ME8694 HP MCQ 1

Motors used in high speed applications have

• high torque with high speed

• low torque with high speed

• high torque with low speed

• none of the above

Which fluid is used in hydraulic power systems?

• a. water

• b. oil

• c. non-compressible fluid

• d. all of the above

Pressure of 1 bar is equal to

• a. 14.5 psi

• b. 145 psi

• c. 12.5 psi

• d. 145 x 10^-6 psi

Why is fluid power preferred in mobile vehicles?

1. Power can be transmitted without any delay

2. When overloaded, fluid power systems stop without damaging the components

3. Speed variation cannot be achieved

4. Fluid is non-compressible

• a. 1 and 4

• b. 2, 3 and 4

• c. 1, 2 and 4

• d. 1 and 2

What effect does overloading have on fluid power and electrical systems?

• a. electrical components get damaged in electrical systems

• b. fluid power system stops working without damaging the components

• c. both a. and b.

• d. none of the above

How is power transmitted in fluid power systems?

• a. power is transmitted instantaneously

• b. power is transmitted gradually

• c. both a. and b.

• d. none of the above

Generally liquids are non-compressible but when a large pressure of 70 bar is applied, petroleum oil can be compressed up to

• a. 0.5% of its original volume

• b. 1% of its original volume

• c. 5% of its original volume

• d. none of the above

Can all hydraulic fluids be compressed when extremely large pressure is applied?

• a. Yes

• b. No

The resistance offered to the flow of fluid inside a piston develops into

• a. pressure

• b. force

• c. stress

• d. all of the above

At low pressures, liquids are

• a. compressible

• b. non-compressible

• c. unpredictable