Mechanical Engineering Quiz 7

1 / 50

The fatigue limit of a material____________________?

depends mainly on core composition

is greatly decreased by poor surface conditions

is dependent upon yield strength of material

remains same irrespective of surface conditions

2 / 50

Belt slip may occur due to________________?

all of the above

loose belt

driving pulley too small

heavy load

3 / 50

At low temperatures (say 75?C) the notched-bar impact value of steel____________________?

decreases markedly

remains same

increases markedly

depends on heat treatment carried out

4 / 50

When trying to turn a key into a lock, following is applied _____________________?

lever

couple

coplanar force

non-coplanar forces

5 / 50

In an isothermal process, the internal energy________________?

first increases and then decreases

remains constant

increases

decreases

6 / 50

An ideal flow of any fluid must fulfill the following____________________?

Newton?s law of motion

Continuity equation

Pascal? law

Newton?s law of viscosity

7 / 50

Which of the following is not the unit of power ?

kcal/sec

hp (horse power)

kW (kilowatt)

kcal/kg sec

8 / 50

In the opposed piston diesel engine, the combustion chamber is located________________?

above the piston (/;) below the piston

any when

between the pistons

None

9 / 50

In nodular iron, graphite is in the form of_____________________?

flakes

free carbon

cementite

spheroids

10 / 50

The maximum temperature in the I. engine cylinder is of the order of ________________?

500- 1000?C

1500-2000?C

2000-2500?C

1000- 1500?C

11 / 50

The technique for establishing and maintaining priorities among the various jobs of any project is known as___________________?

event flow scheduling technique

critical ratio scheduling

short interval scheduling

slotting technique for scheduling

12 / 50

Angle of action of cam is defined as the angle ____________________?

through which the cam rotates during the period in which the follower remains in the highest position

during which the follower returns to its initial position

moved by the cam from beginning of ascent to the termination of descent

of rotation of the cam for a definite displacement of the follower

13 / 50

The process of diffusion of one liquid into the other through a semi-permeable membrane is called_______________________?

surface tension

osmosis

viscosity

cohesion

14 / 50

Vertical lines on pressure-enthalpy chart show constant_______________?

total heat lines

entropy lines

pressure lines

temperature lines

15 / 50

The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be________________?

2-Aug

4-Aug

16 / 50

In accelerated circulation type boiler________________?

feed pump is employed to supplement natural circulation in water wall type furnace

None

water is supplied in drum and through downcomers? located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam

heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm

17 / 50

Which of the following is more appropriate for a moderator. One which_________________?

does not absorb neutrons

eats up neutrons

absorbs neutrons

accelerates neutrons

18 / 50

According to principle of transmissibility of forces, the effect of a force upon a body is_________________?

minimum when it acts at the C.G. of the body

the same at every point in its line of action

different at different points in its line of action

maximum when it acts at the center of gravity of a body

19 / 50

When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?

radiation

convection

conduction

conduction and convection

20 / 50

The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is____________________?

twice

same

eight times

four times

21 / 50

Turbofan engine employs ____________________ ?

two or more air streams

solid fuel firing

no air stream

one air stream

22 / 50

The first method invented for planning projects was________________?

programme evaluation and review technique (PERT)

critical path method (CPM)

bar chart method

milestone chart

23 / 50

The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?

2 to 4 m

1 to 1.75 m

1 tp 1.25m

1.75 to 2.75 m

24 / 50

The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?

1 micron

0.01 micron

10 microns

0.1 micron

25 / 50

Rotary compressor is best suited for_____________________?

large quantity of air at low pressure

large quantity of air at high pressure

small quantity of air at high pressure

small quantity of air at low pressure

26 / 50

Standard time as compared to normal time is_______________?

greater

there is no such correlation

equal

smaller

27 / 50

In designing air preheater, the important design consideration is that_________________?

approach temperature should be as low as possible

heat transfer area should be optimum

handling and maintenance should be easier

stack gases should not be cooled to the dew point

28 / 50

A slider crank chain consists of following numbers of turning and sliding pairs_________________?

4, 0

3, 1

I, 3

2, 2

29 / 50

Boiler H.P. is defined as the ________________ ?

the evaporation of 15.65 kg of water per hour from and at 100?C into dry saturated steam

work done in evaporating 1 kg of steam per hour from and at 100?C into dry saturated steam

steam evaporation rate per kg of fuel fired

work done by 1 kg of steam at saturation condition

30 / 50

The intensity of stress which causes unit strain is called_______________?

unit stress

bulk modulus

modulus of rigidity

modulus of elasticity

31 / 50

The ultimate tensile stress of mild steel compared to ultimate compressive stress is__________________?

less

same

more or less depending on other factors

32 / 50

The C.G. of a solid hemisphere lies on the central radius 3r________________?

at distance ? from the plane base 3r

at distance ? from the plane base or

at distance ? from the plane base 3r

33 / 50

Form coefficient of spring is _____________________?

its capability of storing energy

load required to produce unit deflection

concerned With strength of wire of spring

ratio of coil diameter to wire diameter

34 / 50

Violent sound pulsations within the cylinder of an IC. engine are caused due to_________________?

improved scavenging

heavy turbulence

detonation

heavy supercharging

35 / 50

In open combustion chamber in diesel engines____________________?

fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture

fuel is injected at atmospheric pres?sure

36 / 50

Any point on a link connecting double slider crank chain will trace a ________________?

circle

ellipse

straight line

parabola

37 / 50

Austenite rs a combination of_________________?

ferrite and austenite

cementite and gamma iron

ferrite and cementite

ferrite and iron graphite

38 / 50

A single force and a couple acting in the same plane upon a rigid body_________________?

cannot balance each other

are equivalent

balance each other

produce moment of a couple

39 / 50

Basic solution is one which has pH value___________________?

greater than 7

equal to 7

less than 7

pH value has nothing to do with basic solution

40 / 50

The term ?value? in value engineering refers to_______________?

total cost of the product

utility of the product

selling price of the product

manufactured cost of the product

41 / 50

Plutonium is produced________________?

by neutron irradiation of throium

as basic raw material

artificially

by neutron irradiation of Uz

42 / 50

The following is the inversion of slider crank chain mechanism______________________?

oscillating cylinder engine

Whitworth quick return mechanism

hand pump

all of the above

43 / 50

The crystal structure of brass is_________________?

H.C.P.

F.C.C.

Orthorhombic crystalline structure

B.C.C.

44 / 50

The refrigerant for a refrigerator should have ___________________?

low latent heat

high sensible heat

high latent heat

high total heat

45 / 50

The ideal efficiency of simple gas turbine cycle depends on________________?

pressure ratio

minimum cycle temperature

all of the above

maximum cycle temperature

46 / 50

Depending on the radiating properties, body will be transparent when________________?

p=l,x = 0,anda = 0

p = 0, x = 0 and a = 1

X = 0, a + p = 1

p = 0, T= l,anda = 0

47 / 50

Sulphur content of fuels is very important to the plant operators because it____________________?

has high heating value

retards electric precipitation

has highly corrosive effect

promotes complete combustion

48 / 50

In standard taper roller bearings, the angle of taper of outer raceway is___________________?

15?

25?

49 / 50

The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is__________________?

double

same

four times

half

50 / 50

The part load efficiency of a carburettor is,___________________?

Poor

Maximum

Optimum

Constant

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