Question

Which of the following is NOT one of the four criteria by which the size of a hydraulic reservoir is determined?

1. It must make allowance for dirt and chips to settle and air to escape

2. Its inner surface must be covered with a layer of stainless still to avoid corrosion

3. It must maintain oil level high enough to prevent a whirlpool effect at the pump inlet

4. It must have a surface area large enough to dissipate heat

5. All of the above

Which of the following is the main advantage of the piston type accumulator over other gas type accumulators?

1. Its ability to handle very high or low temperature system fluids

2. Its small weight-to-volume ratio

3. A positive sealing between the gas and oil chambers

4. Its exclusive use of nitrogen

5. None of the above

Answer 1

Which one of the following is NOT criteria by which size of reservoir can be determined ?

Answer - B ) it's inner surface must be covered with layer of stainless steel to avoid corrosion

explanation-

The size of reservoir depend upon the following criteria -

1. It should make provision for contamination to settle down and air to escape.

2.The size must be large enough to hold all the oil comprising of oil in the circuit as well as back up reservoir necessary to compensate oil leakage losses.

3. It must give enough space above the oil level so that undissolved air get escape and cooling of heat oil takes places.

4. It should maintain enough oil level without any leakage in the reservoir.

​​​​​As in the hydraulic system oil is used as hydraulic fluid , there is no need to get reservoir coated with stainless steel as there are no chances of corrosion because oil itself act as lubricant.

which of the following is main advantage of piston type accumulator over other gas type accumulator ?

C. A positive sealing between the gas and oil chamber .

explanation-

piston type accumulator -

It consists of a cylinder body and a movable piston. Piston floats between gas and oil . This serves as a barrier between the gas and oil , avoids direct contact between two.