Mechanical Engineering Quiz 7

1 / 50

The fatigue limit of a material____________________?

remains same irrespective of surface conditions

depends mainly on core composition

is dependent upon yield strength of material

is greatly decreased by poor surface conditions

2 / 50

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

increases markedly

remains same

decreases markedly

depends on heat treatment carried out

3 / 50

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

straight line

parabola

circle

ellipse

4 / 50

In open combustion chamber in diesel engines____________________?

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

fuel is injected at atmospheric pres?sure

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

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

5 / 50

The part load efficiency of a carburettor is,___________________?

Constant

Maximum

Poor

Optimum

6 / 50

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

at distance ? from the plane base or

at distance ? from the plane base 3r

7 / 50

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

same

twice

eight times

four times

8 / 50

The first method invented for planning projects was________________?

milestone chart

critical path method (CPM)

programme evaluation and review technique (PERT)

bar chart method

9 / 50

In nodular iron, graphite is in the form of_____________________?

free carbon

spheroids

cementite

flakes

10 / 50

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

has high heating value

has highly corrosive effect

promotes complete combustion

retards electric precipitation

11 / 50

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

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

different at different points in its line of action

the same at every point in its line of action

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

12 / 50

Basic solution is one which has pH value___________________?

greater than 7

less than 7

pH value has nothing to do with basic solution

equal to 7

13 / 50

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

couple

coplanar force

lever

non-coplanar forces

14 / 50

The crystal structure of brass is_________________?

B.C.C.

Orthorhombic crystalline structure

H.C.P.

F.C.C.

15 / 50

In an isothermal process, the internal energy________________?

remains constant

increases

decreases

first increases and then decreases

16 / 50

The ideal efficiency of simple gas turbine cycle depends on________________?

pressure ratio

all of the above

minimum cycle temperature

maximum cycle temperature

17 / 50

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

heat transfer area should be optimum

handling and maintenance should be easier

stack gases should not be cooled to the dew point

approach temperature should be as low as possible

18 / 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__________________?

four times

double

half

same

19 / 50

Belt slip may occur due to________________?

driving pulley too small

loose belt

all of the above

heavy load

20 / 50

Which of the following is not the unit of power ?

kcal/sec

kW (kilowatt)

kcal/kg sec

hp (horse power)

21 / 50

In accelerated circulation type boiler________________?

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

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

None

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

22 / 50

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

event flow scheduling technique

slotting technique for scheduling

critical ratio scheduling

short interval scheduling

23 / 50

Boiler H.P. is defined as the ________________ ?

steam evaporation rate per kg of fuel fired

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

work done by 1 kg of steam at saturation condition

24 / 50

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

improved scavenging

heavy supercharging

detonation

heavy turbulence

25 / 50

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

eats up neutrons

accelerates neutrons

absorbs neutrons

does not absorb neutrons

26 / 50

An ideal flow of any fluid must fulfill the following____________________?

Pascal? law

Newton?s law of motion

Continuity equation

Newton?s law of viscosity

27 / 50

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

during which the follower returns to its initial position

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

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

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

28 / 50

Vertical lines on pressure-enthalpy chart show constant_______________?

total heat lines

temperature lines

entropy lines

pressure lines

29 / 50

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

are equivalent

produce moment of a couple

balance each other

cannot balance each other

30 / 50

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

0.01 micron

10 microns

1 micron

0.1 micron

31 / 50

The term ?value? in value engineering refers to_______________?

utility of the product

manufactured cost of the product

total cost of the product

selling price of the product

32 / 50

Rotary compressor is best suited for_____________________?

small quantity of air at high pressure

large quantity of air at high pressure

small quantity of air at low pressure

large quantity of air at low pressure

33 / 50

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

same

more or less depending on other factors

less

34 / 50

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

osmosis

cohesion

surface tension

viscosity

35 / 50

The refrigerant for a refrigerator should have ___________________?

high latent heat

high total heat

low latent heat

high sensible heat

36 / 50

Plutonium is produced________________?

by neutron irradiation of Uz

by neutron irradiation of throium

as basic raw material

artificially

37 / 50

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

15?

25?

38 / 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 ___________________?

conduction

convection

radiation

conduction and convection

39 / 50

The intensity of stress which causes unit strain is called_______________?

bulk modulus

unit stress

modulus of elasticity

modulus of rigidity

40 / 50

The following is the inversion of slider crank chain mechanism______________________?

Whitworth quick return mechanism

oscillating cylinder engine

hand pump

all of the above

41 / 50

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

1.75 to 2.75 m

1 tp 1.25m

1 to 1.75 m

2 to 4 m

42 / 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________________?

4-Aug

2-Aug

43 / 50

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

X = 0, a + p = 1

p=l,x = 0,anda = 0

p = 0, x = 0 and a = 1

p = 0, T= l,anda = 0

44 / 50

Turbofan engine employs ____________________ ?

two or more air streams

no air stream

one air stream

solid fuel firing

45 / 50

Form coefficient of spring is _____________________?

load required to produce unit deflection

its capability of storing energy

ratio of coil diameter to wire diameter

concerned With strength of wire of spring

46 / 50

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

500- 1000?C

2000-2500?C

1000- 1500?C

1500-2000?C

47 / 50

Austenite rs a combination of_________________?

cementite and gamma iron

ferrite and cementite

ferrite and austenite

ferrite and iron graphite

48 / 50

Standard time as compared to normal time is_______________?

smaller

equal

greater

there is no such correlation

49 / 50

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

3, 1

4, 0

I, 3

2, 2

50 / 50

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

None

between the pistons

above the piston (/;) below the piston

any when

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