Hitachi Hi-Rel Power Electronics Graduate Engineer Interview Questions and Answers

Q1. Aptitude Topics - Age, Profit and Loss, Verbal , Logical 1. The Sum of ages of 5 children born at interval of 3 yrs each is 50 yrs . what is the age of the youngest child ?
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Q2. JFET Terminal ? SCR Terminal ? If impurity is increased in intrinsic semiconductor , the breakdown voltage will ? Which Gate is used as inverter ? Which is difficult to fabricate in IC ? Resistivity...read more
Ans. 
Answering questions related to JFET, SCR, impurity in semiconductor, gates, IC fabrication, resistivity of silicon, and transistors.
• JFET terminals are Gate, Drain, and Source.

• SCR terminals are Anode, Cathode, and Gate.

• Increasing impurity in intrinsic semiconductor decreases breakdown voltage.

• MOSFET gate is used as an inverter.

• Diffusion of resistors is difficult to fabricate in IC.

• Resistivity of pure Silicon is around 2
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Each team has 15 mins of time
Topics
1.E-Vehicles in India (Pros and Corns)
2.Indian Youths choosing Politics as Career is encouraged / not ?
3.Indian Education / Foreign Education ?

Q1. - Be Very Clear in Area of Interest mentioned in Resume + Internship(Know the Basics) + workshop . CMRR Ratio ? Ideal Characteristics of OPAMP - I/P and O/P Impedance ? What is KCL ? Effective Resistor Pr...read more
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Some question was related to number, time and work

Q1. Difference between transistor and diode
Ans. 
Transistors are three-terminal semiconductor devices used for amplification and switching, while diodes are two-terminal semiconductor devices used for rectification.
• Transistors have three terminals: base, emitter, and collector, while diodes have two terminals: anode and cathode.

• Transistors can amplify signals and act as switches, while diodes allow current to flow in one direction only.

• Examples of transistors include...read more
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Q2. On which project you are working
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Q1. Self introduction
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Q2. Family background
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Q1. What is microcontroller
Ans. 
A microcontroller is a small computer on a single integrated circuit that is designed to control specific devices.
• It contains a processor, memory, and input/output peripherals on a single chip

• Used in various applications such as automotive, medical devices, and home appliances

• Examples include Arduino, Raspberry Pi, and PIC microcontrollers
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Q2. What is bridge wave rectifier
Ans. 
Bridge wave rectifier is a circuit that converts AC voltage into DC voltage using four diodes arranged in a bridge configuration.
• It is a type of full-wave rectifier

• It uses four diodes arranged in a bridge configuration

• It converts AC voltage into DC voltage

• It produces a higher output voltage than a half-wave rectifier

• It is commonly used in power supplies and battery chargers
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