Mechanical Engineering Quiz 8

1 / 50

An example of amorphous material is____________?

glass

zinc

silver

lead

2 / 50

Steel made from phosphatic iron is_________________?

tough

ductile

hard

brittle

3 / 50

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

viscosity index

coefficient of viscosity

kinematic viscosity

specific viscosity

4 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

speed

temperature

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

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

22 tonnes/cm2

16 tonnes/cm2

4 tonnes/cm2

6 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

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

motion study of a sequence of operations conducted systematically

7 / 50

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

lower volumetric efficiency

less power requirement

better mechanical balance

less loss of air due to leakage past the cylinder

8 / 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

Ammonia

Brine

9 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 4?

SAE 50

SAE 80

10 / 50

Mach number is significant in_____________________?

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

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

11 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.40%

0.10%

0.60%

12 / 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

breaking point of the material

plastic point of the material

yielding point of the material

13 / 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%

14 / 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________________?

combined static and dynamic loading

static loading

completely reversed loading

dynamic loading

15 / 50

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

burning the oil

heating the oil in the settling tanks

cooling the oil in the settling tanks

suspension

16 / 50

Antifriction bearings are__________________?

thin lubricated bearings

sleeve bearings

none of the above

hydrodynamic bearings

17 / 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

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

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

18 / 50

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

0.15 m3/kg mol

4.17m3/kgmol

400 m3/kg mol

41.7 m3/kg mol

19 / 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 adhesion

force of diffusion

force of cohesion

20 / 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

annuity charging method

A-B-C charging method

21 / 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

22 / 50

String diagram is used when__________________?

all of the above

material handling is to be done

idle time is to be reduced

team of workers is working at a place

23 / 50

Work study is concerned with_________________?

improving production planning and control

improving present method and finding standard time

improving production capability

motivation of workers

24 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

average pressure

minimum pressure

maximum pressure developed

instantaneous pressure at any instant

25 / 50

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

circle

square

equilateral triangle

right angled triangle

26 / 50

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

j-2

2/-3

2j-l

3/-2

27 / 50

The knock in diesel engine occurs due to____________________?

reduction of delay period

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

instantaneous atuo iginition of last part of charge

28 / 50

Density of water is maximum at__________________?

4?C

0?C

0?K

100?C

29 / 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

N/Zp

p/ZN

30 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

plutonium

thorium

31 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different specific heat

different heat contents

different atomic structure

32 / 50

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

speed

Vspeed

speed

altitude

33 / 50

Routing assists engineers in deciding in advance___________________?

the flow of material in the plant

the layout of factory facilities

the methods of proper utilization of machines

the methods of proper utilization of manpower

34 / 50

Work done is zero for the following process_________________?

throttling

free expansion

constant volume

all Of the above

35 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant volume

Lower calorific value at constant volume ,

Lower calorific value at constant pressure

Higher calorific value at constant pressure

36 / 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

37 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

condenser

evaparator

expansion valve

38 / 50

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

p = Txr

p = 2T/r

p = T/r

p = T/2r

39 / 50

Capillary action is due to the_________________?

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

surface tension

cohesion of the liquid

all of the above

40 / 50

A large Roynold number is indication of________________?

laminar flow

highly turbulent flow

steady flow

smooth and streamline flow

41 / 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

3t2-lt

6f-4

3t2+2t

42 / 50

A nuclear unit becoming critical means_______________?

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

it is generating power to rated capacity

it is capable of generating much more than rated capacity

there is danger of nuclear spread

43 / 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

44 / 50

Time study is__________________?

method of fixing time for workers

time taken by workers to do a job

machine setting time

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

45 / 50

Combustion in compression ignition engines is____________________?

None

heterogeneous

laminar

homogeneous

46 / 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

47 / 50

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

flat saddle key

gib head key

feather key

wood-ruff key

48 / 50

Detonation is caused by the following unstable compounds______________________?

ketones and sulphur compounds

aldehydes, oxides and ketones

peroxides, aldehydes and ketones

peroxides, aldehydes, oxides and sul-phides

49 / 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

all of the above

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

to concentrate his attention on critical activities

50 / 50

The draw of cotter need not exceed_________________?

20 mm

3 mm

10 mm

5 mm

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