Mechanical Engineering Quiz 8

1 / 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

2 / 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

4 tonnes/cm2

22 tonnes/cm2

16 tonnes/cm2

3 / 50

Heat flows from one body to other when they have_________________?

different heat contents

different specific heat

different temperatures

different atomic structure

4 / 50

Steel made from phosphatic iron is_________________?

hard

brittle

tough

ductile

5 / 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

increase

remain unaffected

6 / 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

7 / 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-8

6f-4

3t2+2t

8 / 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

dynamic loading

completely reversed loading

9 / 50

Work done is zero for the following process_________________?

constant volume

free expansion

throttling

all Of the above

10 / 50

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

suction port and exhaust port

suction port and transfer port

transfer port only

suction port, exhaust port and transfer port

11 / 50

An engine indicator is used to determine the following___________________?

temperature

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

speed

volume of cylinder

12 / 50

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

less loss of air due to leakage past the cylinder

better mechanical balance

less power requirement

lower volumetric efficiency

13 / 50

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

41.7 m3/kg mol

0.15 m3/kg mol

400 m3/kg mol

4.17m3/kgmol

14 / 50

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

2/-3

j-2

3/-2

2j-l

15 / 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_____________________?

sinking fund method

A-B-C charging method

straight line method

annuity charging method

16 / 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

Z/pN

ZN/p

N/Zp

17 / 50

Combustion in compression ignition engines is____________________?

homogeneous

laminar

None

heterogeneous

18 / 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________________?

Ammonia

Brine

Freon

Carbon dioxide

19 / 50

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

force of adhesion

force of cohesion

force of diffusion

force of friction

20 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

expansion valve

compressor

condenser

21 / 50

Time study is__________________?

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

machine setting time

method of fixing time for workers

time taken by workers to do a job

22 / 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 concentrate his attention on critical activities

all of the above

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

23 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

minimum pressure

instantaneous pressure at any instant

average pressure

24 / 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

25 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.20%

0.40%

0.60%

26 / 50

The knock in diesel engine occurs due to____________________?

delayed burning of the first part of the charge

reduction of delay period

instantaneous atuo iginition of last part of charge

instantaneous and rapid burning of the first part of the charge

27 / 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

cohesion of the liquid

surface tension

28 / 50

Antifriction bearings are__________________?

none of the above

hydrodynamic bearings

sleeve bearings

thin lubricated bearings

29 / 50

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

burning the oil

suspension

cooling the oil in the settling tanks

heating the oil in the settling tanks

30 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

31 / 50

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

p = T/r

p = T/2r

p = Txr

p = 2T/r

32 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 50

SAE 4?

SAE 80

33 / 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

34 / 50

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

altitude

Vspeed

speed

35 / 50

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

feather key

flat saddle key

gib head key

wood-ruff key

36 / 50

An example of amorphous material is____________?

silver

lead

zinc

glass

37 / 50

The main advantage of line organisation is its_______________?

all of the above

rigid discipline in the organisation

effective command and control

defined responsibilities at all levels

38 / 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* observed on enhanced time intervals

motion study of a sequence of operations conducted systematically

study of man and machine conducted simultaneously

39 / 50

Drop forging dies contain carbon of the order of_________________?

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

40 / 50

Work study is concerned with_________________?

improving production capability

motivation of workers

improving production planning and control

improving present method and finding standard time

41 / 50

String diagram is used when__________________?

team of workers is working at a place

idle time is to be reduced

all of the above

material handling is to be done

42 / 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

43 / 50

Density of water is maximum at__________________?

0?C

4?C

0?K

100?C

44 / 50

A large Roynold number is indication of________________?

laminar flow

steady flow

highly turbulent flow

smooth and streamline flow

45 / 50

A boiling water reactor uses following as fuel________________?

thorium

enriched uranium

plutonium

46 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant pressure

Higher calorific value at constant pressure

Lower calorific value at constant volume ,

Higher calorific value at constant volume

47 / 50

The draw of cotter need not exceed_________________?

5 mm

20 mm

10 mm

3 mm

48 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones

ketones and sulphur compounds

aldehydes, oxides and ketones

peroxides, aldehydes, oxides and sul-phides

49 / 50

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

coefficient of viscosity

viscosity index

kinematic viscosity

specific viscosity

50 / 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

there is danger of nuclear spread

it is capable of generating much more than rated capacity

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