Mechanical Engineering Quiz 9

1 / 50

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

same

higher

lower

unity

2 / 50

Center of pressure compared to e.g. is___________________?

above or below depending on area of body

below it

at same point

above it

3 / 50

Jam nut is a locking device in which _____________________?

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

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

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

4 / 50

High carbon steel carries carbon %age c_________________?

0.6 to 0.8%

0.1 to 0.3%

0.8 to 1.5%

0.3 to 0.6%

5 / 50

Gamma iron exits at following temperature___________________?

between 1400?C and 1539?C

between 910?C and 1400?C

room temperature

near melting point

6 / 50

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

24.5 mm, 65 mm

65.5 mm, 210 mm

47.5 mm, 130 mm

32.5 mm, 180 mm

7 / 50

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

brown coal

peat

none of the above

non-coking bituminous coal

8 / 50

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

research and development

all of the above

maintenance jobs

once through project

9 / 50

Barometric pressure is equal to_____________________?

1 mm Hg

zero mm Hg

760 mm Hg

735.6 mm Hg

10 / 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________________?

625?K

700?K

600?K

650?K

11 / 50

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

water

ideal fluid

gas

fluid

12 / 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__________________?

10 kg, + ve sense

20 kg, + ve sense

20 kg, ? ve sense

10 kg, ? ve sense

13 / 50

Select the correct statement?

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

Local atmospheric pressure depends upon elevation of locality only

Local atmospheric pressure is always below standard atmospheric pressure

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

14 / 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

hyperbola

circle

parabola

15 / 50

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

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 requires unit power per unit head

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

16 / 50

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

titanium alloys

magnesium alloys

magnetic steel alloys

chromium alloys

17 / 50

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

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

may open or close anywhere

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

18 / 50

Efficiency of a thermal cycle increases by ________________?

reheating of steam

regeneration

All

None

19 / 50

Plastic flow in ductile materials_____________________?

depends on other considerations

lessens the seriousness of static load?ing stress concentration

increases the seriousness of static load-ing stress concentration

has no effect on it

20 / 50

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

magnesium

nickel

manganese

silicon

21 / 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

0.6

0.25

0.2

22 / 50

Descripancies of bar chart techniques are________________?

free time available for an activity can?t be predicted

all of the above

consequential effects of lack in one activity on the finish date

consequential effects of lack in one activity on omer

23 / 50

Effective moderators are those materials which contain____________________?

zero weight atoms

heavy weight atoms

critical atoms

light weight atoms

24 / 50

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

same

depends on quality of fuel

lower

higher

25 / 50

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

about 1.7 times

about 0.5 times

about twice

nearly equal

26 / 50

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

centrifugal

electromagnetic

axial

reciprocation

27 / 50

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

to increase length

to decrease length

unaffected by length

other factors would decide same

28 / 50

Fuel consumption with increase in back pressure will________________?

depend on other factors

remain unaffected

increase

decrease

29 / 50

An isolated system is one in which_____________________?

neither mass nor energy crosses the boundaries of the system

both energy and mass cross 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

30 / 50

An adiabatic wall is one which__________________?

encourages thermal interaction

permits thermal interaction

discourages thermal interaction

prevents thermal interaction

31 / 50

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

boundary layer

wake

drag

lift

32 / 50

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

reduce heat transfer to the engine room

increase engine efficiency

reduce formation of condenstae

keep the exhaust pipes warm

33 / 50

The correct composition of Babbit metal is__________________?

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

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

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

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

34 / 50

In precombustion chamber in diesel engine________________?

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

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

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

There are no valves

35 / 50

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

along tangential 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

along perpendicular to angular velocity

along the centripetal acceleration

36 / 50

Corrundum contains more than 95% _____________________?

Si02

steel

MgO

A1203

37 / 50

Corrosion resistance of steel is increased by adding__________________?

nickel and molybdenum

chromium and nickel

tungsten and sulfur

aluminium and zinc

38 / 50

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

fatigue

endurance

plastic deformation

creep

39 / 50

Carbon in iron is an example of__________________?

intermetallic compounds

substitutional solution

interstitial solid solution

all of the above

40 / 50

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

arm of man

pair of clinical tongs

all of the above

pair of scissors

41 / 50

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

polytropic

any one of the above

isothermal

adiabatic

42 / 50

Queuing theory deals with problems of________________?

material handling

effective use of machines

better utilization of man services

reducing the waiting time or idle Jajme

43 / 50

Pitch point on a cam is_________________?

the point on cam pitch curve having the maximum pressure angle

any point on pitch circle

the point on cam pitch curve having the minimum pressure angle

any point on pitch curve

44 / 50

Low specific speed of turbine implies it is__________________?

any one of the above

propeller turbine

Francis turbine

impulse turbine

45 / 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

46 / 50

Permalloy is a___________________?

kind of stainless steel

nickel and iron alloy having high permeability

polymer

none ferrous alloy

47 / 50

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

along AO

parallel to OA

at 45? to OA

perpendicular to OA

48 / 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_________________?

less than the weight of the body

the weight of the body

weight of the fluid displaced by the body

more than the weight of the body

49 / 50

The unit of radio-activity is_____________?

curie

MeV

electron-volt

electron-ampere

50 / 50

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

1000

2700

2100

21,000

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