Mechanical Engineering Quiz 8

1 / 50

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

better mechanical balance

lower volumetric efficiency

less loss of air due to leakage past the cylinder

less power requirement

2 / 50

An example of amorphous material is____________?

lead

glass

zinc

silver

3 / 50

Work study is concerned with_________________?

motivation of workers

improving production planning and control

improving present method and finding standard time

improving production capability

4 / 50

Density of water is maximum at__________________?

4?C

100?C

0?C

0?K

5 / 50

The draw of cotter need not exceed_________________?

10 mm

20 mm

5 mm

3 mm

6 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different specific heat

different heat contents

different atomic structure

7 / 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

8 / 50

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

Vspeed

speed

altitude

speed

9 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the methods of proper utilization of machines

the methods of proper utilization of manpower

the flow of material in the plant

10 / 50

The main advantage of line organisation is its_______________?

all of the above

effective command and control

rigid discipline in the organisation

defined responsibilities at all levels

11 / 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

12 / 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

Z/pN

N/Zp

ZN/p

13 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

speed

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

temperature

14 / 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

15 / 50

Critical Path Net Work helps an engineer_________________?

all of the above

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

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

to concentrate his attention on critical activities

16 / 50

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

feather key

gib head key

wood-ruff key

flat saddle key

17 / 50

Capillary action is due to the_________________?

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

cohesion of the liquid

surface tension

all of the above

18 / 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

A-B-C charging method

sinking fund method

straight line method

19 / 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

supersonics, as with projectiles and jet propulsion

all of fhe above

20 / 50

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

square

right angled triangle

circle

equilateral triangle

21 / 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

22 / 50

Work done is zero for the following process_________________?

throttling

free expansion

constant volume

all Of the above

23 / 50

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

p = Txr

p = T/r

p = T/2r

p = 2T/r

24 / 50

Steel made from phosphatic iron is_________________?

ductile

hard

tough

brittle

25 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

condenser

expansion valve

evaparator

26 / 50

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

specific viscosity

coefficient of viscosity

viscosity index

kinematic viscosity

27 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.1 to 0.2%

0.7 to 0.9%

0.6 to 0.7%

28 / 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

16 tonnes/cm2

22 tonnes/cm2

29 / 50

Which is more viscous lub oil_________________?

SAE 80

SEA 30

SAE 4?

SAE 50

30 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant volume

Lower calorific value at constant pressure

Higher calorific value at constant pressure

Lower calorific value at constant volume ,

31 / 50

A large Roynold number is indication of________________?

steady flow

laminar flow

highly turbulent flow

smooth and streamline flow

32 / 50

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

400 m3/kg mol

41.7 m3/kg mol

4.17m3/kgmol

0.15 m3/kg mol

33 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.60%

0.40%

0.20%

0.10%

34 / 50

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

2/-3

3/-2

2j-l

j-2

35 / 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

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

36 / 50

A nuclear unit becoming critical means_______________?

it is generating power to rated capacity

there is danger of nuclear spread

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

it is capable of generating much more than rated capacity

37 / 50

String diagram is used when__________________?

material handling is to be done

team of workers is working at a place

idle time is to be reduced

all of the above

38 / 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-lt

3t2+2t

39 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

instantaneous and rapid burning of the first part of the charge

reduction of delay period

delayed burning of the first part of the charge

40 / 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

increase

remain unaffected

decrease

41 / 50

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

heating the oil in the settling tanks

cooling the oil in the settling tanks

burning the oil

suspension

42 / 50

Combustion in compression ignition engines is____________________?

None

homogeneous

laminar

heterogeneous

43 / 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

static loading

dynamic loading

combined static and dynamic loading

44 / 50

A boiling water reactor uses following as fuel________________?

plutonium

thorium

enriched uranium

45 / 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

motion study of a sequence of operations conducted systematically

motion study* observed on enhanced time intervals

study of man and machine conducted simultaneously

46 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

minimum pressure

average pressure

instantaneous pressure at any instant

maximum pressure developed

47 / 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

Brine

Ammonia

48 / 50

Antifriction bearings are__________________?

sleeve bearings

thin lubricated bearings

none of the above

hydrodynamic bearings

49 / 50

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

force of friction

force of adhesion

force of cohesion

force of diffusion

50 / 50

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

suction port, exhaust port and transfer port

suction port and transfer port

suction port and exhaust port

transfer port only

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