Mechanical Engineering Quiz 8

1 / 50

Heat flows from one body to other when they have_________________?

different heat contents

different temperatures

different specific heat

different atomic structure

2 / 50

Presence of moisture in a refrigerant affects the working of___________________?

compressor

expansion valve

evaparator

condenser

3 / 50

A boiling water reactor uses following as fuel________________?

plutonium

enriched uranium

thorium

4 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

5 / 50

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

p = T/r

p = T/2r

p = Txr

p = 2T/r

6 / 50

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

0.15 m3/kg mol

4.17m3/kgmol

400 m3/kg mol

41.7 m3/kg mol

7 / 50

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

speed

Vspeed

altitude

8 / 50

Detonation is caused by the following unstable compounds______________________?

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

peroxides, aldehydes and ketones

aldehydes, oxides and ketones

9 / 50

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

gib head key

flat saddle key

wood-ruff key

feather key

10 / 50

Work done is zero for the following process_________________?

constant volume

throttling

free expansion

all Of the above

11 / 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

3t2+2t

6f-4

6f-8

12 / 50

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

specific viscosity

kinematic viscosity

viscosity index

coefficient of viscosity

13 / 50

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

2j-l

j-2

2/-3

3/-2

14 / 50

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

data are insufficient to determine it

it is a marginal case

yes

15 / 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________________?

dynamic loading

static loading

combined static and dynamic loading

completely reversed loading

16 / 50

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

right angled triangle

circle

equilateral triangle

square

17 / 50

The main advantage of line organisation is its_______________?

rigid discipline in the organisation

effective command and control

defined responsibilities at all levels

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

A large Roynold number is indication of________________?

steady flow

smooth and streamline flow

highly turbulent flow

laminar flow

20 / 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

21 / 50

Antifriction bearings are__________________?

sleeve bearings

thin lubricated bearings

hydrodynamic bearings

none of the above

22 / 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

23 / 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

24 / 50

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

less power requirement

less loss of air due to leakage past the cylinder

lower volumetric efficiency

better mechanical balance

25 / 50

Drop forging dies contain carbon of the order of_________________?

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

26 / 50

The draw of cotter need not exceed_________________?

10 mm

3 mm

5 mm

20 mm

27 / 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

elastic point of the material

plastic point of the material

28 / 50

String diagram is used when__________________?

all of the above

idle time is to be reduced

team of workers is working at a place

material handling is to be done

29 / 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

surface tension

all of the above

30 / 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___________________?

8 tonnes/cm2

16 tonnes/cm2

4 tonnes/cm2

22 tonnes/cm2

31 / 50

Combustion in compression ignition engines is____________________?

None

homogeneous

heterogeneous

laminar

32 / 50

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

decrease

increase

remain unaffected

may increase or decrease depending on the type of refrigerant used

33 / 50

Micro motion study is__________________?

study of man and machine conducted simultaneously

motion study* observed on enhanced time intervals

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

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________________?

N/Zp

Z/pN

ZN/p

p/ZN

35 / 50

Which is more viscous lub oil_________________?

SAE 50

SEA 30

SAE 4?

SAE 80

36 / 50

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

transfer port only

suction port and exhaust port

suction port, exhaust port and transfer port

suction port and transfer port

37 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.40%

0.20%

0.10%

0.60%

38 / 50

An example of amorphous material is____________?

silver

glass

zinc

lead

39 / 50

An engine indicator is used to determine the following___________________?

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

volume of cylinder

speed

temperature

40 / 50

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

heating the oil in the settling tanks

suspension

burning the oil

cooling the oil in the settling tanks

41 / 50

Steel made from phosphatic iron is_________________?

ductile

hard

brittle

tough

42 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the flow of material in the plant

the methods of proper utilization of manpower

the methods of proper utilization of machines

43 / 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

44 / 50

Critical Path Net Work helps an engineer_________________?

to concentrate his attention on critical activities

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

all of the above

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

45 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

minimum pressure

average pressure

maximum pressure developed

instantaneous pressure at any instant

46 / 50

Work study is concerned with_________________?

improving production capability

improving production planning and control

motivation of workers

improving present method and finding standard time

47 / 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

48 / 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

49 / 50

Time study is__________________?

time taken by workers to do a job

machine setting time

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

method of fixing time for workers

50 / 50

Density of water is maximum at__________________?

100?C

0?K

4?C

0?C

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