Mechanical Engineering Quiz 23

1 / 50

A bolt___________________?

has both the ends threaded

has head at one end and other end fits into a tapped hole in the other part to be joined

is provided with pointed threads

has a head on one end and a nut fitted to the other

2 / 50

Metacentric height is the distance between the metacentre and_______________?

center of buoyancy

center of gravity

water surface

center of pressure

3 / 50

Father of time study was_________________?

F.W. Taylor

H.L. Gantt

F. Gilberfh

R.M. Barnes

4 / 50

For simple harmonic motion of the of follower, a cosine curve represents___________________?

displacement diagram

all of the above

velocity diagram

acceleration diagram

5 / 50

The ratio of isentropic work to euler?s work is known as _____________________?

compressor efficiency

Euler?s efficiency

pressure coefficient

isentropic efficiency

6 / 50

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?

remain same

decrease

unpredictable

increase

7 / 50

During the opening of a valve in a pipe line, the flow is_________________?

unsteady

laminar

uniform

steady

8 / 50

Which of the following gases has the highest calorific value ________________?

water gas

coal gas

producer gas

blast furnace gas

9 / 50

Emergency rush order can be pushed more effectively in__________________?

continuous production

intermittent production

job production

automatic production

10 / 50

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will_________________?

decrease

increase/decrease depending on depth of immersion

increase

remain same

11 / 50

Boiling water reactor uses the following as moderator, coolant and working fluid________________?

hydrogen gas

ordinary fluid

heavy water

molten lead

12 / 50

As the number of cylinders in multi-cylinder engine increases, the power to weight ratio_______________?

Increases

Decreases upto a limit and then increases

Remains same

Decreases

13 / 50

On Millier chart, the constant pressure lines_________________?

diverge from right to left

diverge from left to right

first rise up and then fall

are equally spaced throughout

14 / 50

Ductile cast iron___________________?

is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

is produced by annealing process. It is soft, tough and easily machined metal

is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

15 / 50

The example of spherical pair is_____________________?

bolt and nut

lead screw of a lathe

ball bearing and roller bearing

ball and socket joint

16 / 50

The important file in making a PERT is__________________?

length of arrow has nothing to do with time

an event can?t be accomplished until activities leading to it are completed

all of the above

no activity from any event can be started from preceding event till it is completed

17 / 50

Critical path moves along the activities having total float of_____________________?

positive value

negative value

same value

zero value

18 / 50

Gradually varied flow is__________________?

steady uniform

steady non-uniform

non-steady non-uniform

non-steady uniform

19 / 50

If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?

decrease with decrease in y

be independent of ratio of mass of load W to mass of bar (y)

increase with increase in y

depend on other considerations

20 / 50

In the breeder reactors the generation of new fissionable atom is_________________?

at the lower rate than the consumption

at an equal rate of the consumption

depends on other considerations

at a higher rate than the constuption

21 / 50

In triggering fission, the following types of neutrons are desirable_________________?

slow moving

fast moving

neutrons at rest

critical neutrons

22 / 50

The unit of Stefan Boltzmann constant is ____________________?

watt/cm2 ?K

watt/cm2 ?K4

watt/cm4 ?K

watt2/cm ?K4

23 / 50

The moisture in a refrigerant is removed by___________________?

dehumidifier

safety relief valve

driers

evaporator

24 / 50

Rectangular bar in a rectangular hole is the following type of pair__________________?

incompletely constrained motion

completely constrained motion

freely constrained motion

partially constrained motion

25 / 50

A foot step bearing and rotor of a vertical turbine form examples of___________________?

incompletely constrained motion

completely constrained motion

successfully constrained motion

partially constrained motion

26 / 50

Pick up the wrong statement about advantages of multistage compression____________________?

better lubrication is possible advantages of multistage

more loss of air due to leakage past the cylinder

mechanical balance is better

air can be cooled perfectly in between

27 / 50

High air-fuel ratio is used in gas turbines______________________?

to reduce the exit temperature

to save fuel

to increase the efficiency

to increase the output

28 / 50

The specific fuel consumption per BHP hour for diesel engine is approximately___________________?

0.2 kg

0.15 kg

0.3 kg

0.25 kg

29 / 50

The distance between the centres of the rivets in adjacent rows of zig-zag riveted joint is known as ____________________?

diagonal pitch

back pitch

pitch

diametral pitch

30 / 50

Process layout is employed for_________________?

continuous type of product

batch production

effective utilisation of machines

all of the above

31 / 50

An engineer?s hammer is made of___________________?

cast iron

high carbon steel

forged steel

mild steel

32 / 50

Pick up the wrong statement about supercharging __________________?

supercharging at high altitudes is essential

supercharging reduces knocking in diesel engines

supercharging results in fuel economy

there can be limited supercharging in petrol engines because of detonation

33 / 50

If a part is constrained to move and heated, it will develop ____________________?

principal stress

compressive stress

shear stress

tensile stress

34 / 50

The COP of a domestic refrigerator___________________?

is equal to 1

depends upon the make

is less than 1

is more than 1

35 / 50

Froude number is significant in__________________?

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship?s hulls

full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

all of the above

supersonics, as with projectile and jet propulsion

36 / 50

An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ?g? at this place is _________________?

10.2/m sec

9.75 m/sec2

10m/sec2

9.81 m/sec2

37 / 50

Center of buoyancy is the___________________?

does not exist

centroid of the displaced volume of fluid

center of pressure of displaced volume

e.g. of floating ?body

38 / 50

Thermal diffusivity of a substance is ____________________?

inversely proportional to k

proportional to (k)

proportional of thermal conductivity

inversely proportional to k2

39 / 50

Lancashire ?boiler is a__________________?

stationary fire tube boiler

stationary water tube boiler

mobile fire tube boiler

water tube boiler with natural/forced circulation

40 / 50

Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?

remains constant

decreases

may increase or decrease depending on temperature

increases

41 / 50

Clapeyron equation is a relation between___________________?

temperature, pressure and enthalpy

specific volume and enthalpy

temperature, pressure, specific volur and?enthalpy

temperature and enthalpy

42 / 50

DuraJomin contains___________________?

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg

10% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

43 / 50

The delay period in petrol engine is of the order of__________________?

0.001 sec

0.01 sec

0.05 sec

0.002 see

44 / 50

The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is_________________?

smaller/bigger depending on capacity

equal

bigger

smaller

45 / 50

The shrinkage allowance for cast iron pattern is________________?

10 mm/m

15 mm/m

20 mm/m

26 mm/m

46 / 50

The operation of forcing additional air under pressure in the engine cylinder is known as________________?

supercharging

scavenging

pre-ignition

turbulence

47 / 50

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?

50:50:00

40 : 60

30 : 70

70:30:00

48 / 50

Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?

viscosity

compressibility

adhesion

cohesion

49 / 50

Water boils when its vapour pressure ___________________?

equals to atmospheric pressure

equals that of the surroundings

equals 760 mm of mercury

equals the pressure of water in the container

50 / 50

To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is____________________?

multiplied by its specific weight

divided by its molecular weight

multiplied by its molecular weight

multiplied by its density

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