1. The JFET is (a) a unipolar device (b) a voltage-controlled device (c) a current-controlled device (d) answers (a) and (c) (e) answers (a) and (b) 2. The channel of a JFET is between the (a) gate and drain (b) drain and source (c) gate and source (d) input and output

Figure below shows a 4-input OR gate built using a chain of gates. Determine the activity factors at each node in the circuit assuming the input probabilities PA= PB = Pc = PD=0.5. C D an am P = am Domz an am ng a

Q4-What is the fire angle that required to design an R-triggering circuit for a half wave controlled rectifier for SCR, the following parameters are applicable Ig(min) = 0.5mA, Vgt(min) 50HZ „Resistance in gate current path = 60 k2. 0.7V, Vd=0.7V, Supply voltage = 30 V, LOAD R VsVsinot strical Pow Dept II >

cuicuit designed in winknown isubuenit, va resistance R = 2.8K2 and two identical silicon BITS T1 and 12 with 72 and T2 with forward gains BF = 200. The supply voltage Vcc =-25 volts Vcc=25 volts Sub-circuit JICA T2 IB₁1 IB12 VIR R = 28K2 VIC, 2 GIND IB, 1 and Ic, s designate the base and collector current of T2 vespectively where as the courrents IB,₁2 and IG2 designate the base and the collector currents of T2 respectively. T2 and 12 operate in forward active mode Assume that IB, 1 and IB₁2 are equal · VBE, on = 0.8 molt (Threshold woltage) (a) What is the value of the current IR through vesistance R.? (MA) (b) what is the value of the base vaurrent IB, 1? (MA) (c) what is the value of the collector Ic₁₁? (MA) (d) The evicuit idesigned using Resistance Rand Transistors T₁ and To performs an electronic function to connect to sub circut which function is it?

(Asterisked problems are associated with optional sections.) 1. Determine the output of each of the following circuits, assuming that the upper input is 1 and the lower input is 0. What would be the output when the upper input is 0 and the lower input is 1? a. b. C. D D nia 00

Question 3 The 555 timer is connected in the following circuit. The resistance of the extra resistor is 102, the capacitance of the extra capacitor is 0.1F. The voltage input at Pin2 is Vcc. What is the output state at Pin3? 1) 2) Decide the voltage input value at Pin 6 when the condition is stable. 3) Decide the output state at Pin3 when a trigger input is applied at Pin2 (voltage input at Pin2 changes from Vcc to 0, and return back to Vcc immediately). 4) After the trigger input is applied at Pin2, how long would the output maintain at the unstable state. Vc R O Output Vo 555 Vc 0.01µF Trigger Input