Mechanical Engineering Quiz 8

1 / 50

Antifriction bearings are__________________?

none of the above

sleeve bearings

hydrodynamic bearings

thin lubricated bearings

2 / 50

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

burning the oil

heating the oil in the settling tanks

suspension

cooling the oil in the settling tanks

3 / 50

The draw of cotter need not exceed_________________?

20 mm

10 mm

3 mm

5 mm

4 / 50

Drop forging dies contain carbon of the order of_________________?

0.7 to 0.9%

0.25 to 0.5%

0.1 to 0.2%

0.6 to 0.7%

5 / 50

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

data are insufficient to determine it

it is a marginal case

yes

6 / 50

Work done is zero for the following process_________________?

all Of the above

free expansion

constant volume

throttling

7 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.40%

0.60%

0.10%

0.20%

8 / 50

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

viscosity index

kinematic viscosity

coefficient of viscosity

specific viscosity

9 / 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________________?

dynamic loading

completely reversed loading

static loading

combined static and dynamic loading

10 / 50

Critical Path Net Work helps an engineer_________________?

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

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

to concentrate his attention on critical activities

all of the above

11 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

minimum pressure

instantaneous pressure at any instant

average pressure

12 / 50

A nuclear unit becoming critical means_______________?

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

it is capable of generating much more than rated capacity

there is danger of nuclear spread

it is generating power to rated capacity

13 / 50

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

Vspeed

speed

altitude

speed

14 / 50

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

suction port and exhaust port

suction port, exhaust port and transfer port

transfer port only

suction port and transfer port

15 / 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________________?

ZN/p

N/Zp

p/ZN

Z/pN

16 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes, oxides and sul-phides

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

ketones and sulphur compounds

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

A large Roynold number is indication of________________?

laminar flow

steady flow

highly turbulent flow

smooth and streamline flow

19 / 50

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

41.7 m3/kg mol

4.17m3/kgmol

0.15 m3/kg mol

400 m3/kg mol

20 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

Lower calorific value at constant pressure

Higher calorific value at constant volume

21 / 50

Steel made from phosphatic iron is_________________?

hard

brittle

tough

ductile

22 / 50

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

equilateral triangle

right angled triangle

circle

square

23 / 50

Density of water is maximum at__________________?

100?C

0?C

0?K

4?C

24 / 50

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

2j-l

3/-2

2/-3

j-2

25 / 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

Freon

Brine

Ammonia

26 / 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

27 / 50

Time study is__________________?

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

time taken by workers to do a job

method of fixing time for workers

machine setting time

28 / 50

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

elastic point of the material

plastic point of the material

yielding point of the material

breaking point of the material

29 / 50

A boiling water reactor uses following as fuel________________?

thorium

enriched uranium

plutonium

30 / 50

Which is more viscous lub oil_________________?

SAE 4?

SAE 50

SAE 80

SEA 30

31 / 50

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

decrease

remain unaffected

may increase or decrease depending on the type of refrigerant used

increase

32 / 50

Micro motion study is__________________?

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

study of man and machine conducted simultaneously

motion study* observed on enhanced time intervals

33 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

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

temperature

speed

34 / 50

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

flat saddle key

feather key

gib head key

wood-ruff key

35 / 50

Capillary action is due to the_________________?

all of the above

surface tension

cohesion of the liquid

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

36 / 50

Combustion in compression ignition engines is____________________?

laminar

homogeneous

None

heterogeneous

37 / 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

38 / 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

39 / 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

40 / 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-8

6f-4

3t2-lt

3t2+2t

41 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

expansion valve

condenser

compressor

42 / 50

An example of amorphous material is____________?

lead

silver

zinc

glass

43 / 50

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

less power requirement

lower volumetric efficiency

less loss of air due to leakage past the cylinder

better mechanical balance

44 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different specific heat

different heat contents

different atomic structure

45 / 50

The knock in diesel engine occurs due to____________________?

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

reduction of delay period

instantaneous atuo iginition of last part of charge

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

supersonics, as with projectiles and jet propulsion

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

all of fhe above

47 / 50

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

force of friction

force of cohesion

force of adhesion

force of diffusion

48 / 50

String diagram is used when__________________?

team of workers is working at a place

material handling is to be done

all of the above

idle time is to be reduced

49 / 50

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

p = T/2r

p = T/r

p = 2T/r

p = Txr

50 / 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

8 tonnes/cm2

16 tonnes/cm2

22 tonnes/cm2

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