# Mechatronics Questions and Answers – Fluid Power Systems – 1

This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on “Fluid Power Systems – 1 ”.

1. Which type of system uses ‘oil under pressure’ means for power transmission?
a) Fluid power system
b) Hydraulic system
c) Pneumatic system
d) Stepper motors

Explanation: Fluid Power system is a power transmission system in which, the transmission of power takes place by means of “oil under pressure” or “compressed air”. If “oil under pressure” is used in the system for power transmission then the system is called as hydraulic system. If “compressed air” is used in the system for power transmission then the system is called as pneumatic system.

2. The force developed in hydraulic systems is high due to ____
a) high pressure
b) more oil
c) less pressure
d) less oil

Explanation: As oil is incompressible, oil can be pressurized to very high pressure (500 tons or more). Since pressure is high, the force developed is also very high (thousands of tons). Since pressure is high, components are very strong, made of steel and are heavy.

3. Hydraulic systems are slower in operation.
a) True
b) False

Explanation: As oil has more viscosity, it cannot flow fast. Hence Hydraulic systems are slower in operation. Hydraulic oils are petroleum-based oils, they are inflammable and there is every chance of fire hazard if this is neglected.

4. Which component of a hydraulic system is used to store a sufficient amount of hydraulic oil?
a) Rotatory pumps
b) Oil reservoir
c) Flow control valve
d) Pressure gauge

Explanation: The main function of an oil reservoir is to store a sufficient amount of hydraulic oil in the system. Apart from this, it has many other functions such as to cool the hot return oil, to settle down the contaminants, to remove air bubbles and to separate water from the oil. The other options mentioned are the parts of the hydraulic system with different functions.

5. What pumps hydraulic oil to the hydraulic circuit?
a) Flow control valve
b) Oil reservoir
c) Rotatory pumps
d) Pressure gauge

Explanation: The function of the rotatory pump is to pump hydraulic oil to the hydraulic circuit. It converts mechanical energy to hydraulic energy. The flow control valves, oil reservoir and pressure gauge are the other parts of the hydraulic system with different functions.
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6. The pressure relief valve is an important component which is required for every displacement pump.
a) True
b) False

Explanation: Pressure relief valve is an important component which is required for every positive displacement pump. This valve is connected to the outlet of the pump. Its main function is to release the oil back to the tank when the pressure increases beyond pre-set value.

7. In which type of system does power transmission takes place through compressed air?
a) Fluid power system
b) Hydraulic system
c) Pneumatic system
d) Stepper motors

Explanation: Pneumatic system is a power transmission system in which, the transmission of power takes place through compressed air. The mechanical energy is given to compressor, that is, the shaft of the compressor is rotated by any means of the prime mover. The fluid Power system is a power transmission system in which, the transmission of power takes place by means of “oil under pressure” or “compressed air”. If “oil under pressure” is used in the system for power transmission then the system is called as hydraulic system.

8. The compressed air flows to the actuator through ____
a) pipes and valves
b) shafts
c) motors
d) flow control valve

Explanation: Compressor drives air from the atmosphere and the compressed air flow through actuator through pipes and valves. Actuator produces back the mechanical energy that can either be a linear motion of cylinder or rotary motion of the air motor shaft. The other sources mentioned in the options are not the sources for the flow of compressed air.

9. What is the function of an air dryer?
a) Removes dirt
b) Removes moisture
c) Controls the rate of flow
d) Controls the pressure

Explanation: The compressed air delivered by the compressor contains moisture from the atmosphere. This moisture is separated and removed by the air dryer. Only the dry compressed air is given to the pneumatic system.

10. Which part of the Pneumatic system stores the compressed air?
a) Air dryer
b) Air compressor
d) Air lubricator

Explanation: The air receiver tank stores the compressed air. Apart from storing the compressed air, it has several other functions also. It acts as cooler to cool the hot compressed air. It acts as moisture separator to separate and remove the water.

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