Mechanical Engineering Quiz 13

1 / 50

Nickel in steel___________________?

improves wear resistance, cutting ability and toughness

gives ductility, toughness, tensile strength and anticorrosion properties

improves cutting ability and reduces hardenability

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

2 / 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

incompletely constrained motion

completely constrained motion

successfully constrained motion

3 / 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

4 / 50

Taper usually provided on cotter is_________________?

1 in 24

1 in 5

1 in 40

1 in 10

5 / 50

In locomotive boiler, maximum steam pressure is limited to_______________?

1 kg/cm2

5 kg/cm2

18 kg/cm2

10 kg/cm2

6 / 50

A kinematic chain requires at least________________________?

2 links and 3 turning pairs

4 links and 4 turning pairs

3 links and 4 turning pairs

5 links and 4 turning pairs

7 / 50

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

all of the above

rate of change of velocity

displacement

velocity

8 / 50

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

1050?C

770?C

below recrystallisation temperature

910?C

9 / 50

Aluminium bronze contains aluminium and copper in the ratio of___________________?

40 : 60

60:40:00

50:50:00

0.479166667

10 / 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__________________?

not possible

may be possible with lot of sophistications

cost will be very high

justified

11 / 50

Stirling and Ericsson cycles are__________________?

irreversible cycles

quasi-static cycles

semi-reversible cycles

reversible cycles

12 / 50

Effect of a force on a body depends upon ________________?

position or line of action

direction

all of the above

magnitude

13 / 50

If the surface of liquid is convex, men ___________________?

cohesion pressure is increased

cohesion pressure is negligible

cohesion pressure is decreased

there is no cohesion pressure

14 / 50

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

15 / 50

Which of the following cycles has maximum efficiency_____________?

Carnot

Rankine

Stirling

Brayton

16 / 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 ?

0.515

0.5

0.4

17 / 50

Rotameter is a device used to measure______________?

rotation

velocity of fluid

absolute pressure

flow

18 / 50

According to first law of thermodynamics__________________?

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

internal energy, enthalpy and entropy during a process remain constant

total energy of a system remains constant

total internal energy of a system during a process remains constant

19 / 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________________?

four times

same

half

double

20 / 50

Angle of descent of cam is defined as the angle__________________?

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

during which the follower returns to its initial position

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

21 / 50

Which of the following is secondary fuel ?

Th232andU238

U233andPu239

non oh these

U233andPu238

22 / 50

A non-yielding support implies that the_________________?

slope of the beam at the support is zero

support holds member firmly

support is frictionless

support can take any amount of reaction

23 / 50

Silver-based solder is used for__________________?

soft soldering

fusion welding

flaring

brazing

24 / 50

1 m of air at atmospheric condition weighs approximately__________________?

0.5 kg

1.0 kg

2.2 kg

1.3 kg

25 / 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

26 / 50

Water is injected in gas turbine cycle to___________________?

control temperature

control fire hazards

increase efficiency

control output of turbine

27 / 50

The higher temperature in vapour compression cycle occurs at____________________?

expansion valve

compressor discharge

evaporator

receiver

28 / 50

In an isothermal atmosphere, the pressure___________________?

remains constant

decreases linearly with elevation

varies in the same way as the density

increases exponentially with elevation

29 / 50

Temperature of a gas is produced due to________________?

attraction of molecules

repulsion of molecules

its heating value

kinetic energy of molecules

30 / 50

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

hot working

annealing

normalising

tempering

31 / 50

Bronze contains_____________________?

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

90% copper and 10% tin

70% copper and 30% zinc

70-75% copper and rest tin

32 / 50

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

10:01

20 : 1 and less

15:01

8:01

33 / 50

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

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

enhanced by decreasing compression ratio

enhanced by increasing compression ratio

unaflected by compression ratio

34 / 50

German silver is an alloy of___________________?

nickel and copper

nickel, copper and zinc

silver and some impurities

refined silver

35 / 50

Recrystallization temperature is one________________?

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 change of allotropic form takes place

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

36 / 50

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

100 kg/cm2

500 kg/cm2

1400 kg/cm2

10 kg/cm2

37 / 50

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

could be more or less depending on other factors

less

same

38 / 50

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

socket weld

fillet weld

butt weld

sleeve weld

39 / 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

resolution of forces

independence of forces

forces

40 / 50

Coke is produced by__________________?

binding the pulverised coal into brick-etts

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

pulverising coal in inert atmosphere

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

41 / 50

Spontaneous combustion is a phenomenon in which____________________?

fuel burns with less air

explosion in furnace

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

all the fuel burns instantaneously producing high energy release

42 / 50

Cavitation is caused by_____________________?

low pressure

high velocity

weak material

high pressure

43 / 50

Volumetric efficiency is_____________________?

reciprocal of compression ratio

index of compressor performance

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

the ratio of stroke volume to clearance volume

44 / 50

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

newton

pascal

kilogram meter

joule

45 / 50

In ideal machines__________________?

mechanical advantage is unity

mechanical advantage is equal to velocity ratio

mechanical advantage is greater than velocity ratio

mechanical advantage is less than velocity ratio

46 / 50

Pig iron is the name given to________________?

raw material for blast furnace

iron in molten form in the ladles

product of blast furnace made by reduction of iron ore

iron containing huge quantities of carbon

47 / 50

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

absolute temperature

48 / 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

49 / 50

Which is not correct statement about the function of furnace____________________?

to provide proper conditions for con-tinuous complete combustion

maintain heat supply to prepare and ignite the incoming fuel

mix fuel with air and ignite

separate ash from coal

50 / 50

Pick up the wrong statement about critical condition of steam___________________?

latent heat is zero

specific volume of steam and liquid is same

liquid directly becomes steam

this is the maximum pressure limit

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