Mechanical Engineering Quiz 8

1 / 50

Presence of moisture in a refrigerant affects the working of___________________?

expansion valve

compressor

condenser

evaparator

2 / 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-8

6f-4

3t2+2t

3 / 50

Time study is__________________?

method of fixing time for workers

machine setting time

time taken by workers to do a job

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

4 / 50

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

burning the oil

cooling the oil in the settling tanks

suspension

heating the oil in the settling tanks

5 / 50

A large Roynold number is indication of________________?

steady flow

laminar flow

smooth and streamline flow

highly turbulent flow

6 / 50

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

suction port, exhaust port and transfer port

transfer port only

suction port and exhaust port

suction port and transfer port

7 / 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

8 / 50

Routing assists engineers in deciding in advance___________________?

the flow of material in the plant

the methods of proper utilization of machines

the methods of proper utilization of manpower

the layout of factory facilities

9 / 50

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

2/-3

2j-l

3/-2

j-2

10 / 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* observed on enhanced time intervals

motion study of a sequence of operations conducted systematically

11 / 50

Antifriction bearings are__________________?

thin lubricated bearings

sleeve bearings

none of the above

hydrodynamic bearings

12 / 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 friction

force of diffusion

force of cohesion

13 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.6 to 0.7%

0.1 to 0.2%

0.7 to 0.9%

14 / 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

15 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different temperatures

different heat contents

different specific heat

16 / 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

p/ZN

ZN/p

Z/pN

17 / 50

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

altitude

speed

Vspeed

18 / 50

An engine indicator is used to determine the following___________________?

temperature

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

speed

volume of cylinder

19 / 50

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

equilateral triangle

circle

right angled triangle

square

20 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

21 / 50

Density of water is maximum at__________________?

100?C

0?K

0?C

4?C

22 / 50

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

gib head key

feather key

flat saddle key

wood-ruff key

23 / 50

A nuclear unit becoming critical means_______________?

it is generating power to rated capacity

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

24 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.40%

0.20%

0.10%

0.60%

25 / 50

Critical Path Net Work helps an engineer_________________?

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

to concentrate his attention on critical activities

26 / 50

Combustion in compression ignition engines is____________________?

homogeneous

None

laminar

heterogeneous

27 / 50

Work done is zero for the following process_________________?

all Of the above

throttling

constant volume

free expansion

28 / 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

29 / 50

An example of amorphous material is____________?

silver

glass

lead

zinc

30 / 50

Mach number is significant in_____________________?

supersonics, as with projectiles and jet propulsion

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.

all of fhe above

31 / 50

Steel made from phosphatic iron is_________________?

ductile

brittle

tough

hard

32 / 50

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

elastic point of the material

yielding point of the material

plastic point of the material

breaking point of the material

33 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

aldehydes, oxides and ketones

34 / 50

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

decrease

remain unaffected

may increase or decrease depending on the type of refrigerant used

increase

35 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

instantaneous pressure at any instant

average pressure

maximum pressure developed

minimum pressure

36 / 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

Brine

Ammonia

Freon

37 / 50

The knock in diesel engine occurs due to____________________?

instantaneous atuo iginition of last part of charge

reduction of delay period

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

38 / 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_____________________?

A-B-C charging method

annuity charging method

straight line method

sinking fund method

39 / 50

Work study is concerned with_________________?

improving production capability

motivation of workers

improving present method and finding standard time

improving production planning and control

40 / 50

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

kinematic viscosity

viscosity index

coefficient of viscosity

specific viscosity

41 / 50

The draw of cotter need not exceed_________________?

20 mm

5 mm

10 mm

3 mm

42 / 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

4 tonnes/cm2

8 tonnes/cm2

22 tonnes/cm2

43 / 50

The main advantage of line organisation is its_______________?

rigid discipline in the organisation

defined responsibilities at all levels

all of the above

effective command and control

44 / 50

Which is more viscous lub oil_________________?

SAE 80

SAE 4?

SAE 50

SEA 30

45 / 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

46 / 50

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

4.17m3/kgmol

400 m3/kg mol

0.15 m3/kg mol

41.7 m3/kg mol

47 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

thorium

plutonium

48 / 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

49 / 50

String diagram is used when__________________?

material handling is to be done

idle time is to be reduced

all of the above

team of workers is working at a place

50 / 50

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

p = Txr

p = T/r

p = 2T/r

p = T/2r

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