A Quiz About Three Phase Generator

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Questions: 10 | Attempts: 678 | Updated: Mar 21, 2023

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A Quiz About Three Phase Generator - Quiz

Three phase generators are machines powered by fuel and used in manufacturing plants and factories. They are greatly preferred to smaller generators because they supply three simultaneous alternating currents. Additionally, three-phase generators are known to be more durable, stronger, convertible, and efficient. Are you familiar with this kind of machine?

Questions and Answers

1.

What is used to power three-phase generators?
- A.
  
  Petrol
- B.
  
  Coal
- C.
  
  Diesel
- D.
  
  Biofuel
Correct Answer
C. Diesel

Explanation
Three-phase generators are typically powered by diesel fuel. Diesel engines are commonly used in industrial applications because they are efficient, reliable, and have a high power output. Diesel fuel is also readily available and has a longer shelf life compared to other fuels. Additionally, diesel engines can operate for longer durations without overheating, making them suitable for continuous use in generators.

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1
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2.

Which of these is not used as engines for three-phase generators?
- A.
  
  Steam engine
- B.
  
  Turbine
- C.
  
  Rollers
- D.
  
  Motor engine
Correct Answer
D. Motor engine

Explanation
A motor engine is not used as an engine for three-phase generators. Three-phase generators typically use steam engines, turbines, or rollers as engines to generate electricity. Motor engines, on the other hand, are typically used to convert electrical energy into mechanical energy, such as in cars or other machinery. Therefore, a motor engine does not fit the criteria of being used as an engine for three-phase generators.

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3.

What gas does three-phase generators produce?
- A.
  
  Carbon dioxide
- B.
  
  Carbon monoxide
- C.
  
  Hydrogen sulphide
- D.
  
  Nitrogen oxide
Correct Answer
B. Carbon monoxide

Explanation
Three-phase generators produce carbon monoxide gas. Carbon monoxide is a colorless and odorless gas that is produced when fuel, such as gasoline or diesel, is burned incompletely. It is a toxic gas that can be harmful or even fatal when inhaled in high concentrations. Carbon monoxide is often produced by generators as a byproduct of their combustion process. It is important to ensure proper ventilation when using generators to prevent the buildup of carbon monoxide gas.

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4.

Which of these is not part of a three-phase generator?
- A.
  
  Electric motor
- B.
  
  Circuit breaker
- C.
  
  Fuel tank
- D.
  
  Compressor
Correct Answer
D. Compressor

Explanation
A three-phase generator is a device that generates electrical power by converting mechanical energy into electrical energy. It consists of various components such as an electric motor, circuit breaker, fuel tank, and compressor. However, a compressor is not part of a three-phase generator. A compressor is typically used to increase the pressure of a gas or air, whereas a generator is specifically designed to produce electricity. Therefore, a compressor does not play a role in the generation of electrical power in a three-phase generator.

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5.

What is the reciprocating engine in three-phase generators?
- A.
  
  Fossil engine
- B.
  
  Piston engine
- C.
  
  Inverter engine
- D.
  
  Heat engine
Correct Answer
B. Piston engine

Explanation
A reciprocating engine is a type of engine that converts linear motion of a piston into rotational motion. In the context of three-phase generators, a piston engine is commonly used. This type of engine utilizes pistons that move back and forth within cylinders to convert the energy of fuel combustion into mechanical energy. The reciprocating motion of the pistons drives a crankshaft, which in turn rotates the generator's rotor to produce electrical power. Therefore, a piston engine is the correct answer for the reciprocating engine in three-phase generators.

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6.

What is the minimum amount of electricity three-phase generators produce?
- A.
  
  5 kVA
- B.
  
  10 kVA
- C.
  
  2 kVA
- D.
  
  12 kVA
Correct Answer
A. 5 kVA

Explanation
The minimum amount of electricity that three-phase generators produce is 5 kVA. This is the smallest power rating among the given options. It is important to note that kVA (kilovolt-ampere) is a unit used to measure apparent power, which is the combination of real power (measured in kilowatts) and reactive power.

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7.

What is the frequency of a three-phase generator rotating at 3600rpm?
- A.
  
  56 Hz
- B.
  
  60 Hz
- C.
  
  45 Hz
- D.
  
  90 Hz
Correct Answer
B. 60 Hz

Explanation
The frequency of a three-phase generator rotating at 3600rpm is 60 Hz. The frequency of an AC generator is determined by the number of rotations per minute (rpm) of the rotor. In a three-phase generator, there are three sets of windings that produce three separate voltages. Each set of windings produces a voltage that goes through a complete cycle (360 degrees) in one-third of a revolution. Therefore, for a generator rotating at 3600rpm, each set of windings would complete 60 cycles per second, resulting in a frequency of 60 Hz.

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8.

Which of these is not a basis for which three-phase generators are rated?
- A.
  
  Voltage
- B.
  
  Power
- C.
  
  Frequency
- D.
  
  Efficiency
Correct Answer
D. Efficiency

Explanation
Efficiency is not a basis for which three-phase generators are rated. Three-phase generators are typically rated based on factors such as voltage, power, and frequency. Efficiency is a measure of how effectively a generator converts input power into useful output power, but it is not directly used as a basis for rating the generator.

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9.

What part of three-phase generators drives the motor?
- A.
  
  Engine
- B.
  
  Shaft
- C.
  
  Piston
- D.
  
  Ignition system
Correct Answer
A. Engine

Explanation
The engine is the part of a three-phase generator that drives the motor. The engine is responsible for converting fuel into mechanical energy, which is then used to rotate the shaft of the generator. This rotation creates the necessary magnetic field that induces the three-phase current in the stator windings, ultimately driving the motor. The engine is the power source of the generator and provides the necessary force to generate electricity.

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10.

What part of a three-phase generator starts the engine?
- A.
  
  Piston
- B.
  
  Electric motor
- C.
  
  Ignition system
- D.
  
  Connection shaft
Correct Answer
C. Ignition system

Explanation
The ignition system is responsible for starting the engine in a three-phase generator. It provides the spark needed to ignite the fuel-air mixture in the engine's cylinders, initiating the combustion process and starting the engine. Without the ignition system, the engine would not be able to start and the generator would not be able to produce electricity.

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