211 SRI RAMAKRISHNA MISSION VIDYALYA POLYTECHNIC COLLEGE.

  Advantages of an Induction Generator The various  Advantages  of an  Induction Generator  are as follows: An induction generator requires less maintenance because of its robust construction. An ordinary cage motor is used as an induction generator as it is cheap. Parallel operation is possible without hunting. Speed variation of the prime mover is less prominent. The induction generator is smaller in size per Kilowatt output power. It needs less auxiliary equipment. It does not have to be synchronized to the supply line as that of the synchronous generator. The induction generator has a self-protection feature. In the case of the short circuit, if a fault occurs on its terminals, the excitation fails, and the machine stops the generation itself. Applications of an Induction Generator The use of induction generators started in the early twentieth century. In the 1960s and 1970s its usage has become very less but later its usage started again. They are used with...

WHAT IS IT, HOW IT EFFECTS HEADPHONES & WHAT YOU SHOULD KNOW. Have you ever noticed that your headphones may sounds different, or for that matter the volume level changes when being plugged into different audio devices? Perhaps the headphone impedance is too high for the audio source you have chosen. It can happen - and many users are not aware of the effects that this can bring when using headphones across different devices. In this article we explain what the term “impedance” is all about and what you should look out for when buying headphones. Meaning of the term "impedance". What does the impedance say? How does it affect the volume? What is the impedance? What else do I have to consider when buying headphones?        1. WHERE DOES THE TERM "IMPEDANCE" COME FROM? Now it is getting technical: The impedance (specified in ohms Ω) is a term from electrical engineering and in wired headphones it quantifies the electrical resistance of the voice coils in the trans...

    0   0   0   0   0 Applications of Electronics in Various Fields   Technology Electronic Electronic devices and technology are utilized in various industries and sectors for different purposes and functions. Consumer electronics refer to electronic gadgets that are specifically made and promoted for the general public's everyday use. Customer electronics refer to the devices and equipment that are designed for everyday use. This industry has a broad reach and is accessible to the general public. Office devices such as computers, FAX machines, scanners, calculators, projectors, etc., are among the various uses of this technology. In addition, it consists of domestic devices such as washers, fridges, microwaves, televisions, vacuums, gaming consoles, speakers, and so forth. Also, various high-level storage devices like a jukebox for hard disk drives DVDs (HDD), and other similar options. Robotics and AI Electronic systems are utilized in artificial in...

  Timer Control Register (TCON): TCON is another register used to control operations of counter and timers in microcontrollers. It is an 8-bit register wherein four upper bits are responsible for timers and counters and lower bits are responsible for interrupts. Timer Control Register (TCON) TF1:  The TF1 stands for ‘timer1’ flag bit. Whenever calculating the time-delay in timer1, the TH1 and TL1 reaches to the maximum value that is “FFFF” automatically. EX: while (TF1==1) Whenever the TF1=1, then clear the flag bit and stop the timer. TR1:  The TR1 stands for timer1 start or stop bit. This timer starting can be through software instruction or through hardware method. EX: gate=0 (start timer 1 through software instruction) TR1=1; (Start timer) TF0:  The TF0 stands for ‘timer0’ flag-bit. Whenever calculating the time delay in timer1, the TH0 and TL0 reaches to a maximum value that is ‘FFFF’, automatically. EX: while (TF0==1) Whenever the TF0=1, then clear the flag bit...

  Applications of Variable Frequency Drives Variable frequency drives are widely used in various industries and applications that require speed control of AC motors. Some of the common applications are: Fans: A VFD can control the speed and airflow of fans according to the temperature, pressure, or humidity requirements. This can save energy, reduce noise, improve comfort, and extend fan life.  Pumps: A VFD can control the speed and flow rate of pumps according to the demand or level requirements.  This can save energy, reduce wear, prevent water hammer, and improve process control. Compressors: A VFD can control the speed and pressure of compressors according to load and process requirements . This can save energy, reduce wear, prevent surges,and improve process control.  A VFD can also provide soft starting and stopping of the compressor, which can reduce inrush current, voltage drop, mechanical stress, and wear and tear. A VFD can also monitor and diagnose the con...

  Bistable multivibrator   is a type of two-state device similar to a monostable and stable multivibrator. However, the two states are stable, and a trigger is required to change them. In the case of a Bistable multivibrator, the output state is maintained indefinitely until an external trigger is applied to change the state. In a bistable multivibrator, a driving pulse is applied to the input, and the output pulse is contained when and why the triggering pulses are applied. Each output cycle is produced after two triggering pulses with the correct polarity and amplitude. The following figure shows the circuit diagram of a self-biased Bistable Multivibrator. Bistable Multivibrator Diagram Operation of Bistable Multivibrator When the circuit is switched ON, due to some circuit imbalances as in Astable, one of the transistors, say Q 1  gets switched ON, while the transistor Q 2  gets switched OFF. This is a stable state of the Bistable Multivibrator. By applying a...

  What is MOSFET? The MOSFET, also known as a metal-oxide-semiconductor field-effect transistor, is a type of FET with an insulated gate that is assembled by the controlled oxidation of that  semiconductor . The semiconductor used in it is generally silicon. In more detail, we can explain that it is a four-a terminal-based device that is composed of a, Source(S) Gate (G) Drain (D) Body (B) In a general overview, the body of a MOSFET is in connection with its source terminal hence forming a three-terminal device such as a field-effect transistor. It is normally considered a transistor and is utilized in both digital circuits and analog circuits. A MOSFET can function in two ways Depletion Mode Enhancement Mode Enhanced Mode Enhanced mode can be defined as if there is no voltage across the gate terminal then the device will not conduct. But when there is a maximum voltage present across the gate terminal then the conductivity of the device gets enhanced. Depletion Mode Depletion...

  AC Servo Motor Vs DC Servo Motor The difference between a DC servo motor and an AC servo motor includes the following. AC Servo Motor DC Servo Motor One kind of servomotor that utilizes AC electrical input to generate mechanical output is called an AC servo motor. One kind of servomotor that utilizes DC electrical input to generate mechanical output is called a DC servo motor. AC servo motor delivers low output power. DC servo motor delivers high output power. These motors are adjustable for high-speed operating conditions. These motors are adjustable for low-speed operating conditions. These types of motors develop high torque. These types of motors develop low torque. The operation of this motor is stable, smooth & less noise based. The operation of this motor is less stable, and noisy. These motors have less efficiency. These motors have high efficiency. These motors have fewer stability problems. These motors have more stability problems. In these motors, there is no elec...