151. In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
double
four times
eight times
sixteen times
✅ The correct answer is option A.
Hydraulics and Fluid Mechanics MCQs
152. A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
length of both the pipes is same
diameter of both the pipes is same
loss of head and discharge of both the pipes is same
loss of head and veloc
✅ The correct answer is option C.
153. The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.
equal
directly proportional
inversely proportional
✅ The correct answer is option B.
154. The liquid used in manometers should have
low density
high density
low surface tension
high surface tension
✅ The correct answer is option D.
155. When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.
Agree
Disagree
✅ The correct answer is option A.
156. The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
0.34 times
0.67 times
0.81 times
0.95 times
✅ The correct answer is option D.
157. The length of the divergent cone in a venturimeter is __________ that of the convergent cone.
equal to
double
three to four times
five to six times
✅ The correct answer is option C.
158. The unit of kinematic viscosity in S. I. units is
N-m/s
N-s/m2
m2/s
N-m
✅ The correct answer is option C.
159. A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity.
Agree
Disagree
✅ The correct answer is option A.
160. The flow in a pipe is turbulent when Reynold number is
less than 2000
between 2000 and 2800
more than 2800
none of these
✅ The correct answer is option C.