Question: According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?

• 1. directly as fan speed
• 2. square of fan speed
• 3. cube of fan speed
• 4. square root of fan speed

Question: According to fan laws, at constant pressure, the speed capacity and power vary_________________?

• 1. directly as the air or gas density
• 2. inversely as square root of density
• 3. inversely as density
• 4. as square of density

Question: Pressure intensifier increases the pressure in proportion to____________________?

• 1. ratio of diameters
• 2. square of ratio of diameters
• 3. inverse ratio of diameters
• 4. square of inverse ratio of diameters

Question: According to fan laws, for fans having constant wheel diameter, the pressure varies________________?

• 1. directly as fan speed
• 2. square of fan speed
• 3. cube of fan speed
• 4. square root of fan speed

Question: Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?

• 1. 39.2%
• 2. 49.2%
• 3. 68.8%
• 4. 84.8%

Question: According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies______________________?

• 1. directly as fan speed
• 2. square of fan speed
• 3. cube of fan speed
• 4. square root of fan speed

Question: Which place in hydraulic turbine is most susceptible for cavitation __________________?

• 1. inlet of draft rube
• 2. blade inlet
• 3. guide blade
• 4. penstock

Question: Specific speed for reaction turbines ranges from___________________?

• 1. 0 to 4.5
• 2. 10 to 100
• 3. 80 to 200
• 4. 250 to 300

Question: The discharge through a reaction turbine with increase in unit speed____________________?

• 1. increases
• 2. decreases
• 3. remains unaffected
• 4. first increases and then decreases

Question: Francis, Kaplan and propeller turbines fall under the category of___________________?

• 1. Impulse turbines
• 2. Reaction turbines
• 3. Axial flow turbines
• 4. Mixed flow turbines