Mechanical Engineering Quiz 17

1 / 50

Medium specific speea of turbine implies it is___________________?

Francis turbine

any one of the above

propeller turbine

impulse turbine

2 / 50

An optimum project schedule implies_______________?

lowest possible cost and shortest possible time for project

to produce best results under given constraints

optimum utilization of men, machines and materials

timely execution of project

3 / 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 discharge temperature

increase cooling effect

reduce compressor overheating

4 / 50

The resultant of all normal pressures acts___________________?

at center of pressure

vertically upwards

at metacentre

at e.g. of body

5 / 50

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

fine weather

cold wave

rains

storm

6 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 65

RC 80

RC 48

RC 57

7 / 50

Bar charts are suitable for_____________________?

large projects

all of the above

minor works

major works

8 / 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

more inclined when moving

less inclined when standing

9 / 50

Overfire burning is the phenomenon of _____________________?

supply of excess, air

fuel bed firing

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

supply of excess coal

10 / 50

The efficiency of jet engine is__________________?

higher at ground

same at all altitudes

higher at high speed

higher at high altitudes

11 / 50

The unit of Young?s modulus is__________________?

kg/cm

kg/cm2

mm/mm

12 / 50

A stoichiometric air-fuel ratio is______________________?

lean mixture

chemically correct mixture

rich mixture for idling

rich mixture for over loads

13 / 50

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

evaporator

condenser

expansion valve

compressor

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

early start

late finish

late start

15 / 50

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

volumetric efficiency

isothermal efficiency

mechanical efficiency

compressor efficiency

16 / 50

PERT has following time estimate_________________?

one time estimate

three time estimate

four time estimate

two time estimate

17 / 50

Volumetric efficiency of a compressor with clearance volume ________________?

decreases with increase in compression ratio

may increase/decrease depending on compressor capacity

in not dependent upon compression ratio

increases with increase in compression ratio

18 / 50

Manometer is used to measure__________________?

pressure in pipes, channels etc

atmospheric pressure

very low pressure

difference of pressure between two points

19 / 50

Preheating is essential in welding ___________________?

cast iron

all non-ferrous materials

high speed steel

all of the above

20 / 50

In nuclear fission___________________?

the electrons of the element change

none of the above

the original elements change into completely different elements

the molecules rearrange themselves to form other molecules

21 / 50

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

0.45

0.55

0.25

0.75

22 / 50

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

constitute a couple

balance each other

constitute a moment of couple

constitute a moment

23 / 50

Gear box is used___________________?

to obtain variable speeds

to produce torque

to increase efficiency of system

for speed reduction

24 / 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

25 / 50

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

liquid fuel and air

liquid fuel only

solid fuel

solid fuel and air

26 / 50

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

remains same

first increases and then decreases

increases

decreases

27 / 50

Fire tube boilers are those in which__________________?

water passes through the tubes and flue gases around it

tubes are laid vertically

forced circulation takes place

flue gases pass through tubes and water around it

28 / 50

Solder is an alloy consisting of________________?

tin, antimony, copper

tin and lead

lead and zinc

tin and copper

29 / 50

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

0.01

0.02

0.1

0.002

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

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

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

31 / 50

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

7.8 MeV

4.3 MeV

2.4 MeV

1 MeV

32 / 50

?Killed steels? are those steels__________________?

which are destroyed by burning

which are deoxidised in the ladle with silicon and aluminium

which after their destruction are recycled to produce fresh steel

in which carbon is completely burnt

33 / 50

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

alpha methyl napthalene

mixture of methane and ethane

mixture of normal heptane and iso-oc-tane

iso-octane

34 / 50

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

iron

nickel

vanadium

cobalt

35 / 50

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

36 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant volume

constant pressure

constant enthaply

constant temperature

37 / 50

Volatility of diesel fuel oil is_________________?

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

it catches fire without external aid

temperature at which it solidifies or congeals

38 / 50

Boiling water reactor employs__________________?

direct cycle of coolant system

multi pass system

boiler

double circuit system of coolant cycle

39 / 50

A file removes the metal during___________________?

none of these

forward stroke

return stroke

both forward and return strokes

40 / 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

for safety of turbine

to increase flow rate

41 / 50

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

1500 VPN

600 VPN

1000 to 1100 VPN

250 VPN

42 / 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

more heating surface

equal heating surface

less heating surface

43 / 50

Which of the following particles is the lightest__________________?

electron

nucleus

meson

proton

44 / 50

Which is correct statement ?

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

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

45 / 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

46 / 50

Joule sec is the unit of_________________?

Planck?s constant

kinematic viscosity

thermal conductivity

universal gas constant

47 / 50

Job enrichment technique is applied to_________________?

reduce labour monotony

overcome boring and demotivating work

make people happy

all of the above

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/?2/2

pco2/?2

2pa2R2

pa2R/2

49 / 50

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

flow is uniform and steady

process is isothermal

process is isentropic and specific heat does not change with temperature

process is isentropic

50 / 50

The number of drums in Benson steam generator is_________________?

one

two

one steam drum and one water drum

no drum

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