Mechanical Engineering Quiz 17

1 / 50

An optimum project schedule implies_______________?

optimum utilization of men, machines and materials

timely execution of project

lowest possible cost and shortest possible time for project

to produce best results under given constraints

2 / 50

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

rains

cold wave

fine weather

storm

3 / 50

Which of the following particles is the lightest__________________?

proton

nucleus

electron

meson

4 / 50

The number of drums in Benson steam generator is_________________?

one steam drum and one water drum

two

no drum

one

5 / 50

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

4.3 MeV

1 MeV

2.4 MeV

7.8 MeV

6 / 50

?Killed steels? are those steels__________________?

which are destroyed by burning

in which carbon is completely burnt

which are deoxidised in the ladle with silicon and aluminium

which after their destruction are recycled to produce fresh steel

7 / 50

A file removes the metal during___________________?

both forward and return strokes

forward stroke

none of these

return stroke

8 / 50

Overfire burning is the phenomenon of _____________________?

supply of excess coal

supply of excess, air

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

fuel bed firing

9 / 50

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

early start

late finish

early finish

late start

10 / 50

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

mixture of methane and ethane

alpha methyl napthalene

mixture of normal heptane and iso-oc-tane

iso-octane

11 / 50

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

decreases

increases

remains same

first increases and then decreases

12 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 57

RC 80

RC 48

RC 65

13 / 50

PERT has following time estimate_________________?

three time estimate

one time estimate

four time estimate

two time estimate

14 / 50

The efficiency of jet engine is__________________?

higher at high speed

higher at high altitudes

higher at ground

same at all altitudes

15 / 50

Brass contains___________________?

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

90% copper and 10% tin

70-75% copper and rest tin

70% copper and 30% zinc

16 / 50

Boiling water reactor employs__________________?

direct cycle of coolant system

multi pass system

boiler

double circuit system of coolant cycle

17 / 50

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

isothermal efficiency

volumetric efficiency

compressor efficiency

mechanical efficiency

18 / 50

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

more inclined when moving

more inclined when standing

less inclined when standing

less inclined when moving

19 / 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

20 / 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

21 / 50

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

process is isothermal

process is isentropic

flow is uniform and steady

process is isentropic and specific heat does not change with temperature

22 / 50

Joule sec is the unit of_________________?

kinematic viscosity

thermal conductivity

universal gas constant

Planck?s constant

23 / 50

Manometer is used to measure__________________?

difference of pressure between two points

pressure in pipes, channels etc

atmospheric pressure

very low pressure

24 / 50

Preheating is essential in welding ___________________?

all of the above

all non-ferrous materials

high speed steel

cast iron

25 / 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

26 / 50

Job enrichment technique is applied to_________________?

all of the above

make people happy

overcome boring and demotivating work

reduce labour monotony

27 / 50

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

28 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant enthaply

constant temperature

constant volume

constant pressure

29 / 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

pa2R/2

pco2/?2/2

30 / 50

In reaction turbine, draft tube is used_____________________?

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

to transport water downstream without eddies

to increase flow rate

for safety of turbine

31 / 50

In nuclear fission___________________?

none of the above

the electrons of the element change

the original elements change into completely different elements

the molecules rearrange themselves to form other molecules

32 / 50

Solder is an alloy consisting of________________?

tin and lead

lead and zinc

tin, antimony, copper

tin and copper

33 / 50

Fire tube boilers are those in which__________________?

tubes are laid vertically

water passes through the tubes and flue gases around it

forced circulation takes place

flue gases pass through tubes and water around it

34 / 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

35 / 50

Which is correct statement ?

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

both will be equally rigid

36 / 50

Bar charts are suitable for_____________________?

major works

large projects

all of the above

minor works

37 / 50

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

compressor

evaporator

condenser

expansion valve

38 / 50

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

liquid fuel and air

solid fuel

solid fuel and air

liquid fuel only

39 / 50

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

less heating surface

heating surface depends on other parameters

more heating surface

equal heating surface

40 / 50

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

1500 VPN

600 VPN

250 VPN

1000 to 1100 VPN

41 / 50

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

0.02

0.1

0.002

0.01

42 / 50

Gear box is used___________________?

to obtain variable speeds

for speed reduction

to produce torque

to increase efficiency of system

43 / 50

The unit of Young?s modulus is__________________?

mm/mm

kg/cm

kg/cm2

44 / 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 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

45 / 50

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

nickel

cobalt

vanadium

iron

46 / 50

The resultant of all normal pressures acts___________________?

at e.g. of body

at center of pressure

vertically upwards

at metacentre

47 / 50

Medium specific speea of turbine implies it is___________________?

impulse turbine

propeller turbine

any one of the above

Francis turbine

48 / 50

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

constitute a couple

constitute a moment

constitute a moment of couple

balance each other

49 / 50

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

increase cooling effect

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

reduce compressor overheating

reduce compressor discharge temperature

50 / 50

A stoichiometric air-fuel ratio is______________________?

lean mixture

rich mixture for over loads

chemically correct mixture

rich mixture for idling

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