Oil Hydraulics and Pneumatics (3151913) MCQs

MCQs of Hydraulic Oils, Fluid Properties and Filter

Showing 21 to 30 out of 43 Questions
1 2 3 4 5
21.

At which pressure, petroleum oil used in hydraulic systems gets compressed by 1/2%?

(a)

70 bar
(b)

40 bar
(c)

30 bar
(d)

95 bar
Answer:

Option (a)

22.

A fluid used in hydraulic systems should have_____.

(a)

Low oxidation resistance
(b)

High oxidation resistance
(c)

High oxidation enhancing the ability
(d)

All of the given
Answer:

Option (b)

23.

How is the water content in High Water Fluids (HFA) compared to oil content?

(a)

More oil than water
(b)

Oil and water are in the same proportion
(c)

More water than oil
(d)

Contains only water
Answer:

Option (c)

24.

What is the disadvantage of petroleum-based fluids?

(a)

Low flashpoint
(b)

Low density
(c)

Lightweight
(d)

None of the given
Answer:

Option (a)

25.

Which property decides the behavior of fluid when mixed with water?

(a)

Pour point
(b)

Demulsibility
(c)

Viscosity
(d)

Oxidation
Answer:

Option (b)

26.

The highest temperature at which a fluid in a hydraulic system flows is called its pour point.

(a)

True
(b)

False
Answer:

Option (b)

27.

What is the viscosity index?

(a)

Effect of pressure on changes in viscosity
(b)

Effect of temperature on changes in viscosity
(c)

Effect of resistance between two surfaces
(d)

None of the given
Answer:

Option (b)

28.

High viscosity fluids have_____.

(a)

Low-pressure drop
(b)

Less power consumption
(c)

slow operation
(d)

All of the given
Answer:

Option (c)

29.

In industrial applications, hydraulic fluids have viscosity grade ranging from________.

(a)

20-50
(b)

70-95
(c)

46-68
(d)

15-44
Answer:

Option (c)

30.

Volumetric efficiency is the ratio of_______.

(a)

Theoretical flow rate to actual flow rate
(b)

Actual flow rate to theoretical flow rate
(c)

Actual fluid power to pump input power
(d)

None of the given
Answer:

Option (b)

Showing 21 to 30 out of 43 Questions
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