500 Best Hydraulics MCQ

Q129). The hydrostatic force acts through

a).centre of pressure
b).centre of top edge
c).centre of bottom edge
d).metacentre.

Correct Answer:
centre of pressure
Explanation:



Q130). In an inclined position, a venturimeter records

a).more reading
b).less reading
c).same reading
d).none of these.

Correct Answer:
same reading
Explanation:



Q131). In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to

a).diameter of the orifice
b).one-fourth the diameter of the orifice
c).one-third the diameter of the orifice
d).two-third the diameter of the orifice

Correct Answer:
one-fourth the diameter of the orifice
Explanation:



Q132). If the pressure at the inlet of a pipe is 90 kg/cm2 and pressure drop over the pipe line is 10 kg/cm2, the efficiency of transmission, is

a).0.666
b).0.777
c).0.555
d).88.8%.

Correct Answer:
88.8%.
Explanation:



Q133). Pick up the incorrect statement from to following regarding triangular notch :

a).For measuring low discharge, it gives more accurate result
b).Only one reading (i.e.H ) is required for computation of discharge
c).Ventilation is necessary
d).None of these.

Correct Answer:
Ventilation is necessary
Explanation:



Q134). The flow in a channel is said to be non-uniform, if

a).free water surface of an open channel is not parallel to the bed of channel
b).head needed to overcome frictional reistance is less than the drop in elevation of channel bed
c).head needed to overcome frictional resistance is more than the drop in elevation of channel bed
d).all the above.

Correct Answer:
all the above.
Explanation:



Q135). ‘Flow net’ can be drawn only if the flow is

a).turbulent
b).rotational
c).distortion
d).none of these.

Correct Answer:
distortion
Explanation:



Q136). The flow in open channel is laminar if the Reynold number is

a).less than 500
b).more than 500
c).1000
d).none of these.

Correct Answer:
less than 500
Explanation:



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