হাইড্রোলিক্স এন্ড হাইড্রোলিক মেশিনারি MCQ
121. Reynold's number is the ratio the inertia force to the-
surcace tension force
viscous force
gravity force
elastic force
122. When the mach number is more than 6 the flow is called?
Subsonic flow
Supersonic flow
Sonic flow
Hypersonic flow
123. Which property decides the behavior of fluid when mind with water?
pour point
viscosity
demursibuty
oxidation
124. The ratio of specific weight of a liquid to the specific weight of pure water at standard temperature called-
density of liquid
specific gravity of liquid
compressibility of liquid
surface tamsion of liquid
125. Define Viscosity.
Resistance to flow of an object
Resistance to flow of air
Resistance to flow of fluid
Resistance to flow of heat
126. The atmospheric pressure at sea level is-
1.03 kg/cm²
760mm of mercury
10.3m of water
all of these
127. 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
128. Barometer is used to measure—
velocity of liquid
atmospheric pressure
pressure in pipes and channels
difference of pressure between two points in a pipe
129. 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
130. The frictional resistance of a pipe varies approximately with... of the liquid.
Pressure
velocity
square of velocity
cube
131. Law of intensity of pressure-
P=WH
P=mH
P=ωH
P=TH
132. The highest efficiency is abstained with channel of......section.
circular
trapezoidal
rectangular
triangular
133. Water is-Liquid.
a compressible
absolute pressure
an incompressible
None of these
134. What is the viscosity of water at 30°C?
80.1
0.801
801
0.081
135. What is the instrument used for the automatic control scheme during the fluid flow?
Rotameters
Pulley plates
Rotary Piston
Pilot Static Tube
136. In industrial applications hydraulic fluids have viscosity grade ranging--
46 t0 68
70 to 95
15 to 44
none
137. 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
138. Viscosity of air-
decrease with increase of temperature
increase with increase of temperature
does not have any effect of temperature
depends on pressure
139. The viscosity of water is-than mercury.
more
slightly less
less
nearly equal
140. 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