Oil Hydraulics and Pneumatics (3151913) MCQs

MCQs of Hydraulic Oils, Fluid Properties and Filter

Showing 11 to 20 out of 43 Questions
1 2 3 4 5
11.

The Reynolds number for laminar flow is

(a)

More than 2800
(b)

More than 2000
(c)

Less than 2000
(d)

Between 2000 and 2800
Answer:

Option (c)

12.

If a pump gives a higher flow rate to the valve then, the pressure drop in the valve

(a)

Increases
(b)

Decreases
(c)

Remains the same
(d)

None of the above
Answer:

Option (a)

13.

The total energy developed by the hydraulic oil in a system is given as

(a)

Total energy = (Potential energy – Kinetic energy)
(b)

Total energy = (Potential energy + Pressure energy)
(c)

Total energy = (Potential energy + Kinetic energy)
(d)

none of the given
Answer:

Option (c)

14.

Which flow pattern gets affected when the cross-section of the pipe is changed?

(a)

Laminar flow
(b)

Turbulent flow
(c)

Laminar and Turbulent
(d)

None of the given
Answer:

Option (b)

15.

What is the characteristic of turbulent flow?

(a)

High velocity
(b)

The direction of flow and movement of particles is the same
(c)

Change in cross-section does not affect the flow
(d)

All of the given
Answer:

Option (a)

16.

Adding an additive to water-glycol fluids improves

(a)

Flammability
(b)

Viscosity
(c)

Oxidation
(d)

All of the given
Answer:

Option (b)

17.

High Water Fluids contain_______.

(a)

Oil in water
(b)

Water in oil
(c)

Only water
(d)

None of the given
Answer:

Option (a)

18.

Match the following group 1 with group 2 and select the correct option:

Group 1 ---------------------------------------- Group 2

1. High water fluids ---------------------------- A. Water and synthetic chemical

2. Water in oil ---------------------------------- B. Fire-resistant fluid

3. Water glycol --------------------------------- C. Oil in water

4. Synthetics ------------------------------------ D. Tiny droplets of water in oil

(a)

C-D-A-B
(b)

D-C-B-A
(c)

C-B-D-A
(d)

D-C-A-B
Answer:

Option (a)

19.

What is the relation between temperature and viscosity for hydraulic oil?

(a)

Temperature and viscosity vary linearly
(b)

As temperature decreases viscosity decreases at atmospheric pressure
(c)

As temperature increases viscosity decreases at atmospheric pressure
(d)

None of the given
Answer:

Option (c)

20.

What is the relation between temperature and specific weight for water glycol?

(a)

As the temperature increases specific weight decreases
(b)

As the temperature increases specific weight increases
(c)

Temperature and specific weight vary linearly
(d)

None of the given
Answer:

Option (a)

Showing 11 to 20 out of 43 Questions
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