Huagong Tech Service Engineer Interview Questions, Process, and Tips

Basic types os sensor and relay and motors

Q1. What is the sensor and type ?
Ans. 
A sensor is a device that detects and responds to a physical input or stimulus, converting it into an electrical signal.
• Sensors are used in various industries and applications, such as automotive, aerospace, healthcare, and environmental monitoring.

• There are different types of sensors, including temperature sensors, pressure sensors, proximity sensors, and motion sensors.

• Examples of sensors include thermocouples, accel
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Q2. What is relay and type?
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A relay is an electrically operated switch that uses an electromagnet to mechanically control the switching action.
• Relays are used to control high power or high voltage circuits with a low power signal.

• They can be classified into different types based on their construction and operation, such as electromagnetic relays, solid-state relays, thermal relays, etc.

• Electromagnetic relays use an electromagnet to control the sw...read more
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Q3. What is motors and its types?
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Motors are devices that convert electrical energy into mechanical energy. There are various types of motors.
• DC motors convert electrical energy into mechanical energy using a magnetic field. They are commonly used in household appliances.

• AC motors are used in industrial applications and are more efficient than DC motors.

• Stepper motors are used in robotics and automation as they can move in precise steps.

• Servo motors ar...read more
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Q4. We know there are generally two types of motors, AC motor, and DC motor. AC motors are flexible for speed control and demand low power during start. On the other hand, DC motors are widely used due to its ...read more
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Q5. What is difference between AC& DC current?
Ans. 
AC current changes direction periodically while DC current flows in one direction only.
• AC current is used for power transmission over long distances while DC current is used for electronic devices.

• AC current can be easily transformed into different voltage levels using transformers while DC current cannot.

• AC current is more dangerous to humans than DC current at the same voltage level.

• Examples of AC devices include air...read more
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Q6. Electric current flows in two ways as an alternating current (AC) or direct current (DC). The main difference between AC and DC lies in the direction in which the electrons flow. In DC, the electrons flow ...read more
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AC and DC differ in the direction of electron flow. DC flows steadily in one direction while AC switches direction.
• AC stands for alternating current while DC stands for direct current

• AC is commonly used in household appliances while DC is used in batteries and electronic devices

• AC can travel long distances without losing much energy while DC cannot

• Examples of AC sources include power grids and generators while examples
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