C:-observation of the condition of dye -filament which become wavy or irregular at the onset
of the turbulence.

D:-measurement of intensity of turbulence
Correct Answer:- Option-C
Question68:-The laminar flow is characterized by:
A:-irregular motion of fluid particles
-fluid particles moving in layers parallel to the boundary layer
C:-high Reynolds number of flow
D:-existence of eddies
Correct Answer:- Option-B
Question69:-The parameters which determines the friction factor for turbulent flow in rough pipe are:
A:-Froude number and relative roughness
B:-Froude number and Mach number
C:-Reynolds number and relative roughness
D:-Mach number and relative roughness
Correct Answer:- Option-C
Question70:-In orifice flow, the vena contracta represents:
A:-the section where the jet has maximum flow area
B:-the location where the jet area is minimum , the streamlines parallel and the pressure atmospheric
C:-the section where the pressure is above atmospheric
D:-the opening of orifice itself
Correct Answer:- Option-B
Question71:-What is the major use of carbon molecular sieve?
A:-separation of lower hydro-carbons
-adsorption of organics from drinking water
C:-separation of air to produce nitrogen
D:-separation of suspended impurities from air
Correct Answer:- Option-C
Question72:-Rotameter is used for measuring:
A:-density of fluids
B:-velocity of fluids in pipes
C:-viscosity of fluids
D:-discharge of fluids
Correct Answer:- Option-D
Question73:-Joule-sec is the unit of
A:-thermal conductivity
nematic viscosity
C:-universal gas constant
D:-planck’s constant
Correct Answer:- Option-D
Question74:-Why are baffles provided in heat exchangers?
A:-To reduce heat transfer rate
B:-To increase heat transfer rate
C:-To remove dirt
D:-To reduce vibration
Correct Answer:- Option-B
Question75:-Kinetic energy of a gas molecule is zero at :
A:-0°c
B:-273°c
C:-100°c
D:--273°c
Correct Answer:- Option-D
Question76:-Cavitation will takes place in case of :
A:-pelton wheel
B:-rotary pump
C:-reciprocating pump
D:-centrifugal pump
Correct Answer:- Option-D
Question77:-Fog is formed due to: