Electrical Manufacturing Company Junior PCB Engineer Interview Questions and Answers

Technical questions (be prepared)

Q1. Basic laws like right hand thumb rule
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Q2. Questions related to Electrical Machines
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Q1. How to reduce resistance for transformer
Ans. 
To reduce resistance in a transformer, one can use low resistance materials, increase the cross-sectional area of the winding, and minimize the length of the winding.
• Use low resistance materials for the transformer windings

• Increase the cross-sectional area of the winding to reduce resistance

• Minimize the length of the winding to reduce resistance

• Ensure proper insulation to avoid any short circuits

• Maintain proper cooling
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Q1. What is synchronous and histerisis motor
Ans. 
Synchronous motor runs at a constant speed while hysteresis motor has a rotor that follows the rotating magnetic field.
• Synchronous motor is used in applications where constant speed is required, such as in clocks and timers.

• Hysteresis motor is used in applications where precise control of speed is required, such as in record players and tape recorders.

• Synchronous motor has a stator and rotor that rotate at the same spe...read more
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Q2. Different between plc and scada
Ans. 
PLC is a hardware device that controls industrial processes, while SCADA is a software system that monitors and controls those processes.
• PLC is a programmable logic controller that controls the input/output of industrial processes.

• SCADA is a supervisory control and data acquisition system that collects and analyzes data from the industrial processes.

• PLC is a hardware device, while SCADA is a software system.

• PLC is used...read more
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Q3. Different between relay and contactor
Ans. 
Relays are used for low power applications while contactors are used for high power applications.
• Relays are typically used in control circuits to switch low power loads such as lights and fans.

• Contactors are used to switch high power loads such as motors and compressors.

• Relays have a lower current rating than contactors.

• Contactors have larger contacts and can handle higher currents than relays.

• Relays are typically smal...read more
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Q4. Different between switch and relay
Ans. 
Switches are used to control the flow of current in a circuit, while relays are used to switch a circuit on or off.
• Switches are manually operated, while relays are electrically operated.

• Switches are used in low voltage applications, while relays are used in high voltage applications.

• Switches are simple in construction, while relays are more complex.

• Examples of switches include light switches and toggle switches, while ...read more
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Q1. Different between switch and timer
Ans. 
Switch is an electronic component used to connect or disconnect a circuit while a timer is a device used to measure time intervals.
• Switch is used to turn on/off a device while timer is used to control the duration of a device's operation.

• Switch is a binary device with two states (on/off) while timer can be analog or digital and can measure time in seconds, minutes, or hours.

• Examples of switches include light switches, ...read more
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Q1. Testing of energy meters, CTs and PTs etc.
Ans. 
Testing of energy meters, CTs and PTs involves verifying their accuracy and functionality.
• Energy meters are tested to ensure they measure energy consumption accurately.

• CTs (Current Transformers) are tested to verify their current ratio and accuracy.

• PTs (Potential Transformers) are tested to verify their voltage ratio and accuracy.

• Testing may involve simulating different load conditions and measuring the output.

• Calibrat...read more
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Q1. How energy meter will be test on line mode at site.
Ans. 
Energy meter can be tested on line mode at site using a portable test equipment.
• Use a portable test equipment to simulate the load and measure the output of the energy meter.

• Ensure that the test equipment is calibrated and accurate.

• Perform the test during normal operating conditions to get accurate results.

• Compare the readings with the manufacturer's specifications to determine if the energy meter is functioning proper...read more
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Q2. How CT will be test at site with load condition.
Ans. 
CT can be tested at site with load condition using a test kit and a load bank.
• Use a test kit to measure the CT ratio and polarity

• Connect the CT to a load bank to simulate load conditions

• Measure the output voltage and current of the CT under load

• Compare the measured values with the CT specifications

• Repeat the test for different load conditions

• Ensure safety precautions are taken during the test
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Q1. How PT will be test at load condition.
Ans. 
PT can be tested at load condition by applying the load and measuring the voltage and current.
• Apply the load to the PT

• Measure the voltage and current using appropriate instruments

• Calculate the power factor and accuracy of the PT

• Ensure that the PT is within the acceptable limits of error

• Repeat the test at different load conditions to ensure accuracy
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Q2. How over current relay will be set according to the load described.
Ans. 
Over current relay is set based on the load current and time characteristics.
• Determine the maximum load current and time characteristics

• Select the appropriate over current relay type and current rating

• Calculate the relay settings based on the load current and time characteristics

• Adjust the settings to ensure proper coordination with other protective devices

• Test the relay to ensure proper operation
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Q1. Regarding production sequence
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Q2. IPQ,TQM,ISO RELATED QUISTION
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