MCQ
781. When the mach number is more than 6 the flow is called?
Subsonic flow
Supersonic flow
Sonic flow
Hypersonic flow
782. Define Viscosity.
Resistance to flow of an object
Resistance to flow of air
Resistance to flow of fluid
Resistance to flow of heat
783. Which property decides the behavior of fluid when mind with water?
pour point
viscosity
demursibuty
oxidation
784. The highest efficiency is abstained with channel of......section.
circular
trapezoidal
rectangular
triangular
785. A flow in which the equantity of liquid flowing per second is constant, is called ..... flow.
Steady
turbulent
streamline
unsteady
786. Viscosity of air-
decrease with increase of temperature
increase with increase of temperature
does not have any effect of temperature
depends on pressure
787. Water is a--fuid.
real
Newtonian
pressure
density
788. পিজোমিটার টিউব ক্যাবল নিম্নের কোনটি নির্ণয়ে ব্যবহৃত --
লো-প্রেসার
মডারেট প্রেসার
হাইপ্রেসার
ভ্যাকুয়াম প্রেসার
789. The viscosity of water is-than mercury.
more
slightly less
less
nearly equal
790. The power transmitted through the pipe is maximum when the head lost due to friction is equal to-
one-third of the total supply head
one-fourth of the total supply head
one-half of the total supply head
two-third of the total supply head
791. The mass per unit volume of a liquid ot a standard temperature and pressure is called-
specific weight
mass density
specific gravity
none
792. Anemometer is used to measure—
velocity
viscosity
pressure
density
793. Barometer is used to measure—
velocity of liquid
atmospheric pressure
pressure in pipes and channels
difference of pressure between two points in a pipe
794. In a steady flow process, the ratio of-
heat transfer is constant
work transfer is constant
mass flow at inlet and outlet is same
all of these
795. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid is called?
Surface tension
Capillarity
Compressibility
Viscosity
796. What is the instrument used for the automatic control scheme during the fluid flow?
Rotameters
Pulley plates
Rotary Piston
Pilot Static Tube
797. The frictional resistance of a pipe varies approximately with... of the liquid.
Pressure
velocity
square of velocity
cube
798. In industrial applications hydraulic fluids have viscosity grade ranging--
46 t0 68
70 to 95
15 to 44
none
799. What is the unit weight of water?
50 lb/ft^2
90.5 lb/ft^2
62.5 lb/ft^2
100 lb/ft^2
800. The kinenatic viscosity is the-
ratio of absolute viscosity to the density of the liquid
ratio of density of the liquid to the absolute viscosity
product of absolute viscosity and density of
product of absolute viscosity and mass of the the liquid