WorksheetsFlow & Flame Quiz Week II
Total questions: 20
Worksheet time: 15mins
Ratio of inertial force to surface tension force is called
Euler number
Weber number
Froude number
Reynolds number
The velocity distribution in a turbulent flow in a smooth pipe is
Parabolic Law
Linear Law
Exponential Law
Logarithmic Law
Continuity equation is based on the principle of:
Conservation of momentum
Conservation of mass
Conservation of energy
Conservation of vorticity
Boundary layer thickness decreases with:
Increase in Reynolds number
Decrease in Reynolds number
Constant Reynolds number
Increase in viscosity
The ratio of displacement thickness to momentum thickness is called:
Drag coefficient
Boundary layer parameter
Thickness ratio
Shape factor
Which of the following is true about stagnation pressure in compressible flow
It increases across a shock wave
It remains constant in all types of flow
It decreases across a normal shock
Independent of Mach number
Hydraulic jump occurs in
Laminar flow
Closed channel flow
Open channel flow
Compressible flow
Which type of similarity is not required in model similarity
Kinematic similarity
Geometric similarity
Dynamic similarity
Thermal similarity
The difference in pressure (in N/m2) across an air bubble of diameter 0.001 m immersed in water (surface tension = 0.072 N/m) is
(a)
Correct arrangement of hydraulic turbines in descending order of flow rate
Pelton Kaplan Francis
Pelton Francis Kaplan
Francis Kaplan Pelton
Kaplan Francis Pelton
In a psychrometric chart, one axis represents dry-bulb temperature. The axis, that is perpendicular to the dry-bulb temperature axis, represents
Wet bulb temperature
specific humidity
relative humidity
Enthalpy
The relation (Δt/Δp)h = 0 is true for
Ideal gas at any state
Real gas at any state
Any gas at its critical point
Any gas at its inversion point
A strip of thickness 40mm is to be rolled to a thickness of 20 mm using a two high mill having rolls of diameter 200 mm. Coefficient of friction and arc length in mm are
0.45 , 44.72
0.45 , 38.84
0.39 , 38.84
0.39 , 44.72
For an ideal Rankine cycle operating between pressure of 30 bar and 0.4 bar, the work output from the turbine is 903 kj/kg and the work input to the feed pump is 3 kj/kg. The specific steam consumption is (a) kg/kWh (round off to places)
Superheated steam at 1500 kPa has a specific volume of 2.75 m3/kmol and compressibility factor (Z) of 0.95. The temperature of steam is _______ °C
249
471
522
198
In modern CNC machines tools, the backlash has been eliminated by
slider crank
rack and pinion
ratchet and pinion
preloaded backscrews
In vapour compression refrigeration system, superheating of refrigerant vapour is done to:
Increase COP
Prevent liquid entry into compressor
Reduce compressor power
Cool condenser
The refrigerant R-717 is
Carbon dioxide
Sulphur dioxide
Freon 12
Ammonia
COP of a heat pump is
Less than 1
Greater than 1
Equal to 1
None of the above
In Bell Coleman cycle, compression and expansion processes are
Isothermal
Polytropic
Adiabatic
Isobaric
