Mechanical Engineering Quiz 17

1 / 50

Manometer is used to measure__________________?

atmospheric pressure

very low pressure

difference of pressure between two points

pressure in pipes, channels etc

2 / 50

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

liquid fuel and air

solid fuel and air

solid fuel

liquid fuel only

3 / 50

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

constitute a moment of couple

constitute a moment

balance each other

constitute a couple

4 / 50

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

mixture of normal heptane and iso-oc-tane

alpha methyl napthalene

mixture of methane and ethane

iso-octane

5 / 50

The resultant of all normal pressures acts___________________?

at center of pressure

vertically upwards

at metacentre

at e.g. of body

6 / 50

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

cold wave

rains

storm

fine weather

7 / 50

Gear box is used___________________?

to obtain variable speeds

for speed reduction

to produce torque

to increase efficiency of system

8 / 50

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

nickel

cobalt

vanadium

iron

9 / 50

In nuclear fission___________________?

the electrons of the element change

the molecules rearrange themselves to form other molecules

none of the above

the original elements change into completely different elements

10 / 50

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

compressor

evaporator

expansion valve

condenser

11 / 50

Volatility of diesel fuel oil is_________________?

temperature at which it solidifies or congeals

it catches fire without external aid

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

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

12 / 50

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

13 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant volume

constant pressure

constant enthaply

constant temperature

14 / 50

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

early finish

late finish

early start

late start

15 / 50

Preheating is essential in welding ___________________?

all non-ferrous materials

all of the above

cast iron

high speed steel

16 / 50

Fire tube boilers are those in which__________________?

tubes are laid vertically

water passes through the tubes and flue gases around it

flue gases pass through tubes and water around it

forced circulation takes place

17 / 50

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

more inclined when standing

less inclined when moving

less inclined when standing

more inclined when moving

18 / 50

A stoichiometric air-fuel ratio is______________________?

rich mixture for over loads

chemically correct mixture

lean mixture

rich mixture for idling

19 / 50

Medium specific speea of turbine implies it is___________________?

Francis turbine

any one of the above

impulse turbine

propeller turbine

20 / 50

Brass contains___________________?

70% copper and 30% zinc

90% copper and 10% tin

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

70-75% copper and rest tin

21 / 50

Which is correct statement ?

both will be equally rigid

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

which one is rigid will depend on several other factors

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

22 / 50

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

mechanical efficiency

volumetric efficiency

isothermal efficiency

compressor efficiency

23 / 50

Solder is an alloy consisting of________________?

tin, antimony, copper

tin and lead

tin and copper

lead and zinc

24 / 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

25 / 50

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

600 VPN

1500 VPN

1000 to 1100 VPN

250 VPN

26 / 50

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

more/less depending on rating

less

same

27 / 50

The number of drums in Benson steam generator is_________________?

one steam drum and one water drum

two

no drum

one

28 / 50

Boiling water reactor employs__________________?

boiler

double circuit system of coolant cycle

direct cycle of coolant system

multi pass system

29 / 50

?Killed steels? are those steels__________________?

which are destroyed by burning

which are deoxidised in the ladle with silicon and aluminium

in which carbon is completely burnt

which after their destruction are recycled to produce fresh steel

30 / 50

Split 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 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

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

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

31 / 50

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

1 MeV

2.4 MeV

7.8 MeV

4.3 MeV

32 / 50

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

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

reduce compressor overheating

reduce compressor discharge temperature

increase cooling effect

33 / 50

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

decreases

first increases and then decreases

remains same

increases

34 / 50

A file removes the metal during___________________?

return stroke

none of these

both forward and return strokes

forward stroke

35 / 50

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

flow is uniform and steady

process is isentropic

process is isothermal

process is isentropic and specific heat does not change with temperature

36 / 50

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

0.02

0.1

0.01

0.002

37 / 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

0.45

0.25

0.55

38 / 50

PERT has following time estimate_________________?

one time estimate

four time estimate

two time estimate

three time estimate

39 / 50

An optimum project schedule implies_______________?

timely execution of project

optimum utilization of men, machines and materials

lowest possible cost and shortest possible time for project

to produce best results under given constraints

40 / 50

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

equal heating surface

more heating surface

heating surface depends on other parameters

less heating surface

41 / 50

Which of the following particles is the lightest__________________?

nucleus

proton

meson

electron

42 / 50

The unit of Young?s modulus is__________________?

mm/mm

kg/cm2

kg/cm

43 / 50

Joule sec is the unit of_________________?

thermal conductivity

kinematic viscosity

universal gas constant

Planck?s constant

44 / 50

Overfire burning is the phenomenon of _____________________?

fuel bed firing

supply of excess, air

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

supply of excess coal

45 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 57

RC 65

RC 48

RC 80

46 / 50

Job enrichment technique is applied to_________________?

reduce labour monotony

make people happy

overcome boring and demotivating work

all of the above

47 / 50

The efficiency of jet engine is__________________?

higher at ground

higher at high altitudes

same at all altitudes

higher at high speed

48 / 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

2pa2R2

pco2/?2/2

pa2R/2

49 / 50

Bar charts are suitable for_____________________?

minor works

major works

all of the above

large projects

50 / 50

Volumetric efficiency of a compressor with clearance volume ________________?

decreases with increase in compression ratio

in not dependent upon compression ratio

increases with increase in compression ratio

may increase/decrease depending on compressor capacity

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