Mechanical Engineering Quiz 16

1 / 50

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

total temperature drop in the stage

adiabatic temperature drop in the stage

total temperature drop

total adiabaitc temperature drop

2 / 50

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

1 ? 2%

2.5 to 4.5%

0.5 to 1%

5 ? 7%

3 / 50

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

packaged boiler does not exist

supplied mounted on a single base

purchased from several parties and packed together at site

supplied by same manufacturer loose and assembled at site

4 / 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

less

same

5 / 50

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

injector

governor

fuel pump

carburettor

6 / 50

Basic shaft is one__________________?

whose upper deviation is zero

whose lower deviation is zero

does not exist

whose lower as well as upper deviations are zero

7 / 50

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

absolute velocity

blade velocity

net head

flow

8 / 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

9 / 50

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

may start and end anywhere

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

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

10 / 50

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

lower/higher depending on weight of body

same

lower

higher

11 / 50

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

0.10%

0.00%

12 / 50

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

minute

hour

second

day

13 / 50

Absolute zero pressure will occur _____________________?

at sea level

under vacuum conditions

when molecular momentum of the system becomes zero

at the center of the earth

14 / 50

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

not affect the knocking tendency

decrease the knocking tendency

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

increase the knocking tendency

15 / 50

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

as square of density

directly as the air or gas density

inversely as square root of density

inversely as density

16 / 50

Gnatt chart provides information about the________________?

efficient working of machine

production schedule

material handling

proper utilisation of manpower

17 / 50

Cam size depends upon__________________?

pitch circle

base circle

outer circle

prime circle

18 / 50

The appellate authority for an industrial dispute is________________?

labour court

high court/supreme court

management

board of directors

19 / 50

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

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

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

20 / 50

Hardness of lower bainite (tempered martensite) is about________________?

RC 65

RC 80

RC 57

RC 48

21 / 50

Pick up the incorrect statement from the following ?

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

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

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

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

22 / 50

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

high heat value

low heat value

net calorific value

middle heat value

23 / 50

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

16 kg/cm2

25 kg/cm2

10 kg/cm2

6 kg/cm2

24 / 50

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

remain same

increase

unpredictable

decrease

25 / 50

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

higher

same

depends on on odier considerations

lower

26 / 50

Thermal conductivity of a material may be defined as the________________?

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

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

all of the above

27 / 50

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

work sampling

time study

work study

method study

28 / 50

Allen bolts are___________________?

used in aircraft application

designed for shock load

provided with hexagonal depression in head

self locking bolts

29 / 50

Maximum energy loss in a boiler occurs due to _______________________?

incomplete combustion

flue gases

unburnt carbon in ash

ash content

30 / 50

The allowed time for a job equals standard time plus___________________?

policy allowance

learning allowance

process allowance

interference allowance

31 / 50

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

functional organisation

effective organisation

line organisation

line and staff organisation

32 / 50

Creep in belt drive is due to____________________?

uneven extensions and contractions due to varying tension

material of the belt

material of the pulley

larger size of the driver pulley

33 / 50

Choose the wrong statement ?

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

All floating bodies are stable

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

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

34 / 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

35 / 50

Proof resilience per material is known as________________?

proof resilience

modulus of resilience

resilience

toughness

36 / 50

The efficiency of Carnot cycle is maximum for_____________________?

reversible engine

petrol engine

well lubricated engine

gas engine

37 / 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_________________?

maximum

infinity

minimum

zero

38 / 50

Surface tension__________________?

is a function of the curvature of the interface

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

decreases with fall in temperature

is also known as capillarity

39 / 50

The elastic stress strain behaviour of rubber is_____________________?

plastic

linear

no fixed relationship

non-linear

40 / 50

Addition of silicon to aluminium results in____________________?

improvement of corrosion resistance

one of the best known age and precipitation-hardening systems

improvement of casting characteristics

improving machinability

41 / 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

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

42 / 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

current value method

inflated system

primary cost method

43 / 50

Orsat meter is used for__________________?

volumetric analysis of the flue gases

measuring smoke density of flue gases

mass flow of the flue gases

gravimetric analysis of the flue gases

44 / 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 water

density of metal can?t be determined

metal will float in water

metal is twice as dense as unknown fluid

45 / 50

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

constant for all metals

the points where there is no further flow of metal

the points of discontinuity

the points where no further change oc-curs

46 / 50

Pick up wrong statement about wrought iron ?

It is very soft and ductile

It melts at 1535?C

It contains carbon of the order of 0 to 0.25%

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

47 / 50

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

atmospheric air

oxygen alone

vacuum

compressed air

48 / 50

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

kunckle joint

cotter joint

universal joint

bolted joint

49 / 50

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

liquid

gases

highly heated atmospheric air

solids

50 / 50

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

gasoline

diesel

fuel oil

kerosene

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