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Consider the following statements related to oscillator circuits : 1. The tank circuit of a Hartley oscillator is made up of a tapped capacitor and a common inductor. 2. The tank circuit of a Colpitts oscillator is made up of a tapped capacitor and a common oscillator. 3. The Wien Bridge oscillator is essentially a two-stage amplifier with an RC bridge in the first stage, and, the second stage serving as an inverter. 4. Crystal oscillators are fixed frequency oscillators with a high Q-factor.  Which of the following are true?
When UJT is used for triggering an SCR, the wave-shape of the signal obtained from UJT circuit is
When a UJT is used for triggering an SCR, then the wave shape of voltage obtained from the UJT circuit will be ____________
Consider the following statements (a) BJT is a current controlled device with high input impedance and high gain band width (b) FET is a voltage- controlled device with high input impedance and low gain bandwidth (c) UJT is a negative resistance device and can be used as an oscillator (d) FET and UJT can be used for amplification Which of the above statements are correct 
In case of the UJT firing circuit, when the UJT turns on
In comparing the operation of the half-controlled 2-pulse circuit with that of the fully-controlled circuit, which of the following statements are evident? 1. Since half the thyristors are replaced by diodes, a half-controlled converter costs less than a fully-controlled converter. 2. Due to the freewheeling action with a half-controlled bridge-circuit power factor is improved in half-controlled converters. 3. The AC supply current is more distorted due to its zero periods with the half-controlled circuit, compared to a fully-controlled bridge circuit. Select the correct answer using the code given below :
Pulse triggering can be only used by the _____________ type of triggering circuit
The improvement of Colpitts oscillator over Hately oscillator is, Colpitts oscillator’s performance in ___________
When constructing variable frequency oscillator among clapp oscillator and colpitts oscillator which one is preferred?
The tank circuit of a Hartley oscillator is shown in the figure. If M is the mutual inductance between the inductors, the oscillation frequency is
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