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

completely reversed loading

combined static and dynamic loading

dynamic loading

2 / 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________________?

p/ZN

N/Zp

ZN/p

Z/pN

3 / 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

4 / 50

Antifriction bearings are__________________?

hydrodynamic bearings

sleeve bearings

none of the above

thin lubricated bearings

5 / 50

The knock in diesel engine occurs due to____________________?

reduction of delay period

instantaneous and rapid burning of the first part of the charge

instantaneous atuo iginition of last part of charge

delayed burning of the first part of the charge

6 / 50

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

transfer port only

suction port and exhaust port

suction port and transfer port

suction port, exhaust port and transfer port

7 / 50

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

yes

data are insufficient to determine it

it is a marginal case

8 / 50

Drop forging dies contain carbon of the order of_________________?

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

9 / 50

Critical Path Net Work helps an engineer_________________?

all of the above

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

to concentrate his attention on critical activities

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

10 / 50

A nuclear unit becoming critical means_______________?

there is danger of nuclear spread

it is generating power to rated capacity

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

it is capable of generating much more than rated capacity

11 / 50

Steel made from phosphatic iron is_________________?

ductile

hard

tough

brittle

12 / 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

13 / 50

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

force of cohesion

force of friction

force of diffusion

force of adhesion

14 / 50

A boiling water reactor uses following as fuel________________?

plutonium

thorium

enriched uranium

15 / 50

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

kinematic viscosity

coefficient of viscosity

specific viscosity

viscosity index

16 / 50

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

j-2

2j-l

2/-3

3/-2

17 / 50

Work study is concerned with_________________?

improving production planning and control

improving present method and finding standard time

motivation of workers

improving production capability

18 / 50

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

heating the oil in the settling tanks

burning the oil

suspension

cooling the oil in the settling tanks

19 / 50

Time study is__________________?

time taken by workers to do a job

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

machine setting time

method of fixing time for workers

20 / 50

Micro motion study is__________________?

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

motion study of a sequence of operations conducted systematically

21 / 50

Capillary action is due to the_________________?

all of the above

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

surface tension

cohesion of the liquid

22 / 50

String diagram is used when__________________?

all of the above

team of workers is working at a place

idle time is to be reduced

material handling is to be done

23 / 50

Density of water is maximum at__________________?

4?C

0?K

100?C

0?C

24 / 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___________________?

4 tonnes/cm2

22 tonnes/cm2

8 tonnes/cm2

16 tonnes/cm2

25 / 50

Combustion in compression ignition engines is____________________?

homogeneous

laminar

heterogeneous

None

26 / 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

27 / 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

28 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

average pressure

minimum pressure

instantaneous pressure at any instant

29 / 50

A large Roynold number is indication of________________?

highly turbulent flow

laminar flow

steady flow

smooth and streamline flow

30 / 50

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

p = T/r

p = 2T/r

p = T/2r

p = Txr

31 / 50

An example of amorphous material is____________?

lead

silver

glass

zinc

32 / 50

An engine indicator is used to determine the following___________________?

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

speed

temperature

volume of cylinder

33 / 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 __________________?

3t2-lt

6f-4

3t2+2t

6f-8

34 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.20%

0.60%

0.40%

35 / 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

36 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant pressure

Higher calorific value at constant volume

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

37 / 50

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

4.17m3/kgmol

41.7 m3/kg mol

0.15 m3/kg mol

400 m3/kg mol

38 / 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

annuity charging method

sinking fund method

A-B-C charging method

39 / 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.

40 / 50

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

gib head key

wood-ruff key

flat saddle key

feather key

41 / 50

The draw of cotter need not exceed_________________?

5 mm

3 mm

10 mm

20 mm

42 / 50

The main advantage of line organisation is its_______________?

rigid discipline in the organisation

effective command and control

all of the above

defined responsibilities at all levels

43 / 50

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

altitude

Vspeed

speed

44 / 50

Which is more viscous lub oil_________________?

SAE 80

SEA 30

SAE 4?

SAE 50

45 / 50

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

less power requirement

better mechanical balance

lower volumetric efficiency

less loss of air due to leakage past the cylinder

46 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

compressor

condenser

expansion valve

47 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the methods of proper utilization of manpower

the flow of material in the plant

the methods of proper utilization of machines

48 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different temperatures

different specific heat

different heat contents

49 / 50

Work done is zero for the following process_________________?

constant volume

throttling

free expansion

all Of the above

50 / 50

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

right angled triangle

equilateral triangle

circle

square

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