Mechanical Engineering Quiz 8

1 / 50

A nuclear unit becoming critical means_______________?

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

it is capable of generating much more than rated capacity

2 / 50

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

0.15 m3/kg mol

41.7 m3/kg mol

400 m3/kg mol

4.17m3/kgmol

3 / 50

String diagram is used when__________________?

all of the above

material handling is to be done

idle time is to be reduced

team of workers is working at a place

4 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

plutonium

thorium

5 / 50

The draw of cotter need not exceed_________________?

5 mm

3 mm

20 mm

10 mm

6 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

motion study* observed on enhanced time intervals

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

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 __________________?

6f-8

3t2-lt

6f-4

3t2+2t

8 / 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

8 tonnes/cm2

22 tonnes/cm2

4 tonnes/cm2

9 / 50

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

suction port and exhaust port

transfer port only

suction port, exhaust port and transfer port

suction port and transfer port

10 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of manpower

the methods of proper utilization of machines

the flow of material in the plant

the layout of factory facilities

11 / 50

Work done is zero for the following process_________________?

throttling

free expansion

all Of the above

constant volume

12 / 50

Capillary action is due to the_________________?

all of the above

cohesion of the liquid

surface tension

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

13 / 50

Steel made from phosphatic iron is_________________?

hard

tough

ductile

brittle

14 / 50

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

flat saddle key

gib head key

feather key

wood-ruff key

15 / 50

An example of amorphous material is____________?

zinc

silver

glass

lead

16 / 50

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

Vspeed

speed

altitude

speed

17 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant pressure

Higher calorific value at constant volume

Higher calorific value at constant pressure

Lower calorific value at constant volume ,

18 / 50

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

may increase or decrease depending on the type of refrigerant used

decrease

remain unaffected

increase

19 / 50

Presence of moisture in a refrigerant affects the working of___________________?

condenser

compressor

expansion valve

evaparator

20 / 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 friction

force of diffusion

21 / 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

completely reversed loading

combined static and dynamic loading

static loading

22 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes, oxides and sul-phides

aldehydes, oxides and ketones

ketones and sulphur compounds

peroxides, aldehydes and ketones

23 / 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

annuity charging method

straight line method

24 / 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

25 / 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

plastic point of the material

yielding point of the material

breaking point of the material

26 / 50

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

heating the oil in the settling tanks

burning the oil

cooling the oil in the settling tanks

suspension

27 / 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

28 / 50

Antifriction bearings are__________________?

thin lubricated bearings

none of the above

hydrodynamic bearings

sleeve bearings

29 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different temperatures

different heat contents

different atomic structure

30 / 50

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

j-2

2/-3

3/-2

2j-l

31 / 50

Density of water is maximum at__________________?

4?C

0?K

100?C

0?C

32 / 50

Which is more viscous lub oil_________________?

SAE 50

SEA 30

SAE 80

SAE 4?

33 / 50

Critical Path Net Work helps an engineer_________________?

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

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

34 / 50

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

p = T/2r

p = T/r

p = 2T/r

p = Txr

35 / 50

A large Roynold number is indication of________________?

highly turbulent flow

smooth and streamline flow

laminar flow

steady flow

36 / 50

Combustion in compression ignition engines is____________________?

None

laminar

heterogeneous

homogeneous

37 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.60%

0.40%

0.20%

38 / 50

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

coefficient of viscosity

kinematic viscosity

viscosity index

specific viscosity

39 / 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

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

40 / 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

41 / 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

p/ZN

N/Zp

ZN/p

42 / 50

The main advantage of line organisation is its_______________?

defined responsibilities at all levels

all of the above

rigid discipline in the organisation

effective command and control

43 / 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________________?

Brine

Freon

Ammonia

Carbon dioxide

44 / 50

Time study is__________________?

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

time taken by workers to do a job

method of fixing time for workers

machine setting time

45 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

instantaneous pressure at any instant

average pressure

minimum pressure

46 / 50

Work study is concerned with_________________?

improving present method and finding standard time

improving production planning and control

motivation of workers

improving production capability

47 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

reduction of delay period

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

48 / 50

An engine indicator is used to determine the following___________________?

speed

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

temperature

volume of cylinder

49 / 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

less power requirement

lower volumetric efficiency

better mechanical balance

50 / 50

Drop forging dies contain carbon of the order of_________________?

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

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