Mechanical Engineering Quiz 8

1 / 50

A nuclear unit becoming critical means_______________?

it is capable of generating much more than rated capacity

it is generating power to rated capacity

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

there is danger of nuclear spread

2 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.40%

0.60%

0.10%

3 / 50

An engine indicator is used to determine the following___________________?

temperature

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

volume of cylinder

speed

4 / 50

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

speed

altitude

speed

Vspeed

5 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different heat contents

different temperatures

different atomic structure

6 / 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

Ammonia

Brine

Carbon dioxide

7 / 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

8 / 50

An example of amorphous material is____________?

silver

lead

zinc

glass

9 / 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________________?

static loading

dynamic loading

combined static and dynamic loading

completely reversed loading

10 / 50

Routing assists engineers in deciding in advance___________________?

the flow of material in the plant

the methods of proper utilization of manpower

the layout of factory facilities

the methods of proper utilization of machines

11 / 50

Antifriction bearings are__________________?

hydrodynamic bearings

sleeve bearings

thin lubricated bearings

none of the above

12 / 50

Steel made from phosphatic iron is_________________?

tough

hard

brittle

ductile

13 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

reduction of delay period

14 / 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 diffusion

force of adhesion

force of friction

15 / 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

16 / 50

Time study is__________________?

machine setting time

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

17 / 50

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

it is a marginal case

data are insufficient to determine it

yes

18 / 50

The main advantage of line organisation is its_______________?

all of the above

defined responsibilities at all levels

effective command and control

rigid discipline in the organisation

19 / 50

Density of water is maximum at__________________?

100?C

0?C

4?C

0?K

20 / 50

Drop forging dies contain carbon of the order of_________________?

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

21 / 50

A boiling water reactor uses following as fuel________________?

plutonium

enriched uranium

thorium

22 / 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

remain unaffected

increase

decrease

23 / 50

Combustion in compression ignition engines is____________________?

None

heterogeneous

homogeneous

laminar

24 / 50

Work study is concerned with_________________?

improving production capability

improving present method and finding standard time

motivation of workers

improving production planning and control

25 / 50

Micro motion study is__________________?

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

study of man and machine conducted simultaneously

26 / 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

6f-8

3t2+2t

27 / 50

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

viscosity index

kinematic viscosity

specific viscosity

coefficient of viscosity

28 / 50

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

p = 2T/r

p = T/r

p = Txr

p = T/2r

29 / 50

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

better mechanical balance

less power requirement

less loss of air due to leakage past the cylinder

lower volumetric efficiency

30 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant pressure

Higher calorific value at constant volume

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

31 / 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

yielding point of the material

plastic point of the material

elastic point of the material

32 / 50

A large Roynold number is indication of________________?

smooth and streamline flow

highly turbulent flow

laminar flow

steady flow

33 / 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

22 tonnes/cm2

4 tonnes/cm2

8 tonnes/cm2

34 / 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________________?

p/ZN

ZN/p

Z/pN

N/Zp

35 / 50

The draw of cotter need not exceed_________________?

5 mm

3 mm

20 mm

10 mm

36 / 50

Work done is zero for the following process_________________?

free expansion

constant volume

throttling

all Of the above

37 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

condenser

expansion valve

evaparator

38 / 50

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

transfer port only

suction port and transfer port

suction port and exhaust port

suction port, exhaust port and transfer port

39 / 50

Which is more viscous lub oil_________________?

SAE 80

SAE 4?

SEA 30

SAE 50

40 / 50

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

burning the oil

cooling the oil in the settling tanks

heating the oil in the settling tanks

suspension

41 / 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

sinking fund method

A-B-C charging method

straight line method

42 / 50

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

3/-2

j-2

2j-l

2/-3

43 / 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

44 / 50

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

41.7 m3/kg mol

0.15 m3/kg mol

4.17m3/kgmol

400 m3/kg mol

45 / 50

Detonation is caused by the following unstable compounds______________________?

aldehydes, oxides and ketones

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

peroxides, aldehydes and ketones

46 / 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

47 / 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

48 / 50

According to Avogadro?s Hypothesis ______________________?

gases have two values of specific heat

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

49 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

minimum pressure

instantaneous pressure at any instant

maximum pressure developed

average pressure

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

to concentrate his attention on critical activities

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