Mechanical Engineering Quiz 13

1 / 50

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

100 kg/cm2

1400 kg/cm2

500 kg/cm2

10 kg/cm2

2 / 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__________________?

forces

dependence of forces

independence of forces

resolution of forces

3 / 50

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

kilogram meter

newton

joule

pascal

4 / 50

In locomotive boiler, maximum steam pressure is limited to_______________?

5 kg/cm2

10 kg/cm2

18 kg/cm2

1 kg/cm2

5 / 50

German silver is an alloy of___________________?

silver and some impurities

refined silver

nickel, copper and zinc

nickel and copper

6 / 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

0.5

0.515

7 / 50

Recrystallization temperature is one________________?

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

at which change of allotropic form takes place

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

at which crystals grow bigger in size

8 / 50

Cavitation is caused by_____________________?

high velocity

weak material

low pressure

high pressure

9 / 50

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

8:01

10:01

15:01

20 : 1 and less

10 / 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

11 / 50

Effect of a force on a body depends upon ________________?

magnitude

position or line of action

direction

all of the above

12 / 50

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

successfully constrained motion

completely constrained motion

incompletely constrained motion

partially constrained motion

13 / 50

Water is injected in gas turbine cycle to___________________?

control output of turbine

control fire hazards

control temperature

increase efficiency

14 / 50

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

sleeve weld

socket weld

butt weld

fillet weld

15 / 50

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

annealing

normalising

tempering

hot working

16 / 50

If the surface of liquid is convex, men ___________________?

there is no cohesion pressure

cohesion pressure is increased

cohesion pressure is decreased

cohesion pressure is negligible

17 / 50

Coke is produced by__________________?

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

binding the pulverised coal into brick-etts

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

pulverising coal in inert atmosphere

18 / 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

19 / 50

Which of the following cycles has maximum efficiency_____________?

Brayton

Stirling

Rankine

Carnot

20 / 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_________________?

0.2

1.2

21 / 50

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

those items which consume money

those items which are not readily available

those items which consume more money

those x items which are in more demand

22 / 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

23 / 50

Volumetric efficiency is_____________________?

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

reciprocal of compression ratio

the ratio of stroke volume to clearance volume

index of compressor performance

24 / 50

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

below recrystallisation temperature

770?C

910?C

1050?C

25 / 50

Silver-based solder is used for__________________?

soft soldering

flaring

brazing

fusion welding

26 / 50

Bronze contains_____________________?

70-75% copper and rest tin

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

90% copper and 10% tin

70% copper and 30% zinc

27 / 50

1 m of air at atmospheric condition weighs approximately__________________?

2.2 kg

1.0 kg

1.3 kg

0.5 kg

28 / 50

Spontaneous combustion is a phenomenon in which____________________?

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

fuel burns with less air

all the fuel burns instantaneously producing high energy release

29 / 50

According to first law of thermodynamics__________________?

total internal energy of a system during a process remains constant

internal energy, enthalpy and entropy during a process remain constant

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

total energy of a system remains constant

30 / 50

Temperature of a gas is produced due to________________?

attraction of molecules

repulsion of molecules

kinetic energy of molecules

its heating value

31 / 50

A kinematic chain requires at least________________________?

4 links and 4 turning pairs

3 links and 4 turning pairs

5 links and 4 turning pairs

2 links and 3 turning pairs

32 / 50

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

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________________?

four times

half

double

same

34 / 50

Taper usually provided on cotter is_________________?

1 in 5

1 in 10

1 in 40

1 in 24

35 / 50

In ideal machines__________________?

mechanical advantage is unity

mechanical advantage is greater than velocity ratio

mechanical advantage is equal to velocity ratio

mechanical advantage is less than velocity ratio

36 / 50

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

displacement

velocity

all of the above

rate of change of velocity

37 / 50

Aluminium bronze contains aluminium and copper in the ratio of___________________?

50:50:00

0.479166667

40 : 60

60:40:00

38 / 50

Pig iron is the name given to________________?

product of blast furnace made by reduction of iron ore

iron in molten form in the ladles

iron containing huge quantities of carbon

raw material for blast furnace

39 / 50

Rotameter is a device used to measure______________?

rotation

absolute pressure

flow

velocity of fluid

40 / 50

Which is not correct statement about the function of furnace____________________?

maintain heat supply to prepare and ignite the incoming fuel

to provide proper conditions for con-tinuous complete combustion

mix fuel with air and ignite

separate ash from coal

41 / 50

Which of the following is secondary fuel ?

non oh these

Th232andU238

U233andPu238

U233andPu239

42 / 50

Stirling and Ericsson cycles are__________________?

reversible cycles

irreversible cycles

semi-reversible cycles

quasi-static cycles

43 / 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

unaflected by compression ratio

enhanced by increasing compression ratio

44 / 50

A non-yielding support implies that the_________________?

slope of the beam at the support is zero

support can take any amount of reaction

support holds member firmly

support is frictionless

45 / 50

Angle of descent of cam is defined as the angle__________________?

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

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

46 / 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

justified

cost will be very high

47 / 50

The higher temperature in vapour compression cycle occurs at____________________?

expansion valve

evaporator

receiver

compressor discharge

48 / 50

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

all of the above

Orifice plate

Venturimeter

nozzle

49 / 50

Nickel in steel___________________?

improves wear resistance, cutting ability and toughness

gives ductility, toughness, tensile strength and anticorrosion properties

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

improves cutting ability and reduces hardenability

50 / 50

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

absolute temperature

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 75%