Mechanical Engineering Quiz 8

1 / 50

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

flat saddle key

wood-ruff key

feather key

gib head key

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

3t2+2t

6f-4

3 / 50

Presence of moisture in a refrigerant affects the working of___________________?

evaparator

expansion valve

condenser

compressor

4 / 50

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

transfer port only

suction port, exhaust port and transfer port

suction port and transfer port

suction port and exhaust port

5 / 50

Steel made from phosphatic iron is_________________?

hard

tough

ductile

brittle

6 / 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

7 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

instantaneous pressure at any instant

maximum pressure developed

minimum pressure

average pressure

8 / 50

Capillary action is due to the_________________?

all of the above

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

surface tension

cohesion of the liquid

9 / 50

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

better mechanical balance

lower volumetric efficiency

less power requirement

less loss of air due to leakage past the cylinder

10 / 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

11 / 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

12 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes, oxides and sul-phides

ketones and sulphur compounds

aldehydes, oxides and ketones

peroxides, aldehydes and ketones

13 / 50

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

j-2

3/-2

2j-l

2/-3

14 / 50

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

cooling the oil in the settling tanks

suspension

burning the oil

heating the oil in the settling tanks

15 / 50

Heat flows from one body to other when they have_________________?

different temperatures

different specific heat

different heat contents

different atomic structure

16 / 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_____________________?

straight line method

sinking fund method

A-B-C charging method

annuity charging method

17 / 50

The main advantage of line organisation is its_______________?

effective command and control

rigid discipline in the organisation

all of the above

defined responsibilities at all levels

18 / 50

Antifriction bearings are__________________?

thin lubricated bearings

hydrodynamic bearings

sleeve bearings

none of the above

19 / 50

A nuclear unit becoming critical means_______________?

there is danger of nuclear spread

it is generating power to rated capacity

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

it is capable of generating much more than rated capacity

20 / 50

Drop forging dies contain carbon of the order of_________________?

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

21 / 50

The knock in diesel engine occurs due to____________________?

reduction of delay period

instantaneous atuo iginition of last part of charge

instantaneous and rapid burning of the first part of the charge

delayed burning of the first part of the charge

22 / 50

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

0.15 m3/kg mol

41.7 m3/kg mol

4.17m3/kgmol

400 m3/kg mol

23 / 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

dynamic loading

completely reversed loading

24 / 50

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

viscosity index

coefficient of viscosity

specific viscosity

kinematic viscosity

25 / 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

decrease

increase

26 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.60%

0.20%

0.40%

27 / 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

16 tonnes/cm2

4 tonnes/cm2

8 tonnes/cm2

28 / 50

A large Roynold number is indication of________________?

laminar flow

steady flow

highly turbulent flow

smooth and streamline flow

29 / 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

study of man and machine conducted simultaneously

motion study* observed on enhanced time intervals

30 / 50

An example of amorphous material is____________?

glass

zinc

silver

lead

31 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

thorium

plutonium

32 / 50

Critical Path Net Work helps an engineer_________________?

to concentrate his attention on critical activities

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

33 / 50

String diagram is used when__________________?

all of the above

material handling is to be done

team of workers is working at a place

idle time is to be reduced

34 / 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

breaking point of the material

plastic point of the material

elastic point of the material

35 / 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 diffusion

force of cohesion

36 / 50

Work done is zero for the following process_________________?

constant volume

all Of the above

throttling

free expansion

37 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

temperature

speed

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

38 / 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

39 / 50

Density of water is maximum at__________________?

4?C

0?K

0?C

100?C

40 / 50

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

circle

right angled triangle

square

equilateral triangle

41 / 50

Combustion in compression ignition engines is____________________?

None

homogeneous

heterogeneous

laminar

42 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of manpower

the layout of factory facilities

the methods of proper utilization of machines

the flow of material in the plant

43 / 50

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

altitude

speed

Vspeed

speed

44 / 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

Z/pN

ZN/p

p/ZN

45 / 50

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

p = Txr

p = T/2r

p = T/r

p = 2T/r

46 / 50

The draw of cotter need not exceed_________________?

10 mm

3 mm

20 mm

5 mm

47 / 50

According to Avogadro?s Hypothesis ______________________?

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

product of the gas constant and the molecular weight of an ideal gas is constant

gases have two values of specific heat

48 / 50

Work study is concerned with_________________?

improving present method and finding standard time

improving production planning and control

motivation of workers

improving production capability

49 / 50

Which is more viscous lub oil_________________?

SEA 30

SAE 50

SAE 80

SAE 4?

50 / 50

Mach number is significant in_____________________?

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

full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

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