Q1. According to fan laws, for the fans having constant wheel diameters, the power demand varies
(A) directly as fan speed
(B) square of fan speed
(C) cube of fan speed
(D) square root of fan speed

Q2. According to fan laws, for fans having constant wheel diameter, the pressure varies
(A) directly as fan speed
(B) square of fan speed
(C) cube of fan speed
(D) square root of fan speed

Q3. According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies
(A) directly as fan speed
(B) square of fan speed
(C) cube of fan speed
(D) square root of fan speed

Q4. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of
(A) 0.392
(B) 0.492
(C) 0.698
(D) 0.868

Q5. of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of
(A) 0.392
(B) 0.492
(C) 0.688
(D) 0.848

Q6. Air vessels in reciprocating pump are used to
(A) smoothen flow
(B) reduce acceleration to minimum
(C) increase pump efficiency
(D) save pump from cavitation

Q7. Which place in hydraulic turbine is most susceptible for cavitation
(A) inlet of draft rube
(B) blade inlet
(C) guide blade
(D) penstock

Q8. In axial flow fans and turbines, fluid enters and leaves as follows
(A) radially, axially
(B) axially, radially
(C) axially, axially
(D) radially, radially

Q9. Specific speed for reaction turbines ranges from
(A) 0 to 4.5
(B) 10 to 100
(C) 80 to 200
(D) 250 to 300

Q10. The angle of taper on draft tube is
(A) greater than 15°
(B) greater than 18°
(C) greater than 5°
(D) less than 8°

Q11. The discharge through a reaction turbine with increase in unit speed
(A) increases
(B) decreases
(C) remains unaffected
(D) first increases and then decreases

Q12. Reaction turbines are used for
(A) high head
(B) high head and low discharge
(C) high head and high discharge
(D) low head and high discharge

Q13. Francis, Kaplan and propeller turbines fall under the category of
(A) Impulse turbines
(B) Reaction turbines
(C) Axial flow turbines
(D) Mixed flow turbines

Q14. Impulse turbine is generally fitted
(A) at the level of tail race
(B) little above the tail race
(C) slightly below the tail race
(D) about 5 m above the tail race to avoid cavitation

Q15. The flow rate in gear pump
(A) increases with increase in pressure
(B) decreases with increase in pressure
(C) more or less remains constant with in-crease in pressure
(D) unpredictable

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