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Q. What is the basic principle of oscillators?
In an oscillating circuit, the amplitude of voltage or current oscillations decays with time owing to the dissipation of energy in the resistance contained in the circuit. If a negative resistance is incorporated in the circuit to generated energy that compensates for the loss of energy through the passive resistance, oscillations with undiminished amplitude can occur. Basically, therefore, a negative resistance must be provided in an oscillator. This is accomplished in a feedback oscillator by providing an external positive feedback to make the overall gain infinite. In a negative resistance oscillator, the desired negative resistance is supplied by internal positive feedback.
No external signal is applied to an oscillator. When the power supply to the system is switched on, a noise voltage is produced. The frequency spectrum of noise being very wide, it always has a voltage component at the frequency required for the oscillator. Thus the initial signal to trigger the oscillations is obtained from the noise voltage. The ac power of the output signal is supplied by the dc supply source.
ADD Instruction This instruction use to add contents of any register or memory location with the contents of accumulator. There are two formats for ADD instruction to ad
Consider the operation of a dc shuntmotor that is affected by the following changes in its operating conditions. Explain the corresponding approximate changes in the armature curre
Q. Explain Position servo in a radar system? Figure depicts the essential elements of a position servo system. In a radar system, an electromagnetic pulse is radiated from an a
Can we measure the resistor if it is installed in circuit board? Ans) You can calculate a resistor in a circuit but the circuit will most likely affect the value read (general
GAS HAZARDS IN THE LABORATORY : As mentioned in the introduction of this unit, the gas hazards in a laboratory arise from LPG and other compressed gases. Though the use of gas for
Explain Series capacitors These are connected in series with the line conductors and are used to reduce the inductive reactance of long transmission lines and hence the voltage
CMC Complement Carry Instruction This instruction complements the carry flag i .e if the carry flag is 1 before the execution of this instruction it will be reset and if
Assembly Language Programming In this chapter we will discuss programming in assembly language and machine language. The difference in machine assembly and high
what does actually feredy law wants to proof.
Q. Explain working of Biased Clamper? Biased Clamper : The circuit of a positively biased clamper is shown in the figure. During the negative half cycle of the input signal the
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