Given an input ac-voltage, v = 120 sin120πt, if the SCR Vbr is 100V, What is the fire delay angle? a. 35 degrees b. 56 degrees c. 67 degrees d. 83 degrees

B. A step up chopper has a supply voltage of 250V while the output voltage is 500V. (a) Derive an equation for output voltage (b)If the period of the chopper be 100 μsec., determine the pulse width of the output voltage. (c) If the pulse width in (b) is reduced to one third for constant frequency operation, find the new output voltage.

ef

In a three phase (50Hz) full converter, the ripple frequency in output voltage?

Hw@: : A555 IC is Connected 95 slhown in fingune below; fingune Detarmine the range of oscillation finaguerney? Ans: VCC =1Ov 1ok trag. range (621H2 -4.7 kllz 4 7. loke 555 IC 2. CPotentiometa10oke D.olHF

Information: 2 Vp-p (Am = 1V) 20 Hz sine waveCarrier: 4 Vp-p (Ac = 2V) 500 Hz sine waveModulation Index: ma = 1DC offset: 0V ma=Acmax-Acmin/Acmax+Acmin for the modulated signal (AM) ,ma = 1;Calculate Acmax, Acmin and efficiency value.

solve 17

What is the relationship between the frequency of oscillation and capacitance in an RC phase shift oscillator.

The average value of a full-wave rectified voltage with a peak value of 75 Vis a. 53 V b. 47.8 V C. 37.5 V O d. 23.9 V

16 digital electronics Which of the following is true about the noise margin according to the figures given in the figure? b) the question is wrong d) none