Mechanical Engineering Quiz 8

1 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of manpower

the layout of factory facilities

the flow of material in the plant

the methods of proper utilization of machines

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___________________?

22 tonnes/cm2

8 tonnes/cm2

16 tonnes/cm2

4 tonnes/cm2

3 / 50

Antifriction bearings are__________________?

hydrodynamic bearings

thin lubricated bearings

sleeve bearings

none of the above

4 / 50

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

p = Txr

p = 2T/r

p = T/2r

p = T/r

5 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

6 / 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

7 / 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

Brine

Ammonia

Carbon dioxide

8 / 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

9 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

average pressure

minimum pressure

instantaneous pressure at any instant

maximum pressure developed

10 / 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

straight line method

sinking fund method

11 / 50

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

speed

altitude

Vspeed

12 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

compressor

condenser

expansion valve

13 / 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

14 / 50

A nuclear unit becoming critical means_______________?

it is generating power to rated capacity

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

15 / 50

Work done is zero for the following process_________________?

all Of the above

constant volume

free expansion

throttling

16 / 50

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

burning the oil

suspension

heating the oil in the settling tanks

cooling the oil in the settling tanks

17 / 50

According to Avogadro?s Hypothesis ______________________?

gases have two values of specific heat

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

18 / 50

Mach number is significant in_____________________?

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

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

19 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.10%

0.40%

0.60%

20 / 50

String diagram is used when__________________?

material handling is to be done

idle time is to be reduced

team of workers is working at a place

all of the above

21 / 50

The main advantage of line organisation is its_______________?

all of the above

effective command and control

rigid discipline in the organisation

defined responsibilities at all levels

22 / 50

An example of amorphous material is____________?

glass

silver

lead

zinc

23 / 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

plastic point of the material

breaking point of the material

24 / 50

Critical Path Net Work helps an engineer_________________?

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

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

25 / 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

all of the above

surface tension

26 / 50

The draw of cotter need not exceed_________________?

10 mm

5 mm

3 mm

20 mm

27 / 50

The knock in diesel engine occurs due to____________________?

reduction of delay period

instantaneous atuo iginition of last part of charge

instantaneous and rapid burning of the first part of the charge

delayed burning of the first part of the charge

28 / 50

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

data are insufficient to determine it

yes

it is a marginal case

29 / 50

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

2j-l

2/-3

3/-2

j-2

30 / 50

Micro motion study is__________________?

motion study* observed on enhanced time intervals

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 of a sequence of operations conducted systematically

31 / 50

Detonation is caused by the following unstable compounds______________________?

ketones and sulphur compounds

peroxides, aldehydes and ketones

peroxides, aldehydes, oxides and sul-phides

aldehydes, oxides and ketones

32 / 50

Steel made from phosphatic iron is_________________?

ductile

tough

hard

brittle

33 / 50

Work study is concerned with_________________?

improving present method and finding standard time

improving production capability

improving production planning and control

motivation of workers

34 / 50

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

coefficient of viscosity

specific viscosity

viscosity index

kinematic viscosity

35 / 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________________?

dynamic loading

static loading

combined static and dynamic loading

completely reversed loading

36 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant volume

Higher calorific value at constant pressure

Lower calorific value at constant pressure

Lower calorific value at constant volume ,

37 / 50

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

circle

right angled triangle

square

equilateral triangle

38 / 50

Time study is__________________?

method of fixing time for workers

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

time taken by workers to do a job

machine setting time

39 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different specific heat

different heat contents

different atomic structure

40 / 50

A large Roynold number is indication of________________?

steady flow

highly turbulent flow

laminar flow

smooth and streamline flow

41 / 50

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

transfer port only

suction port and transfer port

suction port, exhaust port and transfer port

suction port and exhaust port

42 / 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________________?

ZN/p

p/ZN

Z/pN

N/Zp

43 / 50

Density of water is maximum at__________________?

100?C

4?C

0?C

0?K

44 / 50

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

0.15 m3/kg mol

400 m3/kg mol

41.7 m3/kg mol

4.17m3/kgmol

45 / 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

46 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

temperature

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

speed

47 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

plutonium

thorium

48 / 50

Combustion in compression ignition engines is____________________?

homogeneous

None

heterogeneous

laminar

49 / 50

Which is more viscous lub oil_________________?

SAE 4?

SEA 30

SAE 80

SAE 50

50 / 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 diffusion

force of cohesion

force of friction

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