Mechanical Engineering Quiz 8

1 / 50

Antifriction bearings are__________________?

none of the above

hydrodynamic bearings

thin lubricated bearings

sleeve bearings

2 / 50

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

better mechanical balance

less power requirement

less loss of air due to leakage past the cylinder

lower volumetric efficiency

3 / 50

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

yes

data are insufficient to determine it

it is a marginal case

4 / 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

5 / 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 diffusion

force of cohesion

force of adhesion

6 / 50

A nuclear unit becoming critical means_______________?

it is capable of generating much more than rated capacity

there is danger of nuclear spread

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

it is generating power to rated capacity

7 / 50

Which is more viscous lub oil_________________?

SAE 80

SAE 50

SAE 4?

SEA 30

8 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

compressor

expansion valve

condenser

9 / 50

Micro motion study is__________________?

motion study of a sequence of operations conducted systematically

study of man and machine conducted simultaneously

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

10 / 50

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

p = 2T/r

p = T/r

p = T/2r

p = Txr

11 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

average pressure

minimum pressure

maximum pressure developed

instantaneous pressure at any instant

12 / 50

Critical Path Net Work helps an engineer_________________?

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

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

all of the above

13 / 50

Combustion in compression ignition engines is____________________?

None

heterogeneous

laminar

homogeneous

14 / 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

4 tonnes/cm2

8 tonnes/cm2

16 tonnes/cm2

15 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.10%

0.40%

0.60%

16 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

17 / 50

Detonation is caused by the following unstable compounds______________________?

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

18 / 50

Work study is concerned with_________________?

motivation of workers

improving present method and finding standard time

improving production capability

improving production planning and control

19 / 50

Steel made from phosphatic iron is_________________?

ductile

brittle

hard

tough

20 / 50

Density of water is maximum at__________________?

4?C

100?C

0?C

0?K

21 / 50

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

specific viscosity

coefficient of viscosity

viscosity index

kinematic viscosity

22 / 50

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

breaking point of the material

plastic point of the material

elastic point of the material

yielding point of the material

23 / 50

Work done is zero for the following process_________________?

free expansion

throttling

all Of the above

constant volume

24 / 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

25 / 50

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

gib head key

wood-ruff key

flat saddle key

feather key

26 / 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-4

3t2-lt

3t2+2t

6f-8

27 / 50

The draw of cotter need not exceed_________________?

3 mm

20 mm

10 mm

5 mm

28 / 50

An example of amorphous material is____________?

zinc

lead

silver

glass

29 / 50

String diagram is used when__________________?

material handling is to be done

team of workers is working at a place

idle time is to be reduced

all of the above

30 / 50

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

suction port and transfer port

transfer port only

suction port and exhaust port

suction port, exhaust port and transfer port

31 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

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

speed

temperature

32 / 50

A large Roynold number is indication of________________?

laminar flow

smooth and streamline flow

highly turbulent flow

steady flow

33 / 50

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

increase

decrease

may increase or decrease depending on the type of refrigerant used

remain unaffected

34 / 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________________?

static loading

combined static and dynamic loading

dynamic loading

completely reversed loading

35 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of manpower

the flow of material in the plant

the methods of proper utilization of machines

the layout of factory facilities

36 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different atomic structure

different specific heat

different heat contents

37 / 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

p/ZN

Z/pN

38 / 50

Time study is__________________?

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

method of fixing time for workers

39 / 50

A boiling water reactor uses following as fuel________________?

thorium

enriched uranium

plutonium

40 / 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

annuity charging method

straight line method

A-B-C charging method

41 / 50

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

400 m3/kg mol

41.7 m3/kg mol

0.15 m3/kg mol

4.17m3/kgmol

42 / 50

Capillary action is due to the_________________?

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

cohesion of the liquid

all of the above

surface tension

43 / 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%

44 / 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

reduction of delay period

instantaneous and rapid burning of the first part of the charge

45 / 50

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

2j-l

j-2

2/-3

3/-2

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

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

Freon

Brine

48 / 50

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

speed

Vspeed

altitude

speed

49 / 50

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

right angled triangle

equilateral triangle

circle

square

50 / 50

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

cooling the oil in the settling tanks

burning the oil

heating the oil in the settling tanks

suspension

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