Mechanical Engineering Quiz 8

1 / 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________________?

Freon

Carbon dioxide

Brine

Ammonia

2 / 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

3 / 50

Time study is__________________?

method of fixing time for workers

time taken by workers to do a job

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

machine setting time

4 / 50

Which is more viscous lub oil_________________?

SAE 50

SAE 80

SAE 4?

SEA 30

5 / 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

6 / 50

The draw of cotter need not exceed_________________?

10 mm

5 mm

3 mm

20 mm

7 / 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

8 tonnes/cm2

16 tonnes/cm2

4 tonnes/cm2

8 / 50

Presence of moisture in a refrigerant affects the working of___________________?

condenser

evaparator

compressor

expansion valve

9 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.60%

0.40%

0.10%

10 / 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

N/Zp

Z/pN

ZN/p

11 / 50

String diagram is used when__________________?

idle time is to be reduced

all of the above

team of workers is working at a place

material handling is to be done

12 / 50

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

altitude

Vspeed

speed

13 / 50

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

heating the oil in the settling tanks

burning the oil

cooling the oil in the settling tanks

suspension

14 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different specific heat

different heat contents

different temperatures

15 / 50

Micro motion study is__________________?

motion study* observed on enhanced time intervals

study of man and machine conducted simultaneously

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

16 / 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

17 / 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

annuity charging method

A-B-C charging method

sinking fund method

18 / 50

A large Roynold number is indication of________________?

smooth and streamline flow

laminar flow

highly turbulent flow

steady flow

19 / 50

Work study is concerned with_________________?

improving present method and finding standard time

motivation of workers

improving production planning and control

improving production capability

20 / 50

Routing assists engineers in deciding in advance___________________?

the layout of factory facilities

the methods of proper utilization of manpower

the flow of material in the plant

the methods of proper utilization of machines

21 / 50

An engine indicator is used to determine the following___________________?

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

speed

temperature

volume of cylinder

22 / 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

decrease

remain unaffected

increase

23 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

maximum pressure developed

minimum pressure

average pressure

instantaneous pressure at any instant

24 / 50

An example of amorphous material is____________?

zinc

silver

lead

glass

25 / 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

26 / 50

Density of water is maximum at__________________?

0?K

0?C

4?C

100?C

27 / 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+2t

3t2-lt

6f-8

6f-4

28 / 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

29 / 50

Bomb calorimeter is used to determine ___________________?

Higher calorific value at constant volume

Lower calorific value at constant pressure

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

30 / 50

Antifriction bearings are__________________?

hydrodynamic bearings

none of the above

thin lubricated bearings

sleeve bearings

31 / 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

32 / 50

The knock in diesel engine occurs due to____________________?

delayed burning of the first part of the charge

instantaneous and rapid burning of the first part of the charge

reduction of delay period

instantaneous atuo iginition of last part of charge

33 / 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

34 / 50

A boiling water reactor uses following as fuel________________?

plutonium

enriched uranium

thorium

35 / 50

The main advantage of line organisation is its_______________?

defined responsibilities at all levels

effective command and control

all of the above

rigid discipline in the organisation

36 / 50

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

plastic point of the material

breaking point of the material

yielding point of the material

elastic point of the material

37 / 50

Drop forging dies contain carbon of the order of_________________?

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

0.6 to 0.7%

38 / 50

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

400 m3/kg mol

0.15 m3/kg mol

4.17m3/kgmol

41.7 m3/kg mol

39 / 50

Work done is zero for the following process_________________?

free expansion

throttling

all Of the above

constant volume

40 / 50

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

j-2

2/-3

2j-l

3/-2

41 / 50

Capillary action is due to the_________________?

surface tension

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

cohesion of the liquid

all of the above

42 / 50

Steel made from phosphatic iron is_________________?

brittle

tough

hard

ductile

43 / 50

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

wood-ruff key

feather key

gib head key

flat saddle key

44 / 50

Critical Path Net Work helps an engineer_________________?

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

all of the above

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

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________________?

dynamic loading

completely reversed loading

static loading

combined static and dynamic loading

46 / 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

47 / 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

48 / 50

A nuclear unit becoming critical means_______________?

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

it is capable of generating much more than rated capacity

it is generating power to rated capacity

there is danger of nuclear spread

49 / 50

Combustion in compression ignition engines is____________________?

heterogeneous

None

laminar

homogeneous

50 / 50

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

coefficient of viscosity

specific viscosity

viscosity index

kinematic viscosity

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