Mechanical Engineering Quiz 8

1 / 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

2 / 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

better mechanical balance

lower volumetric efficiency

3 / 50

Steel made from phosphatic iron is_________________?

hard

tough

ductile

brittle

4 / 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

5 / 50

Presence of moisture in a refrigerant affects the working of___________________?

condenser

expansion valve

evaparator

compressor

6 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.40%

0.60%

0.10%

0.20%

7 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

temperature

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

speed

8 / 50

The knock in diesel engine occurs due to____________________?

delayed burning of the first part of the charge

reduction of delay period

instantaneous atuo iginition of last part of charge

instantaneous and rapid burning of the first part of the charge

9 / 50

Drop forging dies contain carbon of the order of_________________?

0.6 to 0.7%

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

10 / 50

A large Roynold number is indication of________________?

laminar flow

highly turbulent flow

steady flow

smooth and streamline flow

11 / 50

Heat flows from one body to other when they have_________________?

different heat contents

different atomic structure

different specific heat

different temperatures

12 / 50

Combustion in compression ignition engines is____________________?

laminar

heterogeneous

None

homogeneous

13 / 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

14 / 50

Which is more viscous lub oil_________________?

SAE 4?

SAE 80

SAE 50

SEA 30

15 / 50

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

kinematic viscosity

viscosity index

specific viscosity

coefficient of viscosity

16 / 50

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

suction port and transfer port

suction port, exhaust port and transfer port

transfer port only

suction port and exhaust port

17 / 50

Antifriction bearings are__________________?

thin lubricated bearings

hydrodynamic bearings

sleeve bearings

none of the above

18 / 50

Mach number is significant in_____________________?

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

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship?s hulls

all of fhe above

supersonics, as with projectiles and jet propulsion

19 / 50

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

increase

may increase or decrease depending on the type of refrigerant used

decrease

remain unaffected

20 / 50

Critical Path Net Work helps an engineer_________________?

to concentrate his attention on critical activities

all of the above

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

21 / 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

22 / 50

The draw of cotter need not exceed_________________?

10 mm

5 mm

20 mm

3 mm

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

annuity charging method

straight line method

A-B-C charging method

24 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant pressure

Lower calorific value at constant pressure

Lower calorific value at constant volume ,

Higher calorific value at constant volume

25 / 50

Work done is zero for the following process_________________?

free expansion

throttling

all Of the above

constant volume

26 / 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

completely reversed loading

dynamic loading

27 / 50

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

p = T/2r

p = 2T/r

p = T/r

p = Txr

28 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the flow of material in the plant

the methods of proper utilization of machines

the methods of proper utilization of manpower

29 / 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

6f-8

3t2+2t

3t2-lt

30 / 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

31 / 50

The main advantage of line organisation is its_______________?

effective command and control

all of the above

rigid discipline in the organisation

defined responsibilities at all levels

32 / 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

33 / 50

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

right angled triangle

circle

square

equilateral triangle

34 / 50

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

j-2

2/-3

2j-l

3/-2

35 / 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

36 / 50

According to Avogadro?s Hypothesis ______________________?

gases have two values of specific heat

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

product of the gas constant and the molecular weight of an ideal gas is constant

37 / 50

Time study is__________________?

machine setting time

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

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

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

Freon

Ammonia

Brine

40 / 50

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

Vspeed

speed

altitude

41 / 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___________________?

8 tonnes/cm2

4 tonnes/cm2

22 tonnes/cm2

16 tonnes/cm2

42 / 50

Density of water is maximum at__________________?

0?K

100?C

4?C

0?C

43 / 50

Micro motion study is__________________?

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

study of man and machine conducted simultaneously

44 / 50

An example of amorphous material is____________?

glass

lead

silver

zinc

45 / 50

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

41.7 m3/kg mol

400 m3/kg mol

4.17m3/kgmol

0.15 m3/kg mol

46 / 50

The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________?

plastic point of the material

elastic point of the material

breaking point of the material

yielding point of the material

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

The mean effective pressure obtained from engine indicator indicates the________________?

average pressure

instantaneous pressure at any instant

maximum pressure developed

minimum pressure

49 / 50

A boiling water reactor uses following as fuel________________?

plutonium

enriched uranium

thorium

50 / 50

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

gib head key

wood-ruff key

feather key

flat saddle key

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