Mechanical Engineering Quiz 13

1 / 50

In an isothermal atmosphere, the pressure___________________?

remains constant

increases exponentially with elevation

varies in the same way as the density

decreases linearly with elevation

2 / 50

In A-B-C control policy, maximum attention is given to__________________?

those items which consume money

those x items which are in more demand

those items which consume more money

those items which are not readily available

3 / 50

A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227? C and 27? His claim is__________________?

justified

not possible

may be possible with lot of sophistications

cost will be very high

4 / 50

Nickel in steel___________________?

refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper?ties

gives ductility, toughness, tensile strength and anticorrosion properties

improves cutting ability and reduces hardenability

improves wear resistance, cutting ability and toughness

5 / 50

Rotameter is a device used to measure______________?

velocity of fluid

flow

rotation

absolute pressure

6 / 50

Coke is produced by__________________?

binding the pulverised coal into brick-etts

pulverising coal in inert atmosphere

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

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

7 / 50

Stirling and Ericsson cycles are__________________?

semi-reversible cycles

quasi-static cycles

reversible cycles

irreversible cycles

8 / 50

A backing ring is used inside the pipe joint when making a___________________?

fillet weld

sleeve weld

socket weld

butt weld

9 / 50

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

0.4

0.515

0.5

10 / 50

In a diesel engine, injection pressure developed by injector is of the order of______________?

100 kg/cm2

500 kg/cm2

10 kg/cm2

1400 kg/cm2

11 / 50

Cavitation is caused by_____________________?

weak material

low pressure

high pressure

high velocity

12 / 50

Angle of descent of cam is defined as the angle__________________?

moved by the cam from the instant the follower begins to rise, till it reaches its highest position

during which the follower returns to its initial position

of rotation of the cam for a definite displacement of the follower

through which the cam rotates during the period in which the follower remains in the highest position

13 / 50

If the surface of liquid is convex, men ___________________?

cohesion pressure is decreased

cohesion pressure is increased

cohesion pressure is negligible

there is no cohesion pressure

14 / 50

A kinematic chain requires at least________________________?

3 links and 4 turning pairs

5 links and 4 turning pairs

4 links and 4 turning pairs

2 links and 3 turning pairs

15 / 50

Materials after cold working are subjected to following process to relieve stresses__________________?

annealing

normalising

tempering

hot working

16 / 50

Air fuel ratio at which a petrol engine can not work is_________________?

20 : 1 and less

8:01

10:01

15:01

17 / 50

Silver-based solder is used for__________________?

brazing

fusion welding

soft soldering

flaring

18 / 50

In S.H.M., acceleration is proportional to _________________?

all of the above

rate of change of velocity

velocity

displacement

19 / 50

According to first law of thermodynamics__________________?

total energy of a system remains constant

work done by a system is equal to heat transferred by the system

internal energy, enthalpy and entropy during a process remain constant

total internal energy of a system during a process remains constant

20 / 50

The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?

dependence of forces

independence of forces

forces

resolution of forces

21 / 50

If a heat pump cycle operates between the condenser temperature of +27?C and evaporator temperature of ? 23?C, then the Carnot COP will be_________________?

1.2

0.2

22 / 50

Pick up the wrong statement about critical condition of steam___________________?

this is the maximum pressure limit

latent heat is zero

liquid directly becomes steam

specific volume of steam and liquid is same

23 / 50

In ideal machines__________________?

mechanical advantage is unity

mechanical advantage is greater than velocity ratio

mechanical advantage is less than velocity ratio

mechanical advantage is equal to velocity ratio

24 / 50

If some links are connected such that motion between them can take place in more than one direction, it is called_______________?

partially constrained motion

successfully constrained motion

completely constrained motion

incompletely constrained motion

25 / 50

Aluminium bronze contains aluminium and copper in the ratio of___________________?

40 : 60

60:40:00

0.479166667

50:50:00

26 / 50

Recrystallization temperature is one________________?

at which change of allotropic form takes place

at which crystals grow bigger in size

at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

at which crystals first start forming from molten metal when it is cooled

27 / 50

Temperature of a gas is produced due to________________?

kinetic energy of molecules

repulsion of molecules

attraction of molecules

its heating value

28 / 50

According to Stefan?s law, the total radiation from a black body per second per unit area is proportional to____________________?

absolute temperature

29 / 50

In locomotive boiler, maximum steam pressure is limited to_______________?

18 kg/cm2

5 kg/cm2

1 kg/cm2

10 kg/cm2

30 / 50

German silver is an alloy of___________________?

nickel, copper and zinc

nickel and copper

silver and some impurities

refined silver

31 / 50

Bronze contains_____________________?

90% copper and 10% tin

85-92% copper and rest tin with little lead and nickel

70-75% copper and rest tin

70% copper and 30% zinc

32 / 50

The higher temperature in vapour compression cycle occurs at____________________?

receiver

expansion valve

compressor discharge

evaporator

33 / 50

The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is________________?

double

same

half

four times

34 / 50

A non-yielding support implies that the_________________?

support can take any amount of reaction

support is frictionless

slope of the beam at the support is zero

support holds member firmly

35 / 50

Effect of a force on a body depends upon ________________?

position or line of action

direction

all of the above

magnitude

36 / 50

Which of the following is secondary fuel ?

non oh these

U233andPu238

U233andPu239

Th232andU238

37 / 50

Which of the following cycles has maximum efficiency_____________?

Carnot

Rankine

Brayton

Stirling

38 / 50

Taper usually provided on cotter is_________________?

1 in 5

1 in 40

1 in 10

1 in 24

39 / 50

Spontaneous combustion is a phenomenon in which____________________?

all the fuel burns instantaneously producing high energy release

fuel burns with less air

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

explosion in furnace

40 / 50

The knocking in diesel engines for given fuel, will be__________________?

enhanced by increasing compression ratio

first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed

unaflected by compression ratio

enhanced by decreasing compression ratio

41 / 50

Water is injected in gas turbine cycle to___________________?

control output of turbine

control fire hazards

control temperature

increase efficiency

42 / 50

Which of the following instruments is used to measure flow on the application of Bernoulli?s theorem_________________?

nozzle

all of the above

Orifice plate

Venturimeter

43 / 50

1 m of air at atmospheric condition weighs approximately__________________?

1.0 kg

1.3 kg

0.5 kg

2.2 kg

44 / 50

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is___________________?

less

same

could be more or less depending on other factors

45 / 50

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?

910?C

770?C

below recrystallisation temperature

1050?C

46 / 50

Volumetric efficiency is_____________________?

the ratio of stroke volume to clearance volume

reciprocal of compression ratio

index of compressor performance

the ratio of the air actually delivered to the amount of piston displacement

47 / 50

Which is not correct statement about the function of furnace____________________?

separate ash from coal

maintain heat supply to prepare and ignite the incoming fuel

mix fuel with air and ignite

to provide proper conditions for con-tinuous complete combustion

48 / 50

Pig iron is the name given to________________?

raw material for blast furnace

product of blast furnace made by reduction of iron ore

iron containing huge quantities of carbon

iron in molten form in the ladles

49 / 50

The unit of work or energy in S.I. units is_______________?

kilogram meter

joule

newton

pascal

50 / 50

A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is_________________?

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