Mechanical Engineering Quiz 16

1 / 50

Cam size depends upon__________________?

outer circle

base circle

pitch circle

prime circle

2 / 50

Orsat meter is used for__________________?

mass flow of the flue gases

measuring smoke density of flue gases

gravimetric analysis of the flue gases

volumetric analysis of the flue gases

3 / 50

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

10 kg/cm2

25 kg/cm2

6 kg/cm2

16 kg/cm2

4 / 50

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

cotter joint

universal joint

bolted joint

kunckle joint

5 / 50

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

increase the knocking tendency

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

decrease the knocking tendency

not affect the knocking tendency

6 / 50

Absolute zero pressure will occur _____________________?

at sea level

when molecular momentum of the system becomes zero

at the center of the earth

under vacuum conditions

7 / 50

Basic shaft is one__________________?

does not exist

whose lower as well as upper deviations are zero

whose lower deviation is zero

whose upper deviation is zero

8 / 50

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

0.10%

0.00%

9 / 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

10 / 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

11 / 50

Creep in belt drive is due to____________________?

uneven extensions and contractions due to varying tension

larger size of the driver pulley

material of the belt

material of the pulley

12 / 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________________?

one-fourth of weight of bar applied at lower end

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

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

half the weight of bar applied at lower end

13 / 50

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

net head

blade velocity

flow

absolute velocity

14 / 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

may start and end anywhere

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

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

15 / 50

Addition of silicon to aluminium results in____________________?

improvement of corrosion resistance

improvement of casting characteristics

improving machinability

one of the best known age and precipitation-hardening systems

16 / 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_______________?

primary cost method

fixed price method

inflated system

current value method

17 / 50

The efficiency of Carnot cycle is maximum for_____________________?

reversible engine

well lubricated engine

petrol engine

gas engine

18 / 50

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

lower

higher

depends on on odier considerations

same

19 / 50

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

day

minute

hour

second

20 / 50

The elastic stress strain behaviour of rubber is_____________________?

no fixed relationship

non-linear

linear

plastic

21 / 50

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

low heat value

high heat value

net calorific value

middle heat value

22 / 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

supplied mounted on a single base

packaged boiler does not exist

supplied by same manufacturer loose and assembled at site

23 / 50

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

injector

fuel pump

governor

carburettor

24 / 50

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

gases

liquid

highly heated atmospheric air

solids

25 / 50

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

inversely as density

as square of density

inversely as square root of density

directly as the air or gas density

26 / 50

Hardness of lower bainite (tempered martensite) is about________________?

RC 80

RC 65

RC 57

RC 48

27 / 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

zero

minimum

maximum

28 / 50

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

unpredictable

decrease

increase

remain same

29 / 50

Gnatt chart provides information about the________________?

efficient working of machine

production schedule

material handling

proper utilisation of manpower

30 / 50

Choose the wrong statement ?

All floating bodies are stable

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

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

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

31 / 50

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

2.5 to 4.5%

1 ? 2%

5 ? 7%

0.5 to 1%

32 / 50

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

functional organisation

effective organisation

line organisation

line and staff organisation

33 / 50

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

fuel oil

kerosene

diesel

gasoline

34 / 50

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

oxygen alone

compressed air

vacuum

atmospheric air

35 / 50

Allen bolts are___________________?

designed for shock load

self locking bolts

used in aircraft application

provided with hexagonal depression in head

36 / 50

Pick up wrong statement about wrought iron ?

It melts at 1535?C

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 is very soft and ductile

37 / 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 in the stage

adiabatic temperature drop in the stage

total temperature drop

38 / 50

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

more/less depending on compressor capacity

same

less

39 / 50

Maximum energy loss in a boiler occurs due to _______________________?

ash content

flue gases

unburnt carbon in ash

incomplete combustion

40 / 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 is twice as dense as unknown fluid

metal will float in water

density of metal can?t be determined

metal is twice as dense as water

41 / 50

A streamline is defined as the line________________?

of equal yelocity in a flow

along which the pressure drop is uniform

parallel to outer surface of pipe

parallel to central axis flow

42 / 50

Surface tension__________________?

is also known as capillarity

decreases with fall in temperature

is a function of the curvature of the interface

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

43 / 50

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

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

both may be put in any order

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

44 / 50

Thermal conductivity of a material may be defined as the________________?

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

all of the above

45 / 50

The appellate authority for an industrial dispute is________________?

management

labour court

board of directors

high court/supreme court

46 / 50

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

work study

time study

method study

work sampling

47 / 50

The allowed time for a job equals standard time plus___________________?

policy allowance

learning allowance

interference allowance

process allowance

48 / 50

Proof resilience per material is known as________________?

toughness

resilience

modulus of resilience

proof resilience

49 / 50

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

the points of discontinuity

the points where no further change oc-curs

the points where there is no further flow of metal

constant for all metals

50 / 50

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

tensile strain decreases more quickly

tensile strain decreases in proportion to the stress

tensile strain increases in proportion to the stress

tensile strain increases more quickly

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