Mechanical Engineering Quiz 8

1 / 50

According to Avogadro?s Hypothesis ______________________?

the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

product of the gas constant and the molecular weight of an ideal gas is constant

the sum of partial pressure of mixture of two gases is sum of the two

gases have two values of specific heat

2 / 50

Work study is concerned with_________________?

motivation of workers

improving present method and finding standard time

improving production capability

improving production planning and control

3 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the methods of proper utilization of machines

the flow of material in the plant

the methods of proper utilization of manpower

4 / 50

Steel made from phosphatic iron is_________________?

tough

ductile

brittle

hard

5 / 50

A key capable of tilting in a recess milled out in a shaft is known as______________________?

gib head key

flat saddle key

feather key

wood-ruff key

6 / 50

Time study is__________________?

the appraisal, in terms of time, of the value of work involving human effort

machine setting time

method of fixing time for workers

time taken by workers to do a job

7 / 50

Critical Path Net Work helps an engineer_________________?

to divert the resources from non-critical advanced activities to critical activities

to be cautious for avoiding any delay in the critical activities to avoid delay of the whole project

all of the above

to concentrate his attention on critical activities

8 / 50

The knock in diesel engine occurs due to____________________?

reduction of delay period

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

instantaneous atuo iginition of last part of charge

9 / 50

Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?

less power requirement

less loss of air due to leakage past the cylinder

better mechanical balance

lower volumetric efficiency

10 / 50

The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________?

circle

square

equilateral triangle

right angled triangle

11 / 50

Water and sediment in fuel oil can be removed by _______________________?

heating the oil in the settling tanks

suspension

cooling the oil in the settling tanks

burning the oil

12 / 50

The ratio of absolute viscosity to mass density is known as_________________?

kinematic viscosity

coefficient of viscosity

specific viscosity

viscosity index

13 / 50

During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?

22 tonnes/cm2

4 tonnes/cm2

8 tonnes/cm2

16 tonnes/cm2

14 / 50

The draw of cotter need not exceed_________________?

3 mm

10 mm

5 mm

20 mm

15 / 50

A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t ? 4), the acceleration of the particle will be given by the equation __________________?

6f-4

6f-8

3t2-lt

3t2+2t

16 / 50

Heat flows from one body to other when they have_________________?

different heat contents

different specific heat

different atomic structure

different temperatures

17 / 50

Micro motion study is__________________?

motion study of a sequence of operations conducted systematically

motion study* observed on enhanced time intervals

study of man and machine conducted simultaneously

analysis of a man-work method by using a motion picture camera with a timing device in the field of view

18 / 50

If n = number of members andy = number of joints, then for a perfect frame, n =________________?

3/-2

2j-l

j-2

2/-3

19 / 50

Combustion in compression ignition engines is____________________?

laminar

None

heterogeneous

homogeneous

20 / 50

Capillary action is due to the_________________?

adhesion of the liquid molecules and the molecules on the surface of a solid

all of the above

cohesion of the liquid

surface tension

21 / 50

The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________?

yielding point of the material

breaking point of the material

plastic point of the material

elastic point of the material

22 / 50

Detonation is caused by the following unstable compounds______________________?

ketones and sulphur compounds

aldehydes, oxides and ketones

peroxides, aldehydes, oxides and sul-phides

peroxides, aldehydes and ketones

23 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.10%

0.60%

0.40%

24 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

plutonium

thorium

25 / 50

Molecular volume of any perfect gas at 600 x 103 N/m2 and 27?C will be ____________________?

0.15 m3/kg mol

4.17m3/kgmol

41.7 m3/kg mol

400 m3/kg mol

26 / 50

A large Roynold number is indication of________________?

smooth and streamline flow

highly turbulent flow

laminar flow

steady flow

27 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.1 to 0.2%

0.6 to 0.7%

0.7 to 0.9%

28 / 50

Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________?

completely reversed loading

combined static and dynamic loading

dynamic loading

static loading

29 / 50

Density of water is maximum at__________________?

4?C

0?C

0?K

100?C

30 / 50

The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?

may increase or decrease depending on the type of refrigerant used

decrease

increase

remain unaffected

31 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

minimum pressure

average pressure

instantaneous pressure at any instant

maximum pressure developed

32 / 50

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_________________?

force of adhesion

force of cohesion

force of diffusion

force of friction

33 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 80

SAE 4?

SAE 50

34 / 50

Which of the following depreciation system ensures that the interest be charged on the cost of machine asset every year on the book value, but the rate of depreciation every year remains constant_____________________?

A-B-C charging method

straight line method

sinking fund method

annuity charging method

35 / 50

A nuclear unit becoming critical means_______________?

chain reaction that causes automatic splitting of the fuel nuclei has been established

it is generating power to rated capacity

there is danger of nuclear spread

it is capable of generating much more than rated capacity

36 / 50

An example of amorphous material is____________?

glass

silver

lead

zinc

37 / 50

The compression ratio in a jet engine varies proportional to ____________________?

Vspeed

altitude

speed

38 / 50

The main advantage of line organisation is its_______________?

defined responsibilities at all levels

rigid discipline in the organisation

all of the above

effective command and control

39 / 50

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

Brine

Freon

Carbon dioxide

Ammonia

40 / 50

Mach number is significant in_____________________?

all of fhe above

supersonics, as with projectiles and jet propulsion

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship?s hulls

full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

41 / 50

A chain comprises of 5 links having 5 joints. Is it kinematic chain ?

data are insufficient to determine it

yes

it is a marginal case

42 / 50

Work done is zero for the following process_________________?

all Of the above

constant volume

free expansion

throttling

43 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

m.e.p. and I.H.P.

temperature

speed

44 / 50

Presence of moisture in a refrigerant affects the working of___________________?

condenser

expansion valve

evaparator

compressor

45 / 50

A two stroke crank compressed engine has following ports in the cylinder_______________?

suction port and transfer port

suction port and exhaust port

suction port, exhaust port and transfer port

transfer port only

46 / 50

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?

N/Zp

p/ZN

ZN/p

Z/pN

47 / 50

The difference of pressure between the inside and outside of a liquid drop is _______________?

p = T/r

p = T/2r

p = Txr

p = 2T/r

48 / 50

Antifriction bearings are__________________?

sleeve bearings

none of the above

thin lubricated bearings

hydrodynamic bearings

49 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant pressure

Higher calorific value at constant volume

Lower calorific value at constant pressure

Lower calorific value at constant volume ,

50 / 50

String diagram is used when__________________?

all of the above

idle time is to be reduced

material handling is to be done

team of workers is working at a place

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