Variable Frequency Control From Current Source: Control of induction motor employing variable frequency voltage sources was considered in previous section. This section considers motor control by Variable Frequency Control From Current Source (VFCS). An equivalent…
Facsimile (FAX) Machine - Definition, Operation and Applications: In addition to the basic signals consisting of speech, music, or telegraph codes, a telecommunications system is often required to transmit signals from a source of a…
Wien Bridge Oscillator using Op Amp: This is also called RC oscillator which uses RC type of feedback network. The main difference between phase shift and Wien bridge oscillator is that the R-C phase shift…
Bias Stability Factor of Transistor: Bias Stability Factor of Transistor - Only the fixing of a suitable operating point is not sufficient but it is also to be ensured that the operating point remains stable…
Power Dissipation Rating in Transistor: Maximum Power Dissipation - Consider the portion of the data sheet for the 2N3903 and 2N3904 transistor reproduced in Fig. 8-24. The total device dissipation (PD) is specified as 625 mW…
Summer Air Conditioning System Working: Summer air conditioning system is the most important type of air conditioning, in which air is cooled and generally dehumidified. Figure 9.10 shows a schematic arrangement of a typical summer…
Rheostatic Control Method: Rheostatic Control Method - Series armature-resistance control : Here the applied armature voltage is varied by placing an adjustable resistance Re in series with the armature as shown in Fig. 7.58 along…
Circuit Breaker Tester Classification: Circuit Breaker Tester can be classified into two main groups, viz. (i) type tests and (ii) routine tests. Type Tests: These are performed solely for the purpose of proving the correctness…
Advantages of Negative Feedback Amplifier: There are numerous advantages of negative feedback amplifier which outweigh its only drawback of reduction in gain. Among the advantages are : 1. Gain Stability:Â The voltage gain of an…
Classification of Electric Drive: Classification of Electric Drive are normally classified into three groups, based on their development, namely group, individual and multi motor electric drives. If several groups of mechanisms or machines are organised…