Mechanical Engineering Quiz 8

1 / 50

String diagram is used when__________________?

idle time is to be reduced

material handling is to be done

all of the above

team of workers is working at a place

2 / 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

3 / 50

Work study is concerned with_________________?

motivation of workers

improving present method and finding standard time

improving production capability

improving production planning and control

4 / 50

Antifriction bearings are__________________?

none of the above

thin lubricated bearings

sleeve bearings

hydrodynamic bearings

5 / 50

Combustion in compression ignition engines is____________________?

laminar

None

homogeneous

heterogeneous

6 / 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

7 / 50

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

speed

Vspeed

altitude

8 / 50

Which is more viscous lub oil_________________?

SAE 50

SAE 4?

SEA 30

SAE 80

9 / 50

Density of water is maximum at__________________?

0?C

0?K

100?C

4?C

10 / 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 adhesion

force of diffusion

force of friction

11 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different atomic structure

different heat contents

different temperatures

12 / 50

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

feather key

wood-ruff key

gib head key

flat saddle key

13 / 50

The knock in diesel engine occurs due to____________________?

instantaneous and rapid burning of the first part of the charge

delayed burning of the first part of the charge

instantaneous atuo iginition of last part of charge

reduction of delay period

14 / 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_____________________?

A-B-C charging method

annuity charging method

sinking fund method

straight line method

15 / 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

Brine

Freon

16 / 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+2t

3t2-lt

6f-4

6f-8

17 / 50

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

j-2

2j-l

2/-3

3/-2

18 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.60%

0.40%

0.10%

0.20%

19 / 50

A boiling water reactor uses following as fuel________________?

thorium

plutonium

enriched uranium

20 / 50

Presence of moisture in a refrigerant affects the working of___________________?

condenser

compressor

expansion valve

evaparator

21 / 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

p/ZN

Z/pN

ZN/p

22 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

instantaneous pressure at any instant

average pressure

maximum pressure developed

minimum pressure

23 / 50

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

specific viscosity

viscosity index

coefficient of viscosity

kinematic viscosity

24 / 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

25 / 50

An engine indicator is used to determine the following___________________?

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

speed

temperature

volume of cylinder

26 / 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

27 / 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___________________?

16 tonnes/cm2

4 tonnes/cm2

22 tonnes/cm2

8 tonnes/cm2

28 / 50

The main advantage of line organisation is its_______________?

rigid discipline in the organisation

effective command and control

defined responsibilities at all levels

all of the above

29 / 50

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

square

right angled triangle

circle

equilateral triangle

30 / 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%

31 / 50

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

p = 2T/r

p = Txr

p = T/2r

p = T/r

32 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes, oxides and sul-phides

ketones and sulphur compounds

aldehydes, oxides and ketones

peroxides, aldehydes and ketones

33 / 50

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

cooling the oil in the settling tanks

suspension

burning the oil

heating the oil in the settling tanks

34 / 50

A nuclear unit becoming critical means_______________?

it is capable of generating much more than rated capacity

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

there is danger of nuclear spread

it is generating power to rated capacity

35 / 50

An example of amorphous material is____________?

silver

glass

zinc

lead

36 / 50

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

suction port, exhaust port and transfer port

suction port and transfer port

suction port and exhaust port

transfer port only

37 / 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

motion study* observed on enhanced time intervals

study of man and machine conducted simultaneously

38 / 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

4.17m3/kgmol

41.7 m3/kg mol

39 / 50

A large Roynold number is indication of________________?

highly turbulent flow

steady flow

laminar flow

smooth and streamline flow

40 / 50

According to Avogadro?s Hypothesis ______________________?

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

gases have two values of specific heat

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

41 / 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

42 / 50

The draw of cotter need not exceed_________________?

20 mm

3 mm

5 mm

10 mm

43 / 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

yielding point of the material

breaking point of the material

plastic point of the material

44 / 50

Time study is__________________?

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

method of fixing time for workers

time taken by workers to do a job

machine setting time

45 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant pressure

Higher calorific value at constant volume

Lower calorific value at constant volume ,

Lower calorific value at constant pressure

46 / 50

Work done is zero for the following process_________________?

throttling

free expansion

constant volume

all Of the above

47 / 50

Steel made from phosphatic iron is_________________?

tough

ductile

hard

brittle

48 / 50

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

decrease

increase

remain unaffected

may increase or decrease depending on the type of refrigerant used

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

completely reversed loading

combined static and dynamic loading

dynamic loading

50 / 50

Capillary action is due to the_________________?

cohesion of the liquid

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

surface tension

all of the above

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