Mechanical Engineering Quiz 8

1 / 50

A boiling water reactor uses following as fuel________________?

thorium

plutonium

enriched uranium

2 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.40%

0.60%

0.10%

0.20%

3 / 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 manpower

the methods of proper utilization of machines

4 / 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

4 tonnes/cm2

16 tonnes/cm2

5 / 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

ZN/p

Z/pN

p/ZN

6 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

instantaneous pressure at any instant

average pressure

minimum pressure

maximum pressure developed

7 / 50

An engine indicator is used to determine the following___________________?

speed

volume of cylinder

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

temperature

8 / 50

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

decrease

increase

may increase or decrease depending on the type of refrigerant used

remain unaffected

9 / 50

A large Roynold number is indication of________________?

highly turbulent flow

laminar flow

steady flow

smooth and streamline flow

10 / 50

An example of amorphous material is____________?

zinc

glass

lead

silver

11 / 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 friction

force of adhesion

force of cohesion

12 / 50

Antifriction bearings are__________________?

hydrodynamic bearings

sleeve bearings

thin lubricated bearings

none of the above

13 / 50

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

suction port and transfer port

suction port and exhaust port

suction port, exhaust port and transfer port

transfer port only

14 / 50

Which is more viscous lub oil_________________?

SAE 80

SEA 30

SAE 4?

SAE 50

15 / 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-lt

6f-4

6f-8

3t2+2t

16 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

17 / 50

Mach number is significant in_____________________?

supersonics, as with projectiles and jet propulsion

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

18 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

evaparator

expansion valve

condenser

19 / 50

Work study is concerned with_________________?

improving production planning and control

motivation of workers

improving present method and finding standard time

improving production capability

20 / 50

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

3/-2

2/-3

j-2

2j-l

21 / 50

Density of water is maximum at__________________?

0?K

4?C

100?C

0?C

22 / 50

Work done is zero for the following process_________________?

throttling

free expansion

constant volume

all Of the above

23 / 50

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

yielding point of the material

plastic point of the material

breaking point of the material

elastic point of the material

24 / 50

The knock in diesel engine occurs due to____________________?

instantaneous and rapid burning of the first part of the charge

instantaneous atuo iginition of last part of charge

reduction of delay period

delayed burning of the first part of the charge

25 / 50

Combustion in compression ignition engines is____________________?

heterogeneous

homogeneous

None

laminar

26 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.1 to 0.2%

0.6 to 0.7%

0.7 to 0.9%

27 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

motion study of a sequence of operations conducted systematically

analysis of a man-work method by using a motion picture camera with a timing device in the field of view

motion study* observed on enhanced time intervals

28 / 50

A nuclear unit becoming critical means_______________?

there is danger of nuclear spread

it is capable of generating much more than rated capacity

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

it is generating power to rated capacity

29 / 50

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

speed

altitude

speed

Vspeed

30 / 50

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

wood-ruff key

gib head key

feather key

flat saddle key

31 / 50

Capillary action is due to the_________________?

cohesion of the liquid

surface tension

all of the above

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

32 / 50

Steel made from phosphatic iron is_________________?

ductile

brittle

tough

hard

33 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different heat contents

different specific heat

different temperatures

34 / 50

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

better mechanical balance

less loss of air due to leakage past the cylinder

lower volumetric efficiency

less power requirement

35 / 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

36 / 50

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

viscosity index

coefficient of viscosity

specific viscosity

kinematic viscosity

37 / 50

Critical Path Net Work helps an engineer_________________?

all of the above

to concentrate his attention on critical activities

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

38 / 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

39 / 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

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

gases have two values of specific heat

40 / 50

The main advantage of line organisation is its_______________?

effective command and control

defined responsibilities at all levels

rigid discipline in the organisation

all of the above

41 / 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

Carbon dioxide

Ammonia

42 / 50

String diagram is used when__________________?

team of workers is working at a place

material handling is to be done

all of the above

idle time is to be reduced

43 / 50

Time study is__________________?

time taken by workers to do a job

machine setting time

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

method of fixing time for workers

44 / 50

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

burning the oil

heating the oil in the settling tanks

cooling the oil in the settling tanks

suspension

45 / 50

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

equilateral triangle

right angled triangle

circle

square

46 / 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________________?

completely reversed loading

dynamic loading

combined static and dynamic loading

static loading

47 / 50

The draw of cotter need not exceed_________________?

5 mm

10 mm

20 mm

3 mm

48 / 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

49 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant volume

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

Lower calorific value at constant pressure

50 / 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

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