Mechanical Engineering Quiz 17

1 / 50

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

rains

fine weather

storm

cold wave

2 / 50

Which is correct statement ?

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

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

3 / 50

The efficiency of jet engine is__________________?

higher at ground

higher at high speed

higher at high altitudes

same at all altitudes

4 / 50

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

process is isentropic and specific heat does not change with temperature

process is isentropic

flow is uniform and steady

process is isothermal

5 / 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

2pa2R2

pco2/?2

pa2R/2

6 / 50

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

0.01

0.002

0.02

0.1

7 / 50

An optimum project schedule implies_______________?

optimum utilization of men, machines and materials

lowest possible cost and shortest possible time for project

timely execution of project

to produce best results under given constraints

8 / 50

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

9 / 50

A stoichiometric air-fuel ratio is______________________?

rich mixture for over loads

lean mixture

chemically correct mixture

rich mixture for idling

10 / 50

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

2.4 MeV

4.3 MeV

1 MeV

7.8 MeV

11 / 50

Joule sec is the unit of_________________?

Planck?s constant

kinematic viscosity

universal gas constant

thermal conductivity

12 / 50

Brass contains___________________?

70-75% copper and rest tin

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

70% copper and 30% zinc

90% copper and 10% tin

13 / 50

The resultant of all normal pressures acts___________________?

at e.g. of body

at metacentre

vertically upwards

at center of pressure

14 / 50

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

late start

late finish

early start

early finish

15 / 50

Volatility of diesel fuel oil is_________________?

it catches fire without external aid

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

temperature at which it solidifies or congeals

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

16 / 50

Job enrichment technique is applied to_________________?

all of the above

make people happy

overcome boring and demotivating work

reduce labour monotony

17 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant volume

constant enthaply

constant temperature

constant pressure

18 / 50

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

condenser

evaporator

compressor

expansion valve

19 / 50

Preheating is essential in welding ___________________?

all non-ferrous materials

high speed steel

all of the above

cast iron

20 / 50

Fire tube boilers are those in which__________________?

water passes through the tubes and flue gases around it

tubes are laid vertically

flue gases pass through tubes and water around it

forced circulation takes place

21 / 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

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

22 / 50

Bar charts are suitable for_____________________?

all of the above

minor works

large projects

major works

23 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 48

RC 57

RC 80

RC 65

24 / 50

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

alpha methyl napthalene

mixture of methane and ethane

iso-octane

mixture of normal heptane and iso-oc-tane

25 / 50

?Killed steels? are those steels__________________?

which are deoxidised in the ladle with silicon and aluminium

which are destroyed by burning

in which carbon is completely burnt

which after their destruction are recycled to produce fresh steel

26 / 50

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

600 VPN

1000 to 1100 VPN

250 VPN

1500 VPN

27 / 50

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

heating surface depends on other parameters

equal heating surface

more heating surface

less heating surface

28 / 50

The unit of Young?s modulus is__________________?

kg/cm2

kg/cm

mm/mm

29 / 50

Gear box is used___________________?

to produce torque

for speed reduction

to increase efficiency of system

to obtain variable speeds

30 / 50

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

same

more/less depending on rating

less

31 / 50

Medium specific speea of turbine implies it is___________________?

Francis turbine

propeller turbine

any one of the above

impulse turbine

32 / 50

In reaction turbine, draft tube is used_____________________?

for safety of turbine

to increase flow rate

to transport water downstream without eddies

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

33 / 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

more inclined when moving

less inclined when standing

34 / 50

The number of drums in Benson steam generator is_________________?

one steam drum and one water drum

one

two

no drum

35 / 50

In nuclear fission___________________?

the original elements change into completely different elements

the molecules rearrange themselves to form other molecules

none of the above

the electrons of the element change

36 / 50

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

liquid fuel and air

solid fuel

liquid fuel only

solid fuel and air

37 / 50

Manometer is used to measure__________________?

difference of pressure between two points

very low pressure

atmospheric pressure

pressure in pipes, channels etc

38 / 50

Overfire burning is the phenomenon of _____________________?

fuel bed firing

supply of excess coal

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

supply of excess, air

39 / 50

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

vanadium

nickel

cobalt

iron

40 / 50

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

compressor efficiency

volumetric efficiency

isothermal efficiency

mechanical efficiency

41 / 50

PERT has following time estimate_________________?

three time estimate

two time estimate

four time estimate

one time estimate

42 / 50

A file removes the metal during___________________?

both forward and return strokes

return stroke

none of these

forward stroke

43 / 50

Which of the following particles is the lightest__________________?

electron

meson

proton

nucleus

44 / 50

Solder is an alloy consisting of________________?

lead and zinc

tin and lead

tin, antimony, copper

tin and copper

45 / 50

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

0.25

0.45

0.75

0.55

46 / 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 discharge temperature

reduce compressor overheating

47 / 50

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

constitute a moment

constitute a couple

constitute a moment of couple

balance each other

48 / 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

49 / 50

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

first increases and then decreases

remains same

decreases

increases

50 / 50

Boiling water reactor employs__________________?

boiler

double circuit system of coolant cycle

direct cycle of coolant system

multi pass system

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