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BU2: Electrical and Mechanical Systems (AUSAT) | Latest Update | 2024/2025 | Rated A+

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BU2: Electrical and Mechanical Systems |

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BU2: Electrical and Mechanical Systems (AUSAT) | Latest Update | 2024/2025 | Rated A+ What is the main function of a transformer in an electrical system? A transformer is used to change the voltage levels in an electrical system, either stepping it up or stepping it down, depending on the...

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Uploaded on October 8, 2024
Number of pages 52
Written in 2024/2025
Type Exam (elaborations)
Contains Questions & answers

bu2 electrical and mechanical systems ausat l

Institution BU2: Electrical and Mechanical Systems |
Course BU2: Electrical and Mechanical Systems |

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BU2: Electrical and Mechanical Systems
(AUSAT) | Latest Update | 2024/2025 |
Rated A+

What is the main function of a transformer in an electrical system?

✔✔ A transformer is used to change the voltage levels in an electrical system, either stepping it

up or stepping it down, depending on the needs of the circuit.

How is electrical power typically transmitted over long distances?

✔✔ Electrical power is transmitted over long distances using high-voltage transmission lines to

minimize energy loss due to resistance in the wires.

What is the purpose of a circuit breaker in an electrical system?

✔✔ A circuit breaker automatically interrupts the electrical flow in a circuit when it detects an

overload or short circuit, protecting the system from damage.

What happens to electrical resistance as the temperature of a conductor increases?

✔✔ The electrical resistance of most conductors increases as the temperature increases due to

increased collisions between electrons and atoms.

1

,What is the function of a capacitor in an electrical circuit?

✔✔ A capacitor stores and releases electrical energy in a circuit and is used for smoothing out

voltage fluctuations, filtering signals, and in timing applications.

What is the principle behind electromagnetic induction?

✔✔ Electromagnetic induction is the process by which a changing magnetic field induces an

electric current in a conductor, based on Faraday’s Law.

What is the role of a rectifier in an electrical system?

✔✔ A rectifier converts alternating current (AC) to direct current (DC), allowing electronic

devices to operate with a steady DC supply.

How does a synchronous motor maintain constant speed under varying loads?

✔✔ A synchronous motor maintains constant speed by operating in synchronization with the

frequency of the AC supply, as its rotor spins at the same speed as the rotating magnetic field.

What is the primary function of an alternator in a mechanical system?

2

,✔✔ The primary function of an alternator is to convert mechanical energy into electrical energy

by generating alternating current (AC).

How does a flywheel contribute to the operation of a mechanical system?

✔✔ A flywheel stores rotational energy and helps maintain a steady output by smoothing out

fluctuations in mechanical energy from the power source.

What is the purpose of a throttle valve in an internal combustion engine?

✔✔ A throttle valve regulates the amount of air entering the engine's intake manifold, thereby

controlling the engine’s power and speed.

How does a centrifugal pump increase fluid pressure in a mechanical system?

✔✔ A centrifugal pump increases fluid pressure by using a rotating impeller to impart kinetic

energy to the fluid, which is then converted to pressure energy as the fluid moves through the

pump.

What is the function of a heat exchanger in a mechanical system?

✔✔ A heat exchanger transfers heat from one fluid to another without mixing them, often used

to cool or heat components of mechanical systems.

3

, How does a gear train transmit mechanical power between shafts?

✔✔ A gear train transmits mechanical power between shafts by using interlocking gears to

increase or decrease speed and torque depending on the gear ratios.

What is the primary use of a governor in a mechanical system?

✔✔ A governor is used to regulate the speed of a machine, such as an engine or turbine, by

controlling the fuel supply or load.

What role does lubrication play in reducing wear and tear in mechanical systems?

✔✔ Lubrication reduces friction between moving parts in mechanical systems, preventing

excessive wear, overheating, and material damage.

How does a DC motor convert electrical energy into mechanical energy?

✔✔ A DC motor converts electrical energy into mechanical energy by generating a magnetic

field that interacts with the motor's armature, causing it to rotate.

What is the purpose of a commutator in a DC motor?

4

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Exam (elaborations)

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