Mechanical Engineering Quiz 8

1 / 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

increase

decrease

remain unaffected

2 / 50

The main advantage of line organisation is its_______________?

rigid discipline in the organisation

all of the above

effective command and control

defined responsibilities at all levels

3 / 50

Detonation is caused by the following unstable compounds______________________?

aldehydes, oxides and ketones

peroxides, aldehydes, oxides and sul-phides

ketones and sulphur compounds

peroxides, aldehydes and ketones

4 / 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

Ammonia

Brine

5 / 50

Steel made from phosphatic iron is_________________?

tough

ductile

hard

brittle

6 / 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 cohesion

force of diffusion

7 / 50

Critical Path Net Work helps an engineer_________________?

all of the above

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

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

8 / 50

The draw of cotter need not exceed_________________?

10 mm

20 mm

3 mm

5 mm

9 / 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

sinking fund method

straight line method

annuity charging method

10 / 50

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

equilateral triangle

square

circle

right angled triangle

11 / 50

Combustion in compression ignition engines is____________________?

homogeneous

heterogeneous

None

laminar

12 / 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

13 / 50

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

data are insufficient to determine it

yes

it is a marginal case

14 / 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

all of fhe above

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

15 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

Lower calorific value at constant pressure

Higher calorific value at constant volume

16 / 50

Work study is concerned with_________________?

motivation of workers

improving production planning and control

improving present method and finding standard time

improving production capability

17 / 50

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

speed

Vspeed

altitude

speed

18 / 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

cohesion of the liquid

surface tension

19 / 50

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

2/-3

3/-2

2j-l

j-2

20 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of machines

the methods of proper utilization of manpower

the layout of factory facilities

the flow of material in the plant

21 / 50

A nuclear unit becoming critical means_______________?

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

there is danger of nuclear spread

22 / 50

An engine indicator is used to determine the following___________________?

volume of cylinder

temperature

speed

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

23 / 50

A large Roynold number is indication of________________?

smooth and streamline flow

steady flow

highly turbulent flow

laminar flow

24 / 50

Which is more viscous lub oil_________________?

SAE 80

SAE 50

SEA 30

SAE 4?

25 / 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

yielding point of the material

plastic point of the material

elastic point of the material

26 / 50

A boiling water reactor uses following as fuel________________?

enriched uranium

thorium

plutonium

27 / 50

Work done is zero for the following process_________________?

constant volume

free expansion

all Of the above

throttling

28 / 50

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

flat saddle key

gib head key

feather key

wood-ruff key

29 / 50

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

specific viscosity

kinematic viscosity

viscosity index

coefficient of viscosity

30 / 50

An example of amorphous material is____________?

zinc

silver

lead

glass

31 / 50

Antifriction bearings are__________________?

sleeve bearings

thin lubricated bearings

none of the above

hydrodynamic bearings

32 / 50

String diagram is used when__________________?

team of workers is working at a place

all of the above

material handling is to be done

idle time is to be reduced

33 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.10%

0.60%

0.20%

0.40%

34 / 50

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

p = 2T/r

p = T/2r

p = T/r

p = Txr

35 / 50

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

better mechanical balance

less power requirement

lower volumetric efficiency

less loss of air due to leakage past the cylinder

36 / 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 __________________?

6f-4

6f-8

3t2-lt

3t2+2t

37 / 50

Drop forging dies contain carbon of the order of_________________?

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

0.7 to 0.9%

38 / 50

Presence of moisture in a refrigerant affects the working of___________________?

expansion valve

condenser

evaparator

compressor

39 / 50

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

transfer port only

suction port and transfer port

suction port, exhaust port and transfer port

suction port and exhaust port

40 / 50

Density of water is maximum at__________________?

4?C

100?C

0?C

0?K

41 / 50

The knock in diesel engine occurs due to____________________?

instantaneous and rapid burning of the first part of the charge

instantaneous atuo iginition of last part of charge

reduction of delay period

delayed burning of the first part of the charge

42 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

average pressure

maximum pressure developed

instantaneous pressure at any instant

minimum pressure

43 / 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

8 tonnes/cm2

22 tonnes/cm2

4 tonnes/cm2

44 / 50

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

41.7 m3/kg mol

4.17m3/kgmol

0.15 m3/kg mol

400 m3/kg mol

45 / 50

Time study is__________________?

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

method of fixing time for workers

46 / 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

47 / 50

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

burning the oil

suspension

heating the oil in the settling tanks

cooling the oil in the settling tanks

48 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different specific heat

different heat contents

different temperatures

49 / 50

According to Avogadro?s Hypothesis ______________________?

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

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

gases have two values of specific heat

50 / 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

combined static and dynamic loading

dynamic loading

static loading

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