Mechanical Engineering Quiz 8

1 / 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________________?

static loading

dynamic loading

completely reversed loading

combined static and dynamic loading

2 / 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

16 tonnes/cm2

4 tonnes/cm2

8 tonnes/cm2

3 / 50

Capillary action is due to the_________________?

surface tension

all of the above

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

cohesion of the liquid

4 / 50

Density of water is maximum at__________________?

4?C

100?C

0?K

0?C

5 / 50

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

heating the oil in the settling tanks

cooling the oil in the settling tanks

suspension

burning the oil

6 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

compressor

expansion valve

condenser

7 / 50

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

increase

remain unaffected

may increase or decrease depending on the type of refrigerant used

decrease

8 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

instantaneous pressure at any instant

minimum pressure

maximum pressure developed

average pressure

9 / 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________________?

Z/pN

p/ZN

ZN/p

N/Zp

10 / 50

Mach number is significant in_____________________?

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

all of fhe above

supersonics, as with projectiles and jet propulsion

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

11 / 50

Work done is zero for the following process_________________?

throttling

constant volume

all Of the above

free expansion

12 / 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+2t

3t2-lt

13 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different atomic structure

different heat contents

different temperatures

14 / 50

Combustion in compression ignition engines is____________________?

homogeneous

None

laminar

heterogeneous

15 / 50

String diagram is used when__________________?

team of workers is working at a place

all of the above

material handling is to be done

idle time is to be reduced

16 / 50

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

lower volumetric efficiency

less loss of air due to leakage past the cylinder

less power requirement

better mechanical balance

17 / 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_____________________?

straight line method

sinking fund method

A-B-C charging method

annuity charging method

18 / 50

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

suction port and exhaust port

transfer port only

suction port and transfer port

suction port, exhaust port and transfer port

19 / 50

Drop forging dies contain carbon of the order of_________________?

0.1 to 0.2%

0.6 to 0.7%

0.7 to 0.9%

0.25 to 0.5%

20 / 50

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

p = Txr

p = T/2r

p = 2T/r

p = T/r

21 / 50

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

41.7 m3/kg mol

400 m3/kg mol

0.15 m3/kg mol

4.17m3/kgmol

22 / 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

23 / 50

Work study is concerned with_________________?

improving present method and finding standard time

improving production planning and control

motivation of workers

improving production capability

24 / 50

Steel made from phosphatic iron is_________________?

brittle

hard

tough

ductile

25 / 50

The knock in diesel engine occurs due to____________________?

instantaneous and rapid burning of the first part of the charge

reduction of delay period

instantaneous atuo iginition of last part of charge

delayed burning of the first part of the charge

26 / 50

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

feather key

flat saddle key

wood-ruff key

gib head key

27 / 50

An engine indicator is used to determine the following___________________?

temperature

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

speed

volume of cylinder

28 / 50

The main advantage of line organisation is its_______________?

effective command and control

defined responsibilities at all levels

rigid discipline in the organisation

all of the above

29 / 50

Time study is__________________?

method of fixing time for workers

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

time taken by workers to do a job

machine setting time

30 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 50

SAE 4?

SAE 80

31 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.60%

0.20%

0.40%

32 / 50

The draw of cotter need not exceed_________________?

20 mm

5 mm

10 mm

3 mm

33 / 50

An example of amorphous material is____________?

glass

lead

silver

zinc

34 / 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________________?

Ammonia

Brine

Carbon dioxide

Freon

35 / 50

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

viscosity index

kinematic viscosity

specific viscosity

coefficient of viscosity

36 / 50

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

2j-l

2/-3

3/-2

j-2

37 / 50

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

yes

it is a marginal case

data are insufficient to determine it

38 / 50

A boiling water reactor uses following as fuel________________?

plutonium

thorium

enriched uranium

39 / 50

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

equilateral triangle

circle

square

right angled triangle

40 / 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 diffusion

force of cohesion

force of friction

41 / 50

A large Roynold number is indication of________________?

highly turbulent flow

smooth and streamline flow

steady flow

laminar flow

42 / 50

Antifriction bearings are__________________?

none of the above

hydrodynamic bearings

sleeve bearings

thin lubricated bearings

43 / 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

44 / 50

A nuclear unit becoming critical means_______________?

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

there is danger of nuclear spread

it is capable of generating much more than rated capacity

it is generating power to rated capacity

45 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

gases have two values of specific heat

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

46 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of manpower

the layout of factory facilities

the methods of proper utilization of machines

the flow of material in the plant

47 / 50

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

breaking point of the material

plastic point of the material

yielding point of the material

elastic point of the material

48 / 50

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

altitude

speed

Vspeed

speed

49 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant volume ,

Higher calorific value at constant volume

Lower calorific value at constant pressure

Higher calorific value at constant pressure

50 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

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