Hydraulic And Pneumatic MCQ PDF

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9/20/2020

MCQ QUESTIONS Industrial Hydraulics & Pneumatics

TOUR2TECH

Topic: Introduction to Hydraulics & Pneumatics System 1. Hydraulic system includes ______

a.

Pump

b.

Filter

c.

Oil storage

d.

All of these

2. Which element is used for oil conditioning in hydraulic system? a. Pump

b.

Filters

c.

Heat exchangers

d.

(a) & (b)

3. Which element is responsible for the fluid control in the hydraulic system? a. Control valves

b.

Pump

c.

Heat exchangers

d.

None of these

4. Which element is used for storage of oil in any hydraulic system? a. Reservoir

b.

Filter

c.

Pump

d.

Heat exchangers

5. Which element is used for filter the oil before going to the next element in any hydraulic system? a) Filter

b)

Reservoir

c)

Pump

d)

Heat exchangers

6. ______ is called the heart of any hydraulic system. a. Pump

b.

Filter

c.

Heat exchangers

d.

Reservoir

7. When oil enters into the port in any hydraulic system, piston will move from_____

a.

Left to right

b.

Right to left

c.

Undefined direction

d.

None of these

8. What is used for controlling the pressure to increase beyond set value?

a.

Hydraulic pump

b.

Pressure relief valve

c.

Both can be used

d.

None of these

9. What is the maximum pressure (in bar), we can exhibit in any hydraulic system?

a.

700 bar pressure

b.

500 bar pressure

c.

800 bar pressure

d.

None of these

10. Why hydraulic motor is widely used in machine tools? a. Because it is cheap in price

b.

Because of its peculiar property

c.

Both a & b

d.

None of these

11. Special lubricating arrangements are required for hydraulic system?

a.

True

b.

False

12. The noise and vibration level produced by hydraulic system is very high.

a.

True

b.

False

13. Pneumatics is the technology deals with the _____

a.

Thermal energy

b.

Electrical energy

c.

Power of air

d.

None of these

14. Which tools operate on pneumatic power?

a.

Straight grinders

b.

Angle grinders

c.

Electrical heater

d.

Both a & b

15. What are the features of air?

a.

Air is absolutely fire proof

b.

Available free of cost

C. Construction of pneumatics equipment’s is comparatively easy. d. All of these 16. Pneumatics system includes components _____

a.

Air compressor

b.

Moisture separators

c.

Air filters

d.

All of these

17. ____ is used to increase the pressure of air in pneumatic system.

a.

Compressor

b.

Separators

c.

Air filters

d.

None of these

18. Which equipment is used to store the compressed air?

a.

Separators

b.

MS cylinders

c.

Valves

d. None of these 19. What is the full form of FRL?

a.

Filter Regulator Lubricator

b.

Fixed Regulation Lubricator

c.

Factual Rules Regulator

d.

None of these

20. Heavy lifting work is often accomplished by shifting fluids in big machines. The power system of such machines can be described as

a)

Reciprocating

b) Pneumatic c)

Hydraulic

d) Hybrid 21. Pneumatic and other power systems can support three kinds of motion; they are a) Linear, reciprocating, and random motion

b) Linear, flowing, and rotary motion

c)

Linear, zigzag, and spiral motion

d) Linear, reciprocating, and rotary motion 22. A single acting cylinder can be pressurized externally from one direction only. a) True b) False 23. A one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out, is a

a)

Check valve

b) Receiver valve c)

Control valve

d) Three way valve 24. 5/2 way single solenoid valve has: a) 2 ports 2 positions

b) 5 ports 2 positions c)

5 ports 5 positions

d) 2 ports 5 positions 25. When the piston area of the cylinder is connected to the atmosphere, the piston of the singleacting cylinder is pressed by the spring to the ________________ a) Cylinder center

b) Cylinder down c)

Cylinder bottom

d) Cylinder upper

26. Which machine is operated on hydraulic system?

a.

Pressure die casting machine

b.

Hydraulic shearing machine

c.

Hydraulic press brake

d.

All of these

27. _______ is a method of removal of metal by a tool.

a.

Polishing

b.

Broaching

c.

Reaming

d.

None of these

28. Applications of pneumatic systems are________

a.

Paper handling in offset printing press.

b.

Air brakes in heavy automobiles

c.

Pneumatic hammer for construction

d.

All of these

29. In which case, the torches needs frequent cleaning in pneumatic system?

a.

MIG welding

b.

TIG welding

c.

Both a & b

d.

None of these

30. Which machine is used to make a metal coat on components like turbine motors, marine engine pistons etc?

a.

MIG Welding

b.

Thermal spray coating

c.

By using a hydraulic fluid

d.

None of these

31. _______ is the medium by which power is transferred in hydraulic machines.

a)

MIG Welding

b)

Thermal spray coating

c)

By using a hydraulic fluid

d)

None of these

32. What are the properties of a Lubricant?

a.

Viscosity for film maintenance

b.

Low temperature fluidity

c.

Demulsibility

d.

All of these

33. ______ is an oils ability to release water.

a)

Viscosity for film maintenance

b)

Low temperature fluidity

c)

Demulsibility

d)

All of these

34. Why is it necessary for a good lubrication property?

a.

To increase the life of components

b.

To make the system cheap

c.

To make the system complex.

d.

None of these

35. Good hydraulic oil must be _____ to humans.

a.

Maximum toxic

b.

Minimum toxic

c.

Moderate toxic

d.

None of these

36. Good oil must have the property to obtain a good amount of foam.

a.

True

b.

False

37. For which property, we use petroleum based oils?

a.

Good lubricating property

b.

Good rust preventive

c.

Easy to keep clean

d.

All of these

e.

None of these

38. Petroleum based oils are non-flammable in nature.

a.

True

b.

False

39. At what maximum temperature, a synthetic hydraulic oil works?

a.

150 degree Celsius

b.

200 degree Celsius

c.

500 degree Celsius

d.

None of these

40. Pneumatic system can be used to _____

a.

50 bar

b.

700 bar

c.

10 bar

d.

None of these

41. Which system has the great motion accuracy/

a.

Hydraulic system

b.

Pneumatic system

c.

Both

d.

None of these

42. From which year, hydraulics system become use in human?

a.

1945

b.

1923

c.

1920

d.

1965

43. Fluid power circuits use schematic drawings to: a) Simplify component function details

b) Make it so only trained persons can understand the functions c)

Make the drawing look impressive

d) Make untrained person to understand 44. A pneumatic symbol is:

a)

Different from a hydraulic symbol used for the same function

b) The same as a hydraulic symbol used for the same function c)

Not to be compared to a hydraulic symbol used for the same function

d) None of the mentioned 45. Pneumatic systems usually do not exceed: a) 1 hp

b) 1 to 2 hp c)

2 to 3 hp

d) 4 to 5 hp 46. Most hydraulic circuits:

a)

Operate from a central hydraulic power unit

b) Use air-over-oil power units c)

Have a dedicated power unit

d) Does not have dedicated power unit

47. Hydraulic and pneumatic circuits:

a)

Perform the same way for all functions

b) Perform differently for all functions c)

Perform the same with some exceptions

d) Does not perform all the functions 48. The lubricator in a pneumatic circuit is the: a) First element in line

b) Second element in line c)

Last element in line

d) Third element in line 49. Series circuits work on both hydraulic and pneumatic actuators. a) True b) False 50. When comparing first cost of hydraulic systems to pneumatic systems, generally they are:

a)

More expensive to purchase

b) Less expensive to purchase c)

Cost is same

d) Cost is not required 51. When comparing operating cost of hydraulic systems to pneumatic systems, generally they are.

a)

More expensive to operate

b) Less expensive to operate c)

Cost is same to operate

d) Cost is not required

Topic: Pumps & Actuators 1. ____ is called the heart of a hydraulic system.

a.

Pump

b.

Filter

c.

Actuators

d.

None of these

2. The main function of a pump is ____

a.

Filtering the oil in the circuit.

b.

Putting the pressure up to 70bar

c.

Take the oil from the tank and deliver it to the rest of the circuit.

d.

None of these

5. Pump does not raise oil pressure in the tank.

a.

True

b.

False

6. In any system, if load is more, the pressure is less and vice-versa.

a.

True

b.

False

7. Which is the major category of a pump?

a.

Positive displacement pumps

b.

Non-positive displacement pumps (rotodynamic).

c.

Both a & b

d.

None of these

8. How much pressure is exhibit by a variable vane pump?

a.

400bar

b.

125bar

c.

34bar

d.

None of these

9. What happens when the resistance increases in any rotodynamic pump?

a.

Pressure increases

b.

Discharge reduces

c.

Discharge increases

d.

None of these

10. In which form the work is done in rotodynamic pump?

a.

Pressure energy

b.

Kinetic energy

c.

Thermal energy

d.

Wind energy

11. In which form the work is done in positive displacement pump?

a)

Pressure energy

b)

Kinetic energy

c)

Thermal energy

d)

Wind energy

12. Non-positive displacement pumps are used for low pressure work.

a.

True

b.

False

13. Do non-positive displacement pumps can create pressure above 40bar?

a.

Yes

b.

No

14. How many types of housing in the external gear pump?

a.

2

b.

4

c.

3

d.

1

15. External gears consists of ____

a.

Meshing gears

b.

Housing

c.

Cover plates

d.

All of these

16. External gear pump can create pressure up to _____

a.

300bar

b.

200bar

c.

212bar

d.

None of these

17. Internal gear pump can create pressure up to _____

a)

350bar

b)

200bar

c)

212bar

d)

None of these

18. In which type of pump, cresent is absent?

a.

External gear pump

b.

Internal gear pump

c.

Gerotor pump

d.

Vane type pump

19. On which principle the unbalanced vane pump works?

a.

Principle of kinetic law of machinery.

b.

Principle of increasing and diminishing volume.

c.

Newton law of motion

d.

None of these

20. What is the use of cam ring in unbalanced vane pump?

a.

To constrain the outward movements of vane.

b.

To decrease the speed of vane.

c.

To resist the pressure from the oil tank.

d.

None of these

21. Which type of cam ring is used in balanced vane pumps?

a.

Spherical cam ring

b.

Splash cam ring

c.

Roto cam ring

d.

Elliptical cam ring

22. From which component the oil enters in a balanced vane pump?

a.

Tank

b.

Filter

c.

Inlets

d.

None of these

23. The main function of centrifugal pumps are to ________ a) Transfer speed

b) Transfer pressure c)

Transfer temperature

d) Transfer energy 24. Which among the following control the flow rate? a) Valve

b) Pump c)

Head

d) Tank pipe

24. Turbines and compressors work with the gas, while centrifugal pump transfers energy. a) True b) False 25. The inlet passage of water entry is controlled by ________ a) Head race

b) Gate c)

Tail race

d) Pump 26. What is the use of sliding vanes in the pump?

a.

refining the oils

b.

creates space for pressure

c.

both a & b

d.

none of these

27. How much pressure, a screw pump can create?

a.

400bar

b.

300bar

c.

200bar

d.

100bar

28. Can screw pump run dry?

a)

Yes

b)

No

29. Screw pumps are _____

a.

Positive displacement pumps

b.

Non positive displacement pumps

c.

Intermediate pumps

d.

None of these

30. What is the usual speed of a screw pump?

a.

700 to 900 rpm

b.

1500 to 1700 rpm

c.

500 to 700 rpm

d.

None of these

31. Lobe pump is a high pressure pump.

a.

True

b.

False

32. When we should use lobe pump?

a.

When you require more quantity of oil at high pressure.

b.

When you require more quantity of oil at low pressure.

c.

When you require less quantity of oil at high pressure.

d.

None of these

33. Piston pumps are used when_____

a.

Pressure requirement is very high.

b.

Pressure requirement is very low.

c.

Pressure requirement is moderate.

d.

None of these

34. The fluid coming into the centrifugal pump is accelerated by ________ a) Throttle

b) Impeller c)

Nozzle

d) Governor 35. What are the criteria for selection of a pump?

a.

Pressure

b.

Flow of pressurized oil

c.

Speed of pump

d.

Efficiency of the pump

e.

All of these

36. What is the formula of volumetric efficiency of a pump?

a.

Actual discharge volume / theoretical discharge volume

b.

theoretical discharge volume / Actual discharge volume

c.

Actual discharge volume - theoretical discharge volume

d.

Actual discharge volume + theoretical discharge volume

37. _____ is used to convert the power of hydraulic pressurized oil into mechanical energy.

a.

Pumps

b.

Filters

c. Actuators d. None of thes

38. Which type of actuator is used to convert the fluid power into rotary mechanical energy?

a)

Hydraulic cylinders

b)

Hydraulic motors

c)

Limited rotary actuators

d)

None of these

39. Which one is the type of hydraulic cylinde...