Mechanical Engineering Quiz 8

1 / 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

2 / 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

3 / 50

Density of water is maximum at__________________?

0?K

4?C

100?C

0?C

4 / 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

41.7 m3/kg mol

0.15 m3/kg mol

5 / 50

Steel made from phosphatic iron is_________________?

hard

tough

ductile

brittle

6 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

condenser

expansion valve

evaparator

7 / 50

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

p = T/r

p = Txr

p = 2T/r

p = T/2r

8 / 50

Work study is concerned with_________________?

improving production capability

improving present method and finding standard time

motivation of workers

improving production planning and control

9 / 50

A large Roynold number is indication of________________?

laminar flow

smooth and streamline flow

highly turbulent flow

steady flow

10 / 50

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

viscosity index

kinematic viscosity

specific viscosity

coefficient of viscosity

11 / 50

Antifriction bearings are__________________?

hydrodynamic bearings

sleeve bearings

thin lubricated bearings

none of the above

12 / 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

13 / 50

According to Avogadro?s Hypothesis ______________________?

gases have two values of specific heat

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

the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

14 / 50

The knock in diesel engine occurs due to____________________?

reduction of delay period

instantaneous and rapid burning of the first part of the charge

instantaneous atuo iginition of last part of charge

delayed burning of the first part of the charge

15 / 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

16 / 50

A nuclear unit becoming critical means_______________?

it is capable of generating much more than rated capacity

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

there is danger of nuclear spread

it is generating power to rated capacity

17 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of machines

the flow of material in the plant

the layout of factory facilities

the methods of proper utilization of manpower

18 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes, oxides and sul-phides

ketones and sulphur compounds

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

19 / 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 of a sequence of operations conducted systematically

motion study* observed on enhanced time intervals

20 / 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.

all of fhe above

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

21 / 50

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

2/-3

2j-l

j-2

3/-2

22 / 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%

23 / 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

plastic point of the material

yielding point of the material

elastic point of the material

24 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant volume ,

Lower calorific value at constant pressure

Higher calorific value at constant volume

Higher calorific value at constant pressure

25 / 50

Time study is__________________?

method of fixing time for workers

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

26 / 50

The main advantage of line organisation is its_______________?

all of the above

effective command and control

defined responsibilities at all levels

rigid discipline in the organisation

27 / 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

better mechanical balance

less power requirement

lower volumetric efficiency

28 / 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________________?

ZN/p

N/Zp

p/ZN

Z/pN

29 / 50

An example of amorphous material is____________?

glass

silver

zinc

lead

30 / 50

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

circle

square

right angled triangle

equilateral triangle

31 / 50

Work done is zero for the following process_________________?

free expansion

all Of the above

constant volume

throttling

32 / 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

combined static and dynamic loading

completely reversed loading

dynamic loading

33 / 50

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

Vspeed

altitude

speed

34 / 50

The draw of cotter need not exceed_________________?

5 mm

3 mm

20 mm

10 mm

35 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

average pressure

minimum pressure

maximum pressure developed

instantaneous pressure at any instant

36 / 50

Combustion in compression ignition engines is____________________?

None

heterogeneous

homogeneous

laminar

37 / 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 diffusion

force of cohesion

force of adhesion

38 / 50

Which is more viscous lub oil_________________?

SAE 50

SAE 4?

SEA 30

SAE 80

39 / 50

A boiling water reactor uses following as fuel________________?

thorium

enriched uranium

plutonium

40 / 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

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

Ammonia

Carbon dioxide

42 / 50

Critical Path Net Work helps an engineer_________________?

to concentrate his attention on critical activities

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

43 / 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

A-B-C charging method

straight line method

44 / 50

String diagram is used when__________________?

all of the above

team of workers is working at a place

material handling is to be done

idle time is to be reduced

45 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.60%

0.40%

0.20%

46 / 50

Heat flows from one body to other when they have_________________?

different specific heat

different atomic structure

different temperatures

different heat contents

47 / 50

Capillary action is due to the_________________?

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

surface tension

all of the above

cohesion of the liquid

48 / 50

An engine indicator is used to determine the following___________________?

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

volume of cylinder

speed

temperature

49 / 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

22 tonnes/cm2

8 tonnes/cm2

50 / 50

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

suction port and transfer port

transfer port only

suction port and exhaust port

suction port, exhaust port and transfer port

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