171. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc__________________?
A. 10 kg
B. 100 kg
C. 1000 kg
D. 1 kg
E. 10,000 kg

172. For pipes, turbulent flow occurs when Reynolds number is_________________?
A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
E. none of the above

173. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to________________?
A. 1 Pa
B. 91Pa
C. 981 Pa
D. 9810 Pa
E. 98,100 Pa

174. In order that flow takes place between two points in a pipeline, the differential pressure between thes^ points must be more than_________________?
A. frictional force
B. viscosity
C. surface friction
D. all of the above
E. none of the above

175. A large Roynold number is indication of_________________?
A. smooth and streamline flow
B. laminar flow
C. steady flow
D. turbulent flow
E. highly turbulent flow

176. Reynolds number is significant in____________________?
A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
E. none of the above

177. Froude number is significant in____________________?
A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
E. none of the above

178. The equation of continuity holds good when the flow __________________?
A. is steady
B. is one dimensional
C. velocity is uniform at all the cross sec-tions
D. all of the above
E. none of the above

179. Cavitation will begin when______________________?
A. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
B. pressure becomes more than critical pressure
C. flow is increased
D. pressure is increased
E. none of the above

180. Principle of similitude forms the basis of__________________?
A. comparing two identical equipments
B. designing models so that the result can be converted to prototypes
C. comparing similarity between design and actual equipment
D. hydraulic designs
E. performing acceptance tests

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