Mechanical Engineering Quiz 16

1 / 50

The percentage of carbon in grey iron castings usually varies between __________________?

1 ? 2%

5 ? 7%

2.5 to 4.5%

0.5 to 1%

2 / 50

Thermal conductivity of a material may be defined as the________________?

all of the above

heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1?C

quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1?C

3 / 50

Which of the following is the lightest and most volatile liquid fuel________________?

diesel

kerosene

fuel oil

gasoline

4 / 50

Orsat meter is used for__________________?

measuring smoke density of flue gases

mass flow of the flue gases

gravimetric analysis of the flue gases

volumetric analysis of the flue gases

5 / 50

For the allotropic forms of iron, the points of arrest are __________________?

constant for all metals

the points where no further change oc-curs

the points where there is no further flow of metal

the points of discontinuity

6 / 50

In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?

middle heat value

net calorific value

high heat value

low heat value

7 / 50

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

less

more/less depending on compressor capacity

same

8 / 50

The appellate authority for an industrial dispute is________________?

high court/supreme court

management

board of directors

labour court

9 / 50

The efficiency of Carnot cycle is maximum for_____________________?

well lubricated engine

petrol engine

gas engine

reversible engine

10 / 50

If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be_________________?

infinity

minimum

maximum

zero

11 / 50

Maximum delivery pressure is a rotary air compressor is of the order of__________________?

16 kg/cm2

6 kg/cm2

10 kg/cm2

25 kg/cm2

12 / 50

Surface tension__________________?

is a function of the curvature of the interface

decreases with fall in temperature

is also known as capillarity

acts in the plane of the interface normal to any line in the surface

13 / 50

Pick up the incorrect statement from the following ?

The C.G. of a rectangle is at the inter-section of its diagonals

The C.G. of a semicircle is at a distance of r/2 from the center

The C.G. of a circle is at its center

The C.G. of a triangle is at the intersection of its medians

14 / 50

In a tensile test, near the elastic limit zone, the______________?

tensile strain increases more quickly

tensile strain decreases in proportion to the stress

tensile strain decreases more quickly

tensile strain increases in proportion to the stress

15 / 50

Cam size depends upon__________________?

base circle

pitch circle

outer circle

prime circle

16 / 50

The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight________________?

half the weight of bar applied at lower end

of same magnitude as that of bar and applied at the lower end

half of the square of weight of bar applied at lower end

one-fourth of weight of bar applied at lower end

17 / 50

In a typical medium speed, 4-stroke cycle diesel engine ___________________?

fuel injection starts at top dead center and ends at 20? after top dead center

fuelinjection starts at 10? before to dead center and ends at 20? after tor dead center

may start and end anywhere

fuel injection starts at just before top dead center and ends just after top deac center

18 / 50

The ash content in diesel oil should bot be more than_______________?

0.00%

0.10%

19 / 50

A streamline is defined as the line________________?

along which the pressure drop is uniform

parallel to central axis flow

parallel to outer surface of pipe

of equal yelocity in a flow

20 / 50

Creep in belt drive is due to____________________?

material of the belt

material of the pulley

uneven extensions and contractions due to varying tension

larger size of the driver pulley

21 / 50

A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?

purchased from several parties and packed together at site

packaged boiler does not exist

supplied mounted on a single base

supplied by same manufacturer loose and assembled at site

22 / 50

The piston rod of a steam engine is usually connected to the cross head by means of__________________?

bolted joint

cotter joint

universal joint

kunckle joint

23 / 50

The elastic stress strain behaviour of rubber is_____________________?

non-linear

linear

no fixed relationship

plastic

24 / 50

Mechanical efficiency of gas turbines as compared to I.C engines is____________________?

lower

same

higher

depends on on odier considerations

25 / 50

Proof resilience per material is known as________________?

resilience

modulus of resilience

toughness

proof resilience

26 / 50

The time oscillation of a floating body with increase in metacentric height will be_________________?

same

higher

lower/higher depending on weight of body

lower

27 / 50

If the intake air temperature of I.C engine increases, its efficiency will_________________?

remain same

decrease

unpredictable

increase

28 / 50

According to fan laws, at constant pressure, the speed capacity and power vary_________________?

directly as the air or gas density

as square of density

inversely as square root of density

inversely as density

29 / 50

Choose the wrong statement ?

The center of buoyancy is located at the center of gravity of the displaced liquid

For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

All floating bodies are stable

30 / 50

Any change in load is adjusted by adjusting following parameter on turbine______________?

net head

flow

blade velocity

absolute velocity

31 / 50

In air breathing jet engine, the jet is formed by expanding__________________?

gases

liquid

highly heated atmospheric air

solids

32 / 50

The wastage of material in the store is taken into account by the following method in the evaluation of the material issued from the store_______________?

fixed price method

inflated system

primary cost method

current value method

33 / 50

Allen bolts are___________________?

used in aircraft application

designed for shock load

self locking bolts

provided with hexagonal depression in head

34 / 50

In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?

not affect the knocking tendency

increase the knocking tendency

increase or decrease knocking tendency depending on strength and time of spark

decrease the knocking tendency

35 / 50

The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?

total adiabaitc temperature drop

total temperature drop

total temperature drop in the stage

adiabatic temperature drop in the stage

36 / 50

Hardness of lower bainite (tempered martensite) is about________________?

RC 57

RC 48

RC 65

RC 80

37 / 50

Addition of silicon to aluminium results in____________________?

improvement of corrosion resistance

improving machinability

one of the best known age and precipitation-hardening systems

improvement of casting characteristics

38 / 50

The allowed time for a job equals standard time plus___________________?

interference allowance

learning allowance

policy allowance

process allowance

39 / 50

Pick up wrong statement about wrought iron ?

It is made by adding suitable percent?age of carbon to molten iron and subjecting the product to repeated hammering and rolling

It contains carbon of the order of 0 to 0.25%

It melts at 1535?C

It is very soft and ductile

40 / 50

In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?

atmospheric air

vacuum

oxygen alone

compressed air

41 / 50

Basic motion time study gives times for basic motions in ten thousandths of_______________?

day

minute

hour

second

42 / 50

A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal_________________?

metal will float in water

metal is twice as dense as water

metal is twice as dense as unknown fluid

density of metal can?t be determined

43 / 50

Per cent idle time for men or machines is found by___________________?

work sampling

method study

time study

work study

44 / 50

The air-fuel ratio of the petrol engine is controlled by__________________?

injector

fuel pump

governor

carburettor

45 / 50

A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?

both may be put in any order

inferior insulation should be put over pipe and better one over it

better insulation should be put over pipe and better one over it

whether to put inferior OIL over pipe or the better one would depend on steam temperature

46 / 50

Absolute zero pressure will occur _____________________?

at sea level

when molecular momentum of the system becomes zero

under vacuum conditions

at the center of the earth

47 / 50

Gnatt chart provides information about the________________?

efficient working of machine

production schedule

material handling

proper utilisation of manpower

48 / 50

The most popular type of organisation used for Civil Engineering Constructions is_________________?

line and staff organisation

line organisation

functional organisation

effective organisation

49 / 50

Maximum energy loss in a boiler occurs due to _______________________?

flue gases

incomplete combustion

unburnt carbon in ash

ash content

50 / 50

Basic shaft is one__________________?

whose lower as well as upper deviations are zero

whose upper deviation is zero

does not exist

whose lower deviation is zero

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