Mechanical Engineering Quiz 17

1 / 50

Joule sec is the unit of_________________?

universal gas constant

thermal conductivity

Planck?s constant

kinematic viscosity

2 / 50

A stoichiometric air-fuel ratio is______________________?

lean mixture

chemically correct mixture

rich mixture for idling

rich mixture for over loads

3 / 50

Preheating is essential in welding ___________________?

all of the above

high speed steel

all non-ferrous materials

cast iron

4 / 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

late start

early start

5 / 50

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

6 / 50

Which is correct statement ?

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

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

7 / 50

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

0.55

0.25

0.75

0.45

8 / 50

PERT has following time estimate_________________?

four time estimate

three time estimate

one time estimate

two time estimate

9 / 50

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

constitute a moment of couple

balance each other

constitute a couple

constitute a moment

10 / 50

Brass contains___________________?

70% copper and 30% zinc

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

70-75% copper and rest tin

90% copper and 10% tin

11 / 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

increases

decreases

12 / 50

The unit of Young?s modulus is__________________?

kg/cm

mm/mm

kg/cm2

13 / 50

A file removes the metal during___________________?

both forward and return strokes

none of these

forward stroke

return stroke

14 / 50

Volumetric efficiency of a compressor with clearance volume ________________?

in not dependent upon compression ratio

may increase/decrease depending on compressor capacity

increases with increase in compression ratio

decreases with increase in compression ratio

15 / 50

Split nut is a locking device in which_________________?

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

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

16 / 50

Manometer is used to measure__________________?

atmospheric pressure

very low pressure

pressure in pipes, channels etc

difference of pressure between two points

17 / 50

The efficiency of jet engine is__________________?

higher at high speed

higher at high altitudes

higher at ground

same at all altitudes

18 / 50

The number of drums in Benson steam generator is_________________?

two

one steam drum and one water drum

no drum

one

19 / 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

20 / 50

In a Carnot cycle, heat is transferred at_______________________?

constant enthaply

constant volume

constant pressure

constant temperature

21 / 50

The resultant of all normal pressures acts___________________?

vertically upwards

at center of pressure

at e.g. of body

at metacentre

22 / 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

23 / 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

24 / 50

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

7.8 MeV

1 MeV

4.3 MeV

2.4 MeV

25 / 50

Volatility of diesel fuel oil is_________________?

temperature at which it solidifies or congeals

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

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

26 / 50

Which of the following particles is the lightest__________________?

electron

meson

proton

nucleus

27 / 50

Fire tube boilers are those in which__________________?

water passes through the tubes and flue gases around it

flue gases pass through tubes and water around it

forced circulation takes place

tubes are laid vertically

28 / 50

Bar charts are suitable for_____________________?

all of the above

large projects

major works

minor works

29 / 50

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

0.002

0.02

0.1

0.01

30 / 50

In reaction turbine, draft tube is used_____________________?

for safety of turbine

to transport water downstream without eddies

to increase flow rate

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

31 / 50

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

mixture of normal heptane and iso-oc-tane

mixture of methane and ethane

iso-octane

alpha methyl napthalene

32 / 50

Medium specific speea of turbine implies it is___________________?

propeller turbine

impulse turbine

Francis turbine

any one of the above

33 / 50

Hardness of upper bainite (acicular structure) is about___________________?

RC 57

RC 80

RC 65

RC 48

34 / 50

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

evaporator

expansion valve

compressor

condenser

35 / 50

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

solid fuel and air

liquid fuel only

liquid fuel and air

solid fuel

36 / 50

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

less

more/less depending on rating

same

37 / 50

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

storm

cold wave

rains

fine weather

38 / 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

39 / 50

Boiling water reactor employs__________________?

boiler

direct cycle of coolant system

multi pass system

double circuit system of coolant cycle

40 / 50

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

1000 to 1100 VPN

600 VPN

1500 VPN

250 VPN

41 / 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

more inclined when moving

less inclined when moving

less inclined when standing

42 / 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

increase cooling effect

reduce compressor discharge temperature

reduce compressor overheating

43 / 50

Overfire burning is the phenomenon of _____________________?

supply of excess coal

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

fuel bed firing

supply of excess, air

44 / 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

45 / 50

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

iron

cobalt

nickel

vanadium

46 / 50

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

equal heating surface

less heating surface

more heating surface

heating surface depends on other parameters

47 / 50

Job enrichment technique is applied to_________________?

make people happy

reduce labour monotony

all of the above

overcome boring and demotivating work

48 / 50

Solder is an alloy consisting of________________?

tin and lead

lead and zinc

tin and copper

tin, antimony, copper

49 / 50

Gear box is used___________________?

to obtain variable speeds

for speed reduction

to increase efficiency of system

to produce torque

50 / 50

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

isothermal efficiency

mechanical efficiency

compressor efficiency

volumetric efficiency

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 67%