Mechanical Engineering Quiz 9

1 / 50

Corrosion resistance of steel is increased by adding__________________?

chromium and nickel

tungsten and sulfur

nickel and molybdenum

aluminium and zinc

2 / 50

Maximum work is done in compressing air when the compression is_________________?

any one of the above

polytropic

isothermal

adiabatic

3 / 50

In a rigid link OA, velocity of A w.r.t. will be___________________?

parallel to OA

perpendicular to OA

along AO

at 45? to OA

4 / 50

An engine operates between temperatures of 900?Kandr2 and another engine between T2 and 400?K For both to do equal work, value of T2 will be________________?

650?K

625?K

700?K

600?K

5 / 50

Carbon in iron is an example of__________________?

interstitial solid solution

intermetallic compounds

all of the above

substitutional solution

6 / 50

PERT/CPM, techniques can be used for following applications____________________?

maintenance jobs

all of the above

research and development

once through project

7 / 50

Which of the following varieties of coals is mostly used in steam boilers____________________?

brown coal

none of the above

non-coking bituminous coal

peat

8 / 50

The direction of Corioli?s component of acceleration is the direction _____________________?

along perpendicular to angular velocity

of relative velocity vector for the two coincident points rotated by 90? in the direction of the angular velocity of the rotation of the link

along the centripetal acceleration

along tangential acceleration

9 / 50

Exhaust pipes of engines are covered with insulating marterial in order to_________________?

reduce heat transfer to the engine room

reduce formation of condenstae

increase engine efficiency

keep the exhaust pipes warm

10 / 50

The diameters of fire tubes and superheaer tubes in locomotive boiler are_________________?

47.5 mm, 130 mm

32.5 mm, 180 mm

24.5 mm, 65 mm

65.5 mm, 210 mm

11 / 50

The region between the separation streamline and the boundary surface of the solid body is known as__________________?

boundary layer

drag

wake

lift

12 / 50

Low specific speed of turbine implies it is__________________?

any one of the above

impulse turbine

propeller turbine

Francis turbine

13 / 50

Gamma iron exits at following temperature___________________?

between 910?C and 1400?C

near melting point

room temperature

between 1400?C and 1539?C

14 / 50

According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________?

weight of the fluid displaced by the body

more than the weight of the body

less than the weight of the body

the weight of the body

15 / 50

Corrundum contains more than 95% _____________________?

A1203

MgO

steel

Si02

16 / 50

Effective moderators are those materials which contain____________________?

light weight atoms

heavy weight atoms

zero weight atoms

critical atoms

17 / 50

Which of the following has highest specific strength of all structural materials__________________?

chromium alloys

magnetic steel alloys

titanium alloys

magnesium alloys

18 / 50

Barometric pressure is equal to_____________________?

zero mm Hg

1 mm Hg

735.6 mm Hg

760 mm Hg

19 / 50

The specific speed of turbine is defined as the speed of a unit___________________?

of such a size that it produces unit horse power with unit head

of such a size that it delivers unit dis-charge at unit power

of such a size that it requires unit power per unit head

of such a size that it delivers unit dis-charge at unit head

20 / 50

An adiabatic wall is one which__________________?

prevents thermal interaction

permits thermal interaction

discourages thermal interaction

encourages thermal interaction

21 / 50

Other method of reducing shock load in the above case can be_________________?

to decrease length

other factors would decide same

to increase length

unaffected by length

22 / 50

In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?

opens at 10? after top dead center and closes 20? before the bottom dead center

opens at top dead center and closes at bottom dead center

opens at 20? before top dead center and closes at 35? after the bottom dead center

may open or close anywhere

23 / 50

Incomplete combustion can be best judged by__________________?

measuring carbon mono-oxide in flue gases

measuring temperature of flue gases at exit of furnace

excess air in flue gases

smoky chimney exit

24 / 50

Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one_______________?

ellipse

parabola

circle

hyperbola

25 / 50

If no resistance is encountered by displacement, such a substance is known as ___________________?

water

fluid

ideal fluid

gas

26 / 50

Efficiency of a thermal cycle increases by ________________?

All

regeneration

None

reheating of steam

27 / 50

An isolated system is one in which_____________________?

mass does not cross boundaries of the system, though energy may do so

both energy and mass cross the boundaries of the system

neither mass nor energy crosses the boundaries of the system

mass crosses the boundary but not the energy

28 / 50

High carbon steel carries carbon %age c_________________?

0.8 to 1.5%

0.6 to 0.8%

0.1 to 0.3%

0.3 to 0.6%

29 / 50

Queuing theory deals with problems of________________?

better utilization of man services

effective use of machines

material handling

reducing the waiting time or idle Jajme

30 / 50

In precombustion chamber in diesel engine________________?

Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

There are no valves

Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

31 / 50

Descripancies of bar chart techniques are________________?

consequential effects of lack in one activity on the finish date

all of the above

free time available for an activity can?t be predicted

consequential effects of lack in one activity on omer

32 / 50

The correct composition of Babbit metal is__________________?

87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

87% Sn, 4% Cu, 8% Sb, 1% Al

90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

33 / 50

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

2700

1000

2100

21,000

34 / 50

Plastic flow in ductile materials_____________________?

has no effect on it

depends on other considerations

lessens the seriousness of static load?ing stress concentration

increases the seriousness of static load-ing stress concentration

35 / 50

Which of the following is the example of lever of first order__________________?

pair of clinical tongs

pair of scissors

arm of man

all of the above

36 / 50

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?

0.25

0.2

0.6

0.5

37 / 50

Fuel consumption with increase in back pressure will________________?

remain unaffected

depend on other factors

decrease

increase

38 / 50

Select the correct statement?

A barometer reads the difference be-tween local and standard atmospheric pressure

Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

Local atmospheric pressure depends upon elevation of locality only

Local atmospheric pressure is always below standard atmospheric pressure

39 / 50

For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?

about 0.5 times

about 1.7 times

nearly equal

about twice

40 / 50

The following element can?t impart high strength at elevated temperature__________________?

silicon

manganese

magnesium

nickel

41 / 50

Permalloy is a___________________?

kind of stainless steel

nickel and iron alloy having high permeability

none ferrous alloy

polymer

42 / 50

The unit of radio-activity is_____________?

electron-volt

curie

electron-ampere

MeV

43 / 50

The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?

higher

unity

same

lower

44 / 50

Slow plastic defomiation of metals under a constant stress is known as________________?

plastic deformation

endurance

creep

fatigue

45 / 50

Pitch point on a cam is_________________?

the point on cam pitch curve having the minimum pressure angle

the point on cam pitch curve having the maximum pressure angle

any point on pitch circle

any point on pitch curve

46 / 50

Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal_________________?

axial

centrifugal

electromagnetic

reciprocation

47 / 50

Center of pressure compared to e.g. is___________________?

above it

below it

at same point

above or below depending on area of body

48 / 50

Jam nut is a locking device in which _____________________?

one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

a slot is cut partly in middle of nut and then slot reduced by tightening a screw

through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

49 / 50

The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ? ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________?

20 kg, ? ve sense

10 kg, + ve sense

20 kg, + ve sense

10 kg, ? ve sense

50 / 50

The self-ignition temperature of diesel oil compared to petrol is_________________?

same

depends on quality of fuel

higher

lower

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 67%