Hydraulic System and Components - 3 - MCQs and Answers

Hydraulic System and Components – 3 – MCQs and Answers

1. How is the smooth and continuous discharge of fluid achieved in a gear pump?

a. increasing number of teeth
b. decreasing number of teeth
c. none of the above

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2. What cause discharge of fluid in an external gear pump?

1. the electric motor drives one gear which turns the other gear
2. the electric motor drives both the gears simultaneously
3. fluid passes between the gears to discharge side
4. fluid passes through interior of the casing between teeth and casing and not between the gears

a. 1 and 3
b. 2 and 3
c. 1 and 4
d. 2 and 4

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3. The rotation of gears in internal gear pump takes place in

a. same direction
b. different direction
c. none of the above

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4. How does the fluid flow in internal gear pump?

a. fluid enters the suction side between rotor, which is a large exterior gear and idler which is a small interior gear
b. fluid enters the suction side between rotor, which is a small exterior gear and idler which is a large interior gear
c. fluid enters the suction side between rotor and idler which rotate in different directions
d. none of the above

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5. What causes internal leakage in internal gear pump?

a. less tolerance level between the meshing surfaces
b. more tolerance level between the meshing surfaces
c. no tolerance between the meshing surfaces
d. none of the above

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6. What is the relation between pressure and overall efficiency for a gear pump?

a. as pressure increases, overall efficiency decreases
b. as pressure increases, overall efficiency increases
c. overall efficiency is not affected by change in pressure
d. none of the above

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7.What is the advantage of internal gear pump?

a. moderate speed
b. medium pressure
c. high viscosity fluids can be used
d. all the above

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8. In centrifugal pumps, the rotation of which inner element causes the liquid to pump out?

a. internal gear
b. rotation of the impeller
c. cylinder rotor
d. none of the above

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9. Which force causes vanes to come out of the rotor slots?

a. centripetal force
b. centrifugal force
c. friction force
d. none of the above

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10. Which of the following statements is true?

a. combination of stator with rotor is known as cartridge unit
b. combination of stator with vanes is known as cartridge unit
c. combination of rotor with vanes is known as cartridge unit
d. none of the above

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