above

Q24 : Property of a fluid by which its own molecules are attracted is called___________________?

A: adhesion B: cohesion C: viscosity D: compressibility

Q25 : The property of fluid by virtue of which it offers resistance to shear is called________________?

A: surface tension B: adhesion C: cohesion D: viscosity

Q26 : 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

Q27 : The lenght of Cornish boiler is of the order of _________________?

A: 2-4 m B: 3-5 m C: 5-7.5 m D: 7-9 m

Q28 : In a free vortex motion, the radial component of velocity everywhere is________________?

A: maximum B: minimum C: zero D: non-zero and finite

Q29 : If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by___________________?

A: throttling calorimeter B: separating calorimeter C: combined separating and throttling calorimeter D: bucket calorimeter

Q30 : During the opening of a valve in a pipe line, the flow is_________________?

A: steady B: unsteady C: uniform D: free vortex type

Q31 : Boiler stays are used to___________________?

A: prevent flat surfaces under pressure from tearing apart B: take care of failure in shear C: take care of failure in compression D: provide support for boiler

Q32 : Choose the wrong statement ?

A: The center of buoyancy is located at the center of gravity of the displaced liquid B. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy B: If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions C: For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy D: All floating bodies are stable

Q33 : The heat loss in a boiler takes place in the form of________________?

A: heat carried away by flue gases B: heat carried away by ash C: moisture present in fuel and steam formed by combustion of hydrogen in fuel D: all of the above

Q34 : The specific volume of steam with increase in pressure decreases_____________________?

A: linearly B: slowly first and then rapidly C: rapidly first and then slowly D: inversely

Q35 : The number of flue tubes in Lancashire boiler is_________________?

A: zero B: one C: two D: four

Q36 : A wet vapour can be completely specified by__________________?

A: pressure only B: temperature only C: dryness fraction only D: pressure and dryness fraction

Q37 : Density of water is maximum at__________________?

A: 0°C B: 0°K C: 4°C D: 4°C

Q38 : Pressure of the order of 10″‘ torr can be measured by__________________?

A: Bourdon tube B: Pirani Gauge C: micro-manometer D: ionisastion gauge

Q39 : The part of the coupling that actually transmits power and rotation from one shaft to the other shaft is_________?

A: gap B: hub C: key D: driver

Q40 : On Mollier chart, flow through turbine is represented by ________________?

A: horizontal straight line B: vertical straight line C: straight inclined line D: curved line

Q41 : The proximate analysis of fuel lists__________________?

A: various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume B: various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight C: fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash D: fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

Q42 : Units of surface tension are____________________?

A: energy/unit area B: distance C: both of the above D: it has no units

Q43 : A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

A: 1 : 5 B: 1 : 2.5 C: 1 :25 D: 1:V5″

Q44 : In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?

A: lancashire boiler B: locomotive boiler C: babcock and wilcox boiler D: cochran boiler

Q45 : Which of the following are used in diesel engines and oil fired boilers :

A: Paraffin B: Gasoline C: Heavy fuel oils D: Patrol

Q46 : Which of the following coals has the highest calorific value_________________?

A: anthracite coal B: bituminous coal C: lignite D: peat

Q47 : Fire tube boilers are those in which__________________?

A: flue gases pass through tubes and water around it B: water passes through the tubes and flue gases around it C: forced circulation takes place D: tubes are laid vertically

Q48 : Hygrometery deals with the_________________?

A: Hygroscopic substances B: water vapour in air C: temperature of air D: pressure of air

Q49 : The number of drums in Benson steam generator is_________________?

A: one B: two C: one steam drum and one water drum D: no drum

Q50 : One kilowatt-hour energy is equivalent to ________________?

A: 1000 J B: 360 kJ C: 3600 kJ D: 3600 kW/sec

Q51 : Which of the following gases has the highest calorific value ________________?

A: producer gas B: coal gas C: water gas D: blast furnace gas

Q52 : Practical fluids___________________?

A: are viscous B: . possess surface tension C: are compressible D: possess all the above properties

Q53 : Reheating of steam under ideal conditions takes place at constant __________________?

A: entropy B: enthaply C: pressure D: temperature

Q54 : The latent heat of steam with increase of pressure__________________?

A: remains same B: increases C: decreases D: behaves unpredictably

Q55 : The flow which neglects changes in a transverse direction is known as_________________?

A: one dimensional flow B: uniform flow C: steady flow D: turbulent flow

Q56 : For water, at pressures below atmospheric___________________?

A: melting point rises slightly and boiling point drops markedly B: melting point rises markedly and boiling point drops markedly C: melting point drops slightly and boiling point drops markedly D: melting point drops slightly and boiling point drops slightly

Q57 : The condition of steam in boiler drum is always ___________________?

A: dry B: wet C: saturated D: supersaturated

Q58 : The safety valve on boiler drum compared to safety valve on super heater is set at ________________?

A: same value B: higher value C: lower value D: lower/higher depending on steam flow

Q59 : Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?

A: former generates steam at high pressure B: former occupies less space for same power C: rate of steam flow is more in former case D: chances of explosion are less in former case

Q60 : Choose the wrong statement ?

A: any weight, floating or immersed in a liquid, is acted upon by a buoyant force B: Buoyant force is equal to the weight of the liquid displaced C: The point through which buoyant force acts, is called the center of buoyancy D: Center of buoyancy is located above the center of gravity of the displaced liquid v

Q61 : The process of diffusion of one liquid into the other through a semi-permeable membrane is called_______________________?

A: viscosity B: osmosis C: diffusivity D: surface tension

Q62 : Sublimation region is the region where__________________?

A: solid and vapour phases are in equi-librium B: solid and liquid phases are in equilibrium C: liquid and vapour phases are in equilibrium D: solid, liquid and vapour phases are in equilibrium

Q63 : The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________?

A: 1000 B: 2100 C: 2700 D: 21,000

Q64 : The ratio of heat utilised to produce steam and the heat liberated in furnace is known as___________________?

A: boiler effectiveness B: boiler evaporative capacity C: factor of evaporation D: . boiler efficiency

Q65 : The high pressure boiler is oiie producing steam at a pressure more than_________________?

A: atmospheric pressure B: 5 kg/cm2 C: 10 kg/cm2 D: 75-80 kg/cm2

Q66 : Latent heat of dry steam at atmospneric pressure is equal to____________________?

A: 539 kcal/kg B: 539 BTU/lb C: 427 kcal/kg D: 100 kcal/kg

Q67 : Coke is produced by__________________?

A: pulverising coal in inert atmosphere B: heating wood in a limited supply of air at temperatures below 300GC C: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel D: binding the pulverised coal into brick-etts

Q68 : Which of the following solid fuel has high carbon content?

A: Coke B: Coal C: Peat D: None of these

Q69 : Lancashire ‘boiler is a__________________?

A: stationary fire tube boiler B: stationary water tube boiler C: water tube boiler with natural/forced circulation D: mobile fire tube boiler

Q70 : The average calorific value of wood is about : __________?

A: 33500 kj/kg B: 25000 kj/kg C: 23000 kj/kg D: 19700 kj/kg

Q71 : In a throttling process_________________?

A: heat transfer takes place B: work is done by the expanding steam C: internal energy of steam changes D: none of the above

Q72 : In regenerative air preheater, the heat is transferred _____________________?

A: from a metal wall from one medium to another B: from heating an intermediateanaterial and then heating the air from this materia C: by direct mixing D: heat is transferred by bleeding some gas from furnace

Q73 : Spontaneous combustion is a phenomenon in which____________________?

A: all the fuel burns instantaneously producing high energy release B: fuel burns with less air C: coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal D: explosion in furnace

Q74 : The increase in pressure _________________?

A: lowers the boiling point of a liquid B: raises the boiling point of a liquid C: .does not affect the boiling point of a liquid D: reduces its volume

Q75 : In a throttling process________________?

A: steam temperature remaisn constant B: steam pressure remains constant C: steam enthalpy remains constant D: steam entropy remains constant

Q76 : Fluid is a substance that___________________?

A: cannot be subjected to shear forces B: always expands until it fills any container C: has the same shear stress.at a point regardless of its motion D: cannot remain at rest under action of any shear force

Q77 : Which of the following solid fuel has high caloric value : ___________?

A: Wood B: Peat C: Bituminous coal D: Anthracite coal

Q78 : Which of the following is a fire tube boiler________________?

A: locomotive boiler B: Babcock and Wilcox boiler C: Stirling boiler. D: all of the above

Q79 : The water tubes in a babcock and wilcox boiler are__________________?

A: horizontal B: vertical C: inclined D: horizontal and inclined

Q80 : Fusible plug for boilers is made of fusible metal containing tin, lead, and___________________?

A: bismuth B: copper C: aluminium D: nickel

Q81 : The buoyancy depends on___________________?

A: mass of liquid displaced B: viscosity of the liquid C: pressure of the liquid displaced D: depth of immersion

Q82 : Surface energy per unit area of a surface is numerically equal to _____________________?

A: atmospheric pressure B: surface tension C: force of adhesion D: force of cohesion

Q83 : The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?

A: 0.1 to 0.2 kg B: 0.2 to 0.4 kg C: 0.6 to 0.8 kg D: 1.0 to 1.5 kg

Q84 : The patrol is distilled at a temperature from :

A: 6° to 20° B: 6° to 20° C: 65° to 220° D: 15° to 120°

Q85 : It is required to produce large amount of steam at low pressure. Which boiler should be used ?

A: pulverised fuel fired boiler B: cochran boiler C: lancashire boiler D: lancashire boiler

Q86 : Ultimate analysis of fuel is determination of percentage of____________________?

A: carbon, hydrogen, nitrogen, sulphur, moisture B: . fixed carbon, ash, volatile matter, moisture C: higher calorific value D: best analysis

Q87 : The major axis of elliptical manholes on the shell should be provided___________________?

A: longitudinally B: circumferentially C: on dished end D: anywhere

Q88 : The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if___________________?

A: the area is horizontal B: the area is vertical C: the area is inclined D: all of the above

Q89 : The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be __________________?

A: 2 metres of water column B: 3 metres of water column C: 3.5 metres of water column D: 4 m of water column

Q90 : Choose the wrong statement?

A: Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force B: Viscosity is due primarily to interaction between fluid molecules C: Viscosity of liquids decreases with in-crease in temperature D: Viscosity of liquids is appreciably affected by change in pressure

Q91 : Calorific value of coal is of the order of _______________________?

A: 200-400 kcal/kg B: 800-1200 kcal/kg C: 2000-4000 kcal/kg D: 5000-8000 kcal/kg

Q92 : The biggest size of thermal power unit operating in India is ________________?

A: 30 MW B: 60 MW C: 100 MW D: 500 MW

Q93 : Water boils when its vapour 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

Q94 : The difference of pressure between the inside and outside of a liquid drop is _______________?

A: p = Txr B: p = T/r C: p = T/2r D: p = 2T/r

Q95 : Water and sediment in fuel oil can be removed by _______________________?

A: heating the oil in the settling tanks B: cooling the oil in the settling tanks C: burning the oil D: suspension

Q96 : Steam engine operates on_________________?

A: carnot cycle B: brayton cycle C: Stirling cycle D: joule cycle

Q97 : The diameter of fire tube of Cornish boiler compared to its shell is__________________?

A: one half B: one third C: one-fifth D: two-fifth

Q98 : The stress developed in a material at breaking point in extension is called__________?

A: Breaking stress B: Fracture stress C: Fracture stress D: Fracture stress

Q99 : Rotameter is a device used to measure______________?

A: absolute pressure B: velocity of fluid C: flow D: rotation

Q100 : The saturation temperature of steam with increase in pressure increases____________________?

A: inearly B: rapidly first and then slowly C: slowly first and then rapidly D: inversely

Free Mechanical Engineering MCQs Mock Test Online with Answers

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