Test: Electronics - 1 - Physics MCQ

C_D = depletion capacitance ; 
Depletion capacitance/ m2

Given β = 30, V_CE = 6 V " quiscent point", V₁ = ?

We know V_BE = 0.7 V, “Si” BJT


K C L at point “A ” 
Put value of I_B, V₁ = 3.955

Square wave generator frequency is equal to

Led will glow when it is in forward bias, it means output of NAND gate is "O’, since p-terminal of led is applied to +5V. Output of NAND gate is always "1” irrespective of the switch position.

Frequency of output Q = ?

The SR flip-flop actually has three inputs, Set, Reset and its current state. The Invalid or Undefined State occurs at both S and R being at 1

3-stage Johnson-counter ⇒ but not D-flip flop, so find complete output Q₂ Q₁ Q₀ = 1 0 1

Hence after clock pulse. Sequence

Q₃  Q₂ Q₁ Q₀ = 1000 is repeated.
 

Frequency is equal to

...(a)
.....(b)
Find I₁ and I₂. if I₁ and I₂ are positive finite then both the diode are ON. Check: D₂-diode-ON

Inverting-Amplifier is an example of voltage shunt feedback

CKT is standard wein bridge osicllator

Given circuit is an LPF-circuit behaves as integrators

Integration of square wave is triangular wave (starting with negative slope)

⇒ Low frequency capacitor open,  is finite
⇒ High frequency capacitor short, 
So, its 0 - LPF

V_x = ?

Design this function using basic gate first

We Know,

⇒ Add-inverter at output of AND-gate


Therefore. 5 NAND-gate needed.

Given: V_A-V_B= 6V and R_AB = 2Ω
∴ 
Current enter into the port = Current out from port.
∴ I_DC = 3 A

Applying nodal analysis at P.
-2 A - 3A +1 = 0
I = 5A