Hydrolic Mechines Engineering Quiz Questions

Hydrolic Mechines Online Quiz Test1

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1. Francis, Kaplan and propeller turbines fall under the category of _____.
Impulse turbines	Reaction turbines
Axial flow turbines	Mixed flow turbines

2. Reaction turbines are used for _____.
low head	high head
high head and low discharge	low head and high discharge

3. The discharge through a reaction turbine with increase in unit speed
increases	decreases
remains unaffected	first increases and then decreases

4. The angle of taper on draft tube is _____.
greater than 15°	greater than 8°
greater than 5°	less than 8°

5. Specific speed for reaction turbines ranges from _____.
0 to 4.5	10 to 100
80 to 200	250 to 300

6. In axial flow fans and turbines, fluid enters and leaves as follows _____.
radially, axially	axially, radially
axially, axially	radially, radially

7. Which place in hydraulic turbine is most susceptible for cavitation
inlet of draft rube	blade inlet
guide blade	penstock

8. Air vessels in reciprocating pump are used to ____.
smoothen flow	reduce acceleration to minimum
increase pump efficiency	save pump from cavitation

9. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of ____.
39.2%	49.2%
68.8%	84.8%

10. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of ____.
39.2%	49.2%
68.8%	84.8%

11. According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies ____.
directly as fan speed	square of fan speed
cube of fan speed	square root of fan speed

12. According to fan laws, for fans having constant wheel diameter, the pressure varies
directly as fan speed	square of fan speed
cube of fan speed	square root of fan speed

13. According to fan laws, for the fans having constant wheel diameters, the power demand varies
directly as fan speed	square of fan speed
cube of fan speed	square root of fan speed

14. According to fan laws, at constant speed and capacity, the pressure and power vary
directly as the air or gas density	inversely as square root of density
inversely as density	as square of density

15. According to fan laws, at constant pressure, the speed capacity and power vary
directly as the air or gas density	inversely as square root of density
inversely as density	as square of density

16. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary ____.
directly as the air or gas density	inversely as square root of density
inversely as density	as square of density

17. Pressure intensifier increases the pressure in proportion to _____.
ratio of diameters	square of ratio of diameters
inverse ratio of diameters	square of inverse ratio of diameters

18. A hydraulic accumulator normally consists of _____.
two cylinders, two rams and a storage device	a cylinder and a ram
two co-axial rams and two cylinders	a cylinder, a piston, storage tank and control valve

19. A hydraulic intensifier normally consists of
two cylinders, two rams and a storage device	a cylinder and a ram
two co-axial rams and two cylinders	a cylinder, a piston, storage tank and control valve

20. Hydraulic accumulator is used for _____.
accumulating oil	supplying large quantities of oil for very short duration
generally high pressures to operate hydraulic machines	supplying energy when main supply fails

Hydrolic Mechines Online Quiz Test2