Mechanical Engineering Quiz 8

1 / 50

Bomb calorimeter is used to determine ___________________?

Lower calorific value at constant pressure

Lower calorific value at constant volume ,

Higher calorific value at constant pressure

Higher calorific value at constant volume

2 / 50

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

remain unaffected

may increase or decrease depending on the type of refrigerant used

increase

decrease

3 / 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 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

4 / 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

5 / 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

6 / 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

dynamic loading

combined static and dynamic loading

static loading

7 / 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

8 / 50

Time study is__________________?

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

method of fixing time for workers

9 / 50

Work done is zero for the following process_________________?

constant volume

free expansion

all Of the above

throttling

10 / 50

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

gib head key

feather key

flat saddle key

wood-ruff key

11 / 50

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

suction port and transfer port

transfer port only

suction port, exhaust port and transfer port

suction port and exhaust port

12 / 50

Capillary action is due to the_________________?

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

cohesion of the liquid

all of the above

surface tension

13 / 50

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

square

equilateral triangle

right angled triangle

circle

14 / 50

An example of amorphous material is____________?

lead

zinc

silver

glass

15 / 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

Z/pN

ZN/p

16 / 50

The mean effective pressure obtained from engine indicator indicates the________________?

minimum pressure

average pressure

maximum pressure developed

instantaneous pressure at any instant

17 / 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

6f-8

3t2-lt

6f-4

18 / 50

A large Roynold number is indication of________________?

steady flow

smooth and streamline flow

highly turbulent flow

laminar flow

19 / 50

Work study is concerned with_________________?

improving present method and finding standard time

improving production capability

motivation of workers

improving production planning and control

20 / 50

Critical Path Net Work helps an engineer_________________?

all of the above

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

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

21 / 50

Combustion in compression ignition engines is____________________?

None

homogeneous

laminar

heterogeneous

22 / 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

straight line method

A-B-C charging method

annuity charging method

23 / 50

Density of water is maximum at__________________?

0?C

100?C

4?C

0?K

24 / 50

Heat flows from one body to other when they have_________________?

different atomic structure

different heat contents

different temperatures

different specific heat

25 / 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

motion study of a sequence of operations conducted systematically

motion study* observed on enhanced time intervals

study of man and machine conducted simultaneously

26 / 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

Carbon dioxide

Ammonia

27 / 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%

28 / 50

The draw of cotter need not exceed_________________?

3 mm

20 mm

10 mm

5 mm

29 / 50

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

burning the oil

suspension

cooling the oil in the settling tanks

heating the oil in the settling tanks

30 / 50

Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones

ketones and sulphur compounds

peroxides, aldehydes, oxides and sul-phides

aldehydes, oxides and ketones

31 / 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

32 / 50

Presence of moisture in a refrigerant affects the working of___________________?

expansion valve

evaparator

compressor

condenser

33 / 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

better mechanical balance

lower volumetric efficiency

34 / 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

35 / 50

String diagram is used when__________________?

all of the above

material handling is to be done

idle time is to be reduced

team of workers is working at a place

36 / 50

A boiling water reactor uses following as fuel________________?

plutonium

enriched uranium

thorium

37 / 50

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

speed

altitude

Vspeed

38 / 50

The main advantage of line organisation is its_______________?

effective command and control

defined responsibilities at all levels

all of the above

rigid discipline in the organisation

39 / 50

Routing assists engineers in deciding in advance___________________?

the methods of proper utilization of machines

the layout of factory facilities

the methods of proper utilization of manpower

the flow of material in the plant

40 / 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

there is danger of nuclear spread

it is generating power to rated capacity

41 / 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

instantaneous atuo iginition of last part of charge

reduction of delay period

42 / 50

Antifriction bearings are__________________?

thin lubricated bearings

sleeve bearings

hydrodynamic bearings

none of the above

43 / 50

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

elastic point of the material

plastic point of the material

yielding point of the material

breaking point of the material

44 / 50

Cold rolled steel sheets contain carbon of the following order___________________?

0.20%

0.60%

0.40%

0.10%

45 / 50

Steel made from phosphatic iron is_________________?

tough

ductile

hard

brittle

46 / 50

An engine indicator is used to determine the following___________________?

speed

volume of cylinder

temperature

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

47 / 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 cohesion

force of diffusion

force of friction

48 / 50

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

2/-3

2j-l

3/-2

j-2

49 / 50

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

kinematic viscosity

coefficient of viscosity

viscosity index

specific viscosity

50 / 50

Which is more viscous lub oil_________________?

SAE 80

SAE 50

SEA 30

SAE 4?

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