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________________?

completely reversed loading

combined static and dynamic loading

static loading

dynamic loading

2 / 50

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

remain unaffected

decrease

may increase or decrease depending on the type of refrigerant used

increase

3 / 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

ZN/p

p/ZN

N/Zp

4 / 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

400 m3/kg mol

0.15 m3/kg mol

5 / 50

Density of water is maximum at__________________?

100?C

0?K

4?C

0?C

6 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

instantaneous pressure at any instant

minimum pressure

maximum pressure developed

average pressure

7 / 50

An example of amorphous material is____________?

glass

zinc

silver

lead

8 / 50

The draw of cotter need not exceed_________________?

3 mm

20 mm

10 mm

5 mm

9 / 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

10 / 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

Carbon dioxide

Ammonia

Freon

11 / 50

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

altitude

speed

Vspeed

speed

12 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

reduction of delay period

13 / 50

Critical Path Net Work helps an engineer_________________?

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

all of the above

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

14 / 50

Time study is__________________?

time taken by workers to do a job

method of fixing time for workers

machine setting time

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

15 / 50

A nuclear unit becoming critical means_______________?

there is danger of nuclear spread

it is generating power to rated capacity

it is capable of generating much more than rated capacity

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

16 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.20%

0.40%

0.60%

17 / 50

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

less power requirement

better mechanical balance

less loss of air due to leakage past the cylinder

lower volumetric efficiency

18 / 50

Work done is zero for the following process_________________?

free expansion

constant volume

all Of the above

throttling

19 / 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 ,

20 / 50

According to Avogadro?s Hypothesis ______________________?

gases have two values of specific heat

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

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

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

21 / 50

A large Roynold number is indication of________________?

laminar flow

highly turbulent flow

steady flow

smooth and streamline flow

22 / 50

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

force of diffusion

force of friction

force of cohesion

force of adhesion

23 / 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

elastic point of the material

breaking point of the material

plastic point of the material

24 / 50

Antifriction bearings are__________________?

none of the above

sleeve bearings

hydrodynamic bearings

thin lubricated bearings

25 / 50

An engine indicator is used to determine the following___________________?

speed

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

volume of cylinder

temperature

26 / 50

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

p = T/r

p = Txr

p = T/2r

p = 2T/r

27 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different temperatures

different heat contents

different specific heat

28 / 50

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

viscosity index

coefficient of viscosity

specific viscosity

kinematic viscosity

29 / 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

30 / 50

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

2j-l

j-2

3/-2

2/-3

31 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the flow of material in the plant

the methods of proper utilization of machines

the methods of proper utilization of manpower

32 / 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

33 / 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

8 tonnes/cm2

16 tonnes/cm2

4 tonnes/cm2

34 / 50

Drop forging dies contain carbon of the order of_________________?

0.6 to 0.7%

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

35 / 50

String diagram is used when__________________?

idle time is to be reduced

material handling is to be done

team of workers is working at a place

all of the above

36 / 50

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

it is a marginal case

yes

data are insufficient to determine it

37 / 50

Steel made from phosphatic iron is_________________?

hard

ductile

brittle

tough

38 / 50

Combustion in compression ignition engines is____________________?

heterogeneous

laminar

None

homogeneous

39 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

motion study* observed on enhanced time intervals

motion study of a sequence of operations conducted systematically

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

40 / 50

Presence of moisture in a refrigerant affects the working of___________________?

expansion valve

evaparator

compressor

condenser

41 / 50

A boiling water reactor uses following as fuel________________?

plutonium

thorium

enriched uranium

42 / 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

43 / 50

Detonation is caused by the following unstable compounds______________________?

aldehydes, oxides and ketones

ketones and sulphur compounds

peroxides, aldehydes and ketones

peroxides, aldehydes, oxides and sul-phides

44 / 50

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

transfer port only

suction port, exhaust port and transfer port

suction port and transfer port

suction port and exhaust port

45 / 50

The main advantage of line organisation is its_______________?

effective command and control

all of the above

rigid discipline in the organisation

defined responsibilities at all levels

46 / 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

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

supersonics, as with projectiles and jet propulsion

all of fhe above

47 / 50

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

burning the oil

cooling the oil in the settling tanks

suspension

heating the oil in the settling tanks

48 / 50

Work study is concerned with_________________?

improving present method and finding standard time

improving production planning and control

motivation of workers

improving production capability

49 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 4?

SAE 80

SAE 50

50 / 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

3t2+2t

6f-4

6f-8

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