Mechanical Engineering Quiz 17

1 / 50

Split 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

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

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

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

2 / 50

The resultant of all normal pressures acts___________________?

at center of pressure

at metacentre

vertically upwards

at e.g. of body

3 / 50

The unit of Young?s modulus is__________________?

mm/mm

kg/cm

kg/cm2

4 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 57

RC 48

RC 80

RC 65

5 / 50

?Killed steels? are those steels__________________?

which after their destruction are recycled to produce fresh steel

in which carbon is completely burnt

which are deoxidised in the ladle with silicon and aluminium

which are destroyed by burning

6 / 50

Volatility of diesel fuel oil is_________________?

temperature at which it solidifies or congeals

minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

it catches fire without external aid

7 / 50

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

less

same

more/less depending on rating

8 / 50

Which of the following is the binding material in cemented carbides___________________?

cobalt

nickel

iron

vanadium

9 / 50

Ratio of indicated h.p. to shaft h.p. in known as__________________?

isothermal efficiency

mechanical efficiency

compressor efficiency

volumetric efficiency

10 / 50

Two non-collinear parallel equal forces acting in opposite direction__________________?

constitute a moment

constitute a moment of couple

balance each other

constitute a couple

11 / 50

The number of drums in Benson steam generator is_________________?

one

one steam drum and one water drum

no drum

two

12 / 50

Job enrichment technique is applied to_________________?

reduce labour monotony

make people happy

all of the above

overcome boring and demotivating work

13 / 50

Joule sec is the unit of_________________?

thermal conductivity

kinematic viscosity

universal gas constant

Planck?s constant

14 / 50

Brass contains___________________?

90% copper and 10% tin

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

70-75% copper and rest tin

70% copper and 30% zinc

15 / 50

The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of____________?

0.75

0.25

0.55

0.45

16 / 50

Overfire burning is the phenomenon of _____________________?

supply of excess, air

burning CO and unburnts in upper zone of furnace by supplying more air

supply of excess coal

fuel bed firing

17 / 50

Thermal conductivity of air at room temperature in kcal/m hr ?C is of the order of__________________?

0.1

0.02

0.01

0.002

18 / 50

Solder is an alloy consisting of________________?

tin, antimony, copper

tin and lead

lead and zinc

tin and copper

19 / 50

Fire tube boilers are those in which__________________?

flue gases pass through tubes and water around it

water passes through the tubes and flue gases around it

tubes are laid vertically

forced circulation takes place

20 / 50

Which is correct statement ?

which one is rigid will depend on several other factors

a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

both will be equally rigid

a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron

21 / 50

Manometer is used to measure__________________?

atmospheric pressure

very low pressure

difference of pressure between two points

pressure in pipes, channels etc

22 / 50

The surface hardness of the following order is achieved by nitriding operation__________________?

600 VPN

1000 to 1100 VPN

1500 VPN

250 VPN

23 / 50

In reaction turbine, draft tube is used_____________________?

to transport water downstream without eddies

for safety of turbine

to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

to increase flow rate

24 / 50

An optimum project schedule implies_______________?

timely execution of project

to produce best results under given constraints

lowest possible cost and shortest possible time for project

optimum utilization of men, machines and materials

25 / 50

Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?

mixture of methane and ethane

alpha methyl napthalene

iso-octane

mixture of normal heptane and iso-oc-tane

26 / 50

If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella ________________________?

less inclined when moving

more inclined when standing

less inclined when standing

more inclined when moving

27 / 50

Which of the following particles is the lightest__________________?

meson

nucleus

proton

electron

28 / 50

Increase in pressure at the outer edge of a drum of radius R due to rotation at corad/sec, full of liquid of density p will be___________________?

pco2/?2/2

pa2R/2

pco2/?2

2pa2R2

29 / 50

Bar charts are suitable for_____________________?

minor works

large projects

all of the above

major works

30 / 50

A sudden fall in the barometer reading is a sign of approaching________________?

rains

cold wave

fine weather

storm

31 / 50

Preheating is essential in welding ___________________?

high speed steel

cast iron

all non-ferrous materials

all of the above

32 / 50

A file removes the metal during___________________?

both forward and return strokes

forward stroke

none of these

return stroke

33 / 50

Where does the lowest temperature occur in a vapour compression cycle ?

compressor

condenser

expansion valve

evaporator

34 / 50

Medium specific speea of turbine implies it is___________________?

Francis turbine

propeller turbine

any one of the above

impulse turbine

35 / 50

In nuclear fission___________________?

none of the above

the original elements change into completely different elements

the electrons of the element change

the molecules rearrange themselves to form other molecules

36 / 50

PERT has following time estimate_________________?

two time estimate

three time estimate

one time estimate

four time estimate

37 / 50

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?

more heating surface

equal heating surface

less heating surface

heating surface depends on other parameters

38 / 50

One of the purposes of sub-cooling the liquid refrigerant is to________________?

increase cooling effect

reduce compressor discharge temperature

reduce compressor overheating

ensure that only liquid and not the vapour enters the expansion (throttling) valve

39 / 50

Volumetric efficiency of a compressor with clearance volume ________________?

may increase/decrease depending on compressor capacity

decreases with increase in compression ratio

increases with increase in compression ratio

in not dependent upon compression ratio

40 / 50

In its simplest form, a cam mechanism consists of following number of links___________________?

41 / 50

The energy required to be applied to a radioactive nucleus for the emission of a neutron is________________?

7.8 MeV

4.3 MeV

1 MeV

2.4 MeV

42 / 50

Solid injection in I.C engines refers to injection of________________?

solid fuel

liquid fuel and air

liquid fuel only

solid fuel and air

43 / 50

A stoichiometric air-fuel ratio is______________________?

lean mixture

rich mixture for idling

rich mixture for over loads

chemically correct mixture

44 / 50

As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?

increases

remains same

first increases and then decreases

decreases

45 / 50

Gear box is used___________________?

for speed reduction

to produce torque

to increase efficiency of system

to obtain variable speeds

46 / 50

The index of compression n tends to reach ratio of specific heats y when____________________?

process is isothermal

process is isentropic

process is isentropic and specific heat does not change with temperature

flow is uniform and steady

47 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant pressure

constant volume

constant enthaply

constant temperature

48 / 50

Boiling water reactor employs__________________?

direct cycle of coolant system

multi pass system

double circuit system of coolant cycle

boiler

49 / 50

The efficiency of jet engine is__________________?

same at all altitudes

higher at high altitudes

higher at ground

higher at high speed

50 / 50

The time of completing a project in network analysis is given by following time of the critical activity meeting at the finalitiode_________________?

late finish

early finish

early start

late start

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