Mechanical Engineering Quiz 17

1 / 50

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

1500 VPN

1000 to 1100 VPN

600 VPN

250 VPN

2 / 50

An optimum project schedule implies_______________?

timely execution of project

lowest possible cost and shortest possible time for project

optimum utilization of men, machines and materials

to produce best results under given constraints

3 / 50

A file removes the metal during___________________?

return stroke

both forward and return strokes

forward stroke

none of these

4 / 50

Volumetric efficiency of a compressor with clearance volume ________________?

decreases with increase in compression ratio

in not dependent upon compression ratio

may increase/decrease depending on compressor capacity

increases with increase in compression ratio

5 / 50

The efficiency of jet engine is__________________?

higher at high altitudes

same at all altitudes

higher at high speed

higher at ground

6 / 50

The number of drums in Benson steam generator is_________________?

one steam drum and one water drum

two

one

no drum

7 / 50

In nuclear fission___________________?

the molecules rearrange themselves to form other molecules

none of the above

the original elements change into completely different elements

the electrons of the element change

8 / 50

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

0.02

0.002

0.01

0.1

9 / 50

Joule sec is the unit of_________________?

kinematic viscosity

Planck?s constant

universal gas constant

thermal conductivity

10 / 50

Brass contains___________________?

70% copper and 30% zinc

90% copper and 10% tin

70-75% copper and rest tin

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

11 / 50

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

mixture of normal heptane and iso-oc-tane

iso-octane

alpha methyl napthalene

mixture of methane and ethane

12 / 50

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

13 / 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

0.25

0.75

0.55

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 finish

early start

late start

early finish

15 / 50

Job enrichment technique is applied to_________________?

all of the above

overcome boring and demotivating work

reduce labour monotony

make people happy

16 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant pressure

constant temperature

constant volume

constant enthaply

17 / 50

Preheating is essential in welding ___________________?

all of the above

cast iron

all non-ferrous materials

high speed steel

18 / 50

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

expansion valve

evaporator

condenser

compressor

19 / 50

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

process is isothermal

flow is uniform and steady

process is isentropic

process is isentropic and specific heat does not change with temperature

20 / 50

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

reduce compressor discharge temperature

increase cooling effect

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

reduce compressor overheating

21 / 50

Solder is an alloy consisting of________________?

tin, antimony, copper

tin and lead

tin and copper

lead and zinc

22 / 50

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

remains same

decreases

increases

first increases and then decreases

23 / 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

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

24 / 50

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

equal heating surface

heating surface depends on other parameters

more heating surface

less heating surface

25 / 50

Medium specific speea of turbine implies it is___________________?

any one of the above

impulse turbine

Francis turbine

propeller turbine

26 / 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

27 / 50

?Killed steels? are those steels__________________?

in which carbon is completely burnt

which after their destruction are recycled to produce fresh steel

which are destroyed by burning

which are deoxidised in the ladle with silicon and aluminium

28 / 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

29 / 50

In reaction turbine, draft tube is used_____________________?

to transport water downstream without eddies

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

for safety of turbine

to increase flow rate

30 / 50

Boiling water reactor employs__________________?

direct cycle of coolant system

multi pass system

double circuit system of coolant cycle

boiler

31 / 50

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

volumetric efficiency

compressor efficiency

isothermal efficiency

mechanical efficiency

32 / 50

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

cobalt

iron

vanadium

nickel

33 / 50

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

solid fuel and air

liquid fuel and air

liquid fuel only

solid fuel

34 / 50

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

storm

rains

fine weather

cold wave

35 / 50

PERT has following time estimate_________________?

two time estimate

four time estimate

three time estimate

one time estimate

36 / 50

Bar charts are suitable for_____________________?

large projects

minor works

major works

all of the above

37 / 50

Manometer is used to measure__________________?

very low pressure

atmospheric pressure

difference of pressure between two points

pressure in pipes, channels etc

38 / 50

Overfire burning is the phenomenon of _____________________?

supply of excess coal

supply of excess, air

fuel bed firing

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

39 / 50

Volatility of diesel fuel oil is_________________?

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

it catches fire without external aid

40 / 50

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

less inclined when standing

more inclined when standing

less inclined when moving

more inclined when moving

41 / 50

The unit of Young?s modulus is__________________?

mm/mm

kg/cm2

kg/cm

42 / 50

Which of the following particles is the lightest__________________?

electron

proton

meson

nucleus

43 / 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

44 / 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

45 / 50

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

1 MeV

7.8 MeV

2.4 MeV

4.3 MeV

46 / 50

Gear box is used___________________?

for speed reduction

to produce torque

to increase efficiency of system

to obtain variable speeds

47 / 50

The resultant of all normal pressures acts___________________?

at metacentre

vertically upwards

at center of pressure

at e.g. of body

48 / 50

A stoichiometric air-fuel ratio is______________________?

lean mixture

rich mixture for over loads

chemically correct mixture

rich mixture for idling

49 / 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

50 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 80

RC 57

RC 65

RC 48

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 67%