16 Frequently Asked Questions in Electrical Professional Interview

Common 16 questions in electrical professional interviews are as follows:

1, what is the voltage drop after the diode of silicon material and germanium material is turned on?

2. What main parameters should be satisfied when choosing the rectifier diode model?

3. In the LED circuit, the forward voltage drop UF= 1.4V, the forward current IF= 10mA and the power supply voltage 5V are known. How to determine the current limiting resistance?

4.FET is a control device, which controls the electrode current through the electrode voltage. For P-channel and N-channel FET, it also controls the polarity of the drain voltage.

5. When the integrated operational amplifier is used for linear amplification, the signal is input from the noninverting terminal. Try to draw its circuit diagram and explain how to get the corresponding resistance.

6. List a common operational amplifier model and point out the importance of input offset voltage.

7. Try to draw the circuit diagram of the proportional-integral circuit composed of operational amplifier, and explain the selection of each component parameter.

8. An electronic circuit needs a set of 5V, 1A DC regulated power supply. Please design a power supply circuit and explain the general selection of required components.

9. In an electronic device, two sets of 15V power supplies are needed, and the load current is 200mA. The main three-terminal integrated voltage regulator is used to determine the effective value and capacity of the secondary voltage of the transformer.

10, TTL circuit and CMOS circuit are most commonly used in digital electronic circuits. Try to describe the main characteristics and common series models of TTL circuits and CMOS circuits.

1 1, what is the pull current?

What is the capacity of 12 and TTL driving load?

What are the functions of pins P0, P 1, P2 and P3 in 13.5 1 series single chip microcomputer?

14, what are the interrupt sources of single chip microcomputer?

15. There are two main methods to exchange information between computers and peripherals: parallel communication and serial communication. Try to tell their main advantages and disadvantages.

16, why I regulator and PI regulator can achieve no static error.

Interview notes

1. Be polite during the interview. Politeness is respect for the interviewer and the interviewer's first impression of his understanding.

2. It is very important to dress neatly in the interview. Don't be self-righteous and highlight your personality. For fresh graduates, the company will allow them to keep their student clothes. It is very suitable for fresh graduates to wear leisure suit, and it can also save money on interview dresses.

3. When interviewing, you should euphemistically explain your ability to cooperate with colleagues or groups. If you are good at communicating with people, you have the hope of being admitted. If you have work experience, you can mention it as much as possible to get the approval of the interviewer. If you have an appointment with the recruiter, be sure to arrive early and never be late.