Question: For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal__________________?

• 1. ratio of inertial force to force due to viscosity
• 2. ratio of inertial force to force due to gravitation
• 3. ratio of inertial force to force due to surface tension
• 4. all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

Question: Cavitation will begin when______________________?

• 1. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
• 2. pressure becomes more than critical pressure
• 3. flow is increased
• 4. pressure is increased

Question: Principle of similitude forms the basis of__________________?

• 1. comparing two identical equipments
• 2. designing models so that the result can be converted to prototypes
• 3. comparing similarity between design and actual equipment
• 4. hydraulic designs

Question: Cavitation is caused by___________________?

• 1. high velocity
• 2. high pressure
• 3. weak material
• 4. low pressure

Question: Bernoulli equation deals with the law of conservation of____________________?

• 1. mass
• 2. momentum
• 3. energy
• 4. work

Question: 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__________________?

• 1. 10 kg
• 2. 100 kg
• 3. 1000 kg
• 4. 1 kg

Question: For pipes, turbulent flow occurs when Reynolds number is_________________?

• 1. less than 2000
• 2. between 2000 and 4000
• 3. more than 4000
• 4. less than 4000

Question: The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to________________?

• 1. 1 Pa
• 2. 91Pa
• 3. 981 Pa
• 4. 9810 Pa

Question: In order that flow takes place between two points in a pipeline, the differential pressure between thes^ points must be more than_________________?

• 1. frictional force
• 2. viscosity
• 3. surface friction
• 4. all of the above

Question: A large Roynold number is indication of_________________?

• 1. smooth and streamline flow
• 2. laminar flow
• 3. steady flow
• 4. highly turbulent flow