Mechanical Engineering Quiz 8

1 / 50

Which is more viscous lub oil_________________?

SAE 50

SAE 80

SAE 4?

SEA 30

2 / 50

Antifriction bearings are__________________?

sleeve bearings

thin lubricated bearings

none of the above

hydrodynamic bearings

3 / 50

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

less power requirement

lower volumetric efficiency

better mechanical balance

less loss of air due to leakage past the cylinder

4 / 50

Time study is__________________?

machine setting time

method of fixing time for workers

time taken by workers to do a job

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

5 / 50

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

2/-3

2j-l

j-2

3/-2

6 / 50

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

p = T/r

p = 2T/r

p = T/2r

p = Txr

7 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant pressure

Lower calorific value at constant volume ,

Higher calorific value at constant volume

Higher calorific value at constant pressure

8 / 50

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

heating the oil in the settling tanks

suspension

cooling the oil in the settling tanks

burning the oil

9 / 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 diffusion

force of friction

force of adhesion

10 / 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

22 tonnes/cm2

8 tonnes/cm2

16 tonnes/cm2

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

to concentrate his attention on critical activities

12 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.7 to 0.9%

0.1 to 0.2%

0.6 to 0.7%

13 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

motion study* observed on enhanced time intervals

motion study of a sequence of operations conducted systematically

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

14 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

minimum pressure

average pressure

instantaneous pressure at any instant

maximum pressure developed

15 / 50

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

speed

altitude

Vspeed

speed

16 / 50

A large Roynold number is indication of________________?

steady flow

smooth and streamline flow

laminar flow

highly turbulent flow

17 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

instantaneous and rapid burning of the first part of the charge

reduction of delay period

delayed burning of the first part of the charge

18 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different atomic structure

different heat contents

different temperatures

19 / 50

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

circle

equilateral triangle

right angled triangle

square

20 / 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

21 / 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

22 / 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

A-B-C charging method

sinking fund method

straight line method

23 / 50

Work study is concerned with_________________?

improving production planning and control

motivation of workers

improving production capability

improving present method and finding standard time

24 / 50

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

gib head key

flat saddle key

feather key

wood-ruff key

25 / 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

p/ZN

N/Zp

26 / 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

27 / 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

28 / 50

An example of amorphous material is____________?

silver

lead

glass

zinc

29 / 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

elastic point of the material

yielding point of the material

plastic point of the material

30 / 50

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

specific viscosity

viscosity index

coefficient of viscosity

kinematic viscosity

31 / 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

32 / 50

Routing assists engineers in deciding in advance___________________?

the flow of material in the plant

the methods of proper utilization of manpower

the layout of factory facilities

the methods of proper utilization of machines

33 / 50

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

it is a marginal case

data are insufficient to determine it

yes

34 / 50

The main advantage of line organisation is its_______________?

effective command and control

defined responsibilities at all levels

rigid discipline in the organisation

all of the above

35 / 50

Combustion in compression ignition engines is____________________?

laminar

None

heterogeneous

homogeneous

36 / 50

Steel made from phosphatic iron is_________________?

ductile

brittle

hard

tough

37 / 50

Mach number is significant in_____________________?

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

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

supersonics, as with projectiles and jet propulsion

38 / 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

39 / 50

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

400 m3/kg mol

0.15 m3/kg mol

41.7 m3/kg mol

4.17m3/kgmol

40 / 50

Density of water is maximum at__________________?

0?C

100?C

0?K

4?C

41 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.40%

0.10%

0.60%

42 / 50

A boiling water reactor uses following as fuel________________?

thorium

plutonium

enriched uranium

43 / 50

An engine indicator is used to determine the following___________________?

speed

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

volume of cylinder

temperature

44 / 50

The draw of cotter need not exceed_________________?

3 mm

20 mm

10 mm

5 mm

45 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

condenser

expansion valve

compressor

46 / 50

Work done is zero for the following process_________________?

all Of the above

constant volume

throttling

free expansion

47 / 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

48 / 50

Detonation is caused by the following unstable compounds______________________?

ketones and sulphur compounds

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

peroxides, aldehydes, oxides and sul-phides

49 / 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

50 / 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________________?

Freon

Carbon dioxide

Brine

Ammonia

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