Question

Statement (I) : In a venturimeter, the divergent section is much longer as compared to the convergent section. 

Statement (II) : Flow separation occurs only in the diverging section of the venturimeter.

(a) Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) 

(b) Both statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) 

(c) Statement (I) is true but Statement (II) is false 

(d) Statement (I) is false but Statement (II) is true

Answer 1

(a) Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) 

In venturimeter divergent portion is much longer as compared to covergent section because in diverging section retardation of flow take place. If retardation of flow is allowed to take place rapidly in small length, then flowing fluid not remain in contact with boundary of diverging flow passage or in otherwords flow separates from the walls and eddies are formed. To avoid this divergent section of nozzle kept large.