Mechanical Engineering Quiz 8

1 / 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 concentrate his attention on critical activities

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

2 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

condenser

expansion valve

evaparator

3 / 50

Density of water is maximum at__________________?

100?C

0?C

0?K

4?C

4 / 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________________?

combined static and dynamic loading

static loading

dynamic loading

completely reversed loading

5 / 50

Antifriction bearings are__________________?

none of the above

sleeve bearings

hydrodynamic bearings

thin lubricated bearings

6 / 50

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

cooling the oil in the settling tanks

heating the oil in the settling tanks

burning the oil

suspension

7 / 50

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

remain unaffected

decrease

may increase or decrease depending on the type of refrigerant used

increase

8 / 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

9 / 50

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

specific viscosity

coefficient of viscosity

kinematic viscosity

viscosity index

10 / 50

An example of amorphous material is____________?

zinc

silver

glass

lead

11 / 50

A nuclear unit becoming critical means_______________?

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

it is capable of generating much more than rated capacity

it is generating power to rated capacity

there is danger of nuclear spread

12 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant volume ,

Higher calorific value at constant volume

Higher calorific value at constant pressure

Lower calorific value at constant pressure

13 / 50

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

suction port, exhaust port and transfer port

suction port and exhaust port

transfer port only

suction port and transfer port

14 / 50

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

p = T/r

p = T/2r

p = Txr

p = 2T/r

15 / 50

An engine indicator is used to determine the following___________________?

temperature

volume of cylinder

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

speed

16 / 50

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_________________?

force of diffusion

force of cohesion

force of friction

force of adhesion

17 / 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

plastic point of the material

yielding point of the material

18 / 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

square

circle

19 / 50

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

wood-ruff key

feather key

gib head key

flat saddle key

20 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

peroxides, aldehydes, oxides and sul-phides

ketones and sulphur compounds

21 / 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

22 / 50

Drop forging dies contain carbon of the order of_________________?

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

0.6 to 0.7%

23 / 50

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

2/-3

j-2

2j-l

3/-2

24 / 50

Work done is zero for the following process_________________?

free expansion

constant volume

throttling

all Of the above

25 / 50

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

Vspeed

speed

altitude

speed

26 / 50

A boiling water reactor uses following as fuel________________?

plutonium

enriched uranium

thorium

27 / 50

The knock in diesel engine occurs due to____________________?

instantaneous and rapid burning of the first part of the charge

reduction of delay period

instantaneous atuo iginition of last part of charge

delayed burning of the first part of the charge

28 / 50

Steel made from phosphatic iron is_________________?

ductile

brittle

tough

hard

29 / 50

The main advantage of line organisation is its_______________?

defined responsibilities at all levels

rigid discipline in the organisation

all of the above

effective command and control

30 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

gases have two values of specific heat

31 / 50

Time study is__________________?

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

machine setting time

method of fixing time for workers

time taken by workers to do a job

32 / 50

A large Roynold number is indication of________________?

highly turbulent flow

smooth and streamline flow

steady flow

laminar flow

33 / 50

The draw of cotter need not exceed_________________?

3 mm

20 mm

10 mm

5 mm

34 / 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

8 tonnes/cm2

22 tonnes/cm2

16 tonnes/cm2

35 / 50

Mach number is significant in_____________________?

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.

supersonics, as with projectiles and jet propulsion

36 / 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

Z/pN

p/ZN

N/Zp

37 / 50

Combustion in compression ignition engines is____________________?

laminar

homogeneous

heterogeneous

None

38 / 50

Work study is concerned with_________________?

improving present method and finding standard time

motivation of workers

improving production planning and control

improving production capability

39 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 50

SAE 80

SAE 4?

40 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

average pressure

minimum pressure

instantaneous pressure at any instant

41 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.60%

0.20%

0.40%

0.10%

42 / 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

43 / 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

study of man and machine conducted simultaneously

motion study of a sequence of operations conducted systematically

motion study* observed on enhanced time intervals

44 / 50

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

less power requirement

better mechanical balance

lower volumetric efficiency

less loss of air due to leakage past the cylinder

45 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different temperatures

different atomic structure

different heat contents

46 / 50

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

41.7 m3/kg mol

4.17m3/kgmol

0.15 m3/kg mol

400 m3/kg mol

47 / 50

Capillary action is due to the_________________?

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

all of the above

surface tension

cohesion of the liquid

48 / 50

Routing assists engineers in deciding in advance___________________?

the flow of material in the plant

the methods of proper utilization of machines

the layout of factory facilities

the methods of proper utilization of manpower

49 / 50

String diagram is used when__________________?

idle time is to be reduced

all of the above

team of workers is working at a place

material handling is to be done

50 / 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

straight line method

A-B-C charging method

sinking fund method

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