Mechanical Engineering Quiz 8

1 / 50

The draw of cotter need not exceed_________________?

10 mm

3 mm

20 mm

5 mm

2 / 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

3 / 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_____________________?

annuity charging method

sinking fund method

straight line method

A-B-C charging method

4 / 50

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

4.17m3/kgmol

400 m3/kg mol

41.7 m3/kg mol

0.15 m3/kg mol

5 / 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___________________?

8 tonnes/cm2

16 tonnes/cm2

22 tonnes/cm2

4 tonnes/cm2

6 / 50

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

flat saddle key

wood-ruff key

feather key

gib head key

7 / 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

8 / 50

Routing assists engineers in deciding in advance___________________?

the flow of material in the plant

the methods of proper utilization of manpower

the methods of proper utilization of machines

the layout of factory facilities

9 / 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________________?

Carbon dioxide

Ammonia

Brine

Freon

10 / 50

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

suction port and transfer port

suction port and exhaust port

transfer port only

suction port, exhaust port and transfer port

11 / 50

Density of water is maximum at__________________?

0?K

0?C

100?C

4?C

12 / 50

Combustion in compression ignition engines is____________________?

None

homogeneous

laminar

heterogeneous

13 / 50

The main advantage of line organisation is its_______________?

defined responsibilities at all levels

effective command and control

all of the above

rigid discipline in the organisation

14 / 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

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

gases have two values of specific heat

15 / 50

Antifriction bearings are__________________?

sleeve bearings

thin lubricated bearings

hydrodynamic bearings

none of the above

16 / 50

Steel made from phosphatic iron is_________________?

brittle

ductile

hard

tough

17 / 50

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

j-2

3/-2

2j-l

2/-3

18 / 50

A boiling water reactor uses following as fuel________________?

thorium

enriched uranium

plutonium

19 / 50

String diagram is used when__________________?

material handling is to be done

all of the above

team of workers is working at a place

idle time is to be reduced

20 / 50

A large Roynold number is indication of________________?

smooth and streamline flow

steady flow

highly turbulent flow

laminar flow

21 / 50

A nuclear unit becoming critical means_______________?

it is generating power to rated capacity

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

22 / 50

Which is more viscous lub oil_________________?

SAE 50

SEA 30

SAE 4?

SAE 80

23 / 50

Mach number is significant in_____________________?

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

supersonics, as with projectiles and jet propulsion

all of fhe above

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

24 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

motion study of a sequence of operations conducted systematically

motion study* observed on enhanced time intervals

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

25 / 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

26 / 50

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

p = Txr

p = T/r

p = 2T/r

p = T/2r

27 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.60%

0.40%

0.10%

28 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different atomic structure

different heat contents

different specific heat

29 / 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

30 / 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

31 / 50

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

better mechanical balance

lower volumetric efficiency

less power requirement

less loss of air due to leakage past the cylinder

32 / 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 adhesion

force of diffusion

33 / 50

An example of amorphous material is____________?

glass

zinc

silver

lead

34 / 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

35 / 50

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

altitude

speed

Vspeed

speed

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

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

instantaneous pressure at any instant

minimum pressure

average pressure

38 / 50

Capillary action is due to the_________________?

surface tension

all of the above

cohesion of the liquid

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

39 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

reduction of delay period

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

40 / 50

Work done is zero for the following process_________________?

constant volume

free expansion

all Of the above

throttling

41 / 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

42 / 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

ZN/p

Z/pN

p/ZN

43 / 50

Work study is concerned with_________________?

motivation of workers

improving production planning and control

improving production capability

improving present method and finding standard time

44 / 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

45 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

evaparator

expansion valve

condenser

46 / 50

Drop forging dies contain carbon of the order of_________________?

0.7 to 0.9%

0.1 to 0.2%

0.6 to 0.7%

0.25 to 0.5%

47 / 50

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

decrease

may increase or decrease depending on the type of refrigerant used

remain unaffected

increase

48 / 50

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

specific viscosity

viscosity index

coefficient of viscosity

kinematic viscosity

49 / 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

plastic point of the material

breaking point of the material

elastic point of the material

50 / 50

An engine indicator is used to determine the following___________________?

speed

temperature

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

volume of cylinder

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