Mechanical Engineering Quiz 9

1 / 50

Descripancies of bar chart techniques are________________?

consequential effects of lack in one activity on the finish date

all of the above

consequential effects of lack in one activity on omer

free time available for an activity can?t be predicted

2 / 50

Corrundum contains more than 95% _____________________?

steel

A1203

MgO

Si02

3 / 50

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

0.5

0.2

0.25

0.6

4 / 50

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

unaffected by length

to decrease length

other factors would decide same

to increase length

5 / 50

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

chromium alloys

titanium alloys

magnesium alloys

magnetic steel alloys

6 / 50

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

higher

depends on quality of fuel

lower

same

7 / 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_________________?

the weight of the body

less than the weight of the body

weight of the fluid displaced by the body

more than the weight of the body

8 / 50

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

21,000

2700

1000

2100

9 / 50

Effective moderators are those materials which contain____________________?

zero weight atoms

light weight atoms

critical atoms

heavy weight atoms

10 / 50

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

ideal fluid

gas

water

fluid

11 / 50

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

non-coking bituminous coal

brown coal

peat

none of the above

12 / 50

Carbon in iron is an example of__________________?

intermetallic compounds

all of the above

substitutional solution

interstitial solid solution

13 / 50

Corrosion resistance of steel is increased by adding__________________?

aluminium and zinc

nickel and molybdenum

tungsten and sulfur

chromium and nickel

14 / 50

Permalloy is a___________________?

kind of stainless steel

nickel and iron alloy having high permeability

polymer

none ferrous alloy

15 / 50

Center of pressure compared to e.g. is___________________?

at same point

above or below depending on area of body

above it

below it

16 / 50

Plastic flow in ductile materials_____________________?

has no effect on it

increases the seriousness of static load-ing stress concentration

lessens the seriousness of static load?ing stress concentration

depends on other considerations

17 / 50

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

along tangential acceleration

along perpendicular to angular velocity

along the centripetal acceleration

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

18 / 50

An adiabatic wall is one which__________________?

permits thermal interaction

discourages thermal interaction

prevents thermal interaction

encourages thermal interaction

19 / 50

An isolated system is one in which_____________________?

both energy and mass cross the boundaries of the system

neither mass nor energy crosses the boundaries of the system

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

mass crosses the boundary but not the energy

20 / 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_______________?

hyperbola

ellipse

circle

parabola

21 / 50

Fuel consumption with increase in back pressure will________________?

decrease

remain unaffected

increase

depend on other factors

22 / 50

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

same

lower

higher

unity

23 / 50

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

keep the exhaust pipes warm

reduce formation of condenstae

reduce heat transfer to the engine room

increase engine efficiency

24 / 50

Queuing theory deals with problems of________________?

reducing the waiting time or idle Jajme

effective use of machines

material handling

better utilization of man services

25 / 50

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

creep

endurance

fatigue

plastic deformation

26 / 50

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

magnesium

silicon

manganese

nickel

27 / 50

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

nearly equal

about twice

about 0.5 times

about 1.7 times

28 / 50

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

once through project

maintenance jobs

all of the above

research and development

29 / 50

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

perpendicular to OA

at 45? to OA

parallel to OA

along AO

30 / 50

Efficiency of a thermal cycle increases by ________________?

None

All

reheating of steam

regeneration

31 / 50

Select the correct statement?

Local atmospheric pressure is always below standard atmospheric pressure

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

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

Local atmospheric pressure depends upon elevation of locality only

32 / 50

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

wake

drag

boundary layer

lift

33 / 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________________?

600?K

700?K

650?K

625?K

34 / 50

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

electromagnetic

axial

reciprocation

centrifugal

35 / 50

The unit of radio-activity is_____________?

MeV

electron-volt

curie

electron-ampere

36 / 50

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

arm of man

all of the above

pair of clinical tongs

pair of scissors

37 / 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

38 / 50

Jam nut is a locking device in which _____________________?

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

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

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

39 / 50

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

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

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

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

40 / 50

Gamma iron exits at following temperature___________________?

room temperature

between 910?C and 1400?C

between 1400?C and 1539?C

near melting point

41 / 50

Low specific speed of turbine implies it is__________________?

impulse turbine

any one of the above

propeller turbine

Francis turbine

42 / 50

Incomplete combustion can be best judged by__________________?

measuring temperature of flue gases at exit of furnace

measuring carbon mono-oxide in flue gases

smoky chimney exit

excess air in flue gases

43 / 50

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

may open or close anywhere

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

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

opens at top dead center and closes at bottom dead center

44 / 50

Barometric pressure is equal to_____________________?

760 mm Hg

zero mm Hg

735.6 mm Hg

1 mm Hg

45 / 50

In precombustion chamber in diesel engine________________?

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

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

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

46 / 50

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

47.5 mm, 130 mm

24.5 mm, 65 mm

32.5 mm, 180 mm

65.5 mm, 210 mm

47 / 50

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

any one of the above

polytropic

isothermal

adiabatic

48 / 50

The correct composition of Babbit metal is__________________?

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

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

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

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

49 / 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 curve

any point on pitch circle

50 / 50

High carbon steel carries carbon %age c_________________?

0.1 to 0.3%

0.6 to 0.8%

0.3 to 0.6%

0.8 to 1.5%

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