Test: Operational Amplifiers

i_o = ?

If ‘V’ is the voltage phasor and ‘I’ is the current phasor, then VI represents

Consider the circuit shown below

Que: If v_i = -2 V, then output v_o is

The circuit shown in fig. is at steady state before the switch opens at t = 0. The v_c(t) for t > 0 is

The LED in the circuit of fig. will be on if v_i is

In the circuit of fig. the CMRR of the op-amp is 60 dB. The magnitude of the v_o is

The analog multiplier X of fig. has the characteristics v_p = v₁v₂ The output of this circuit is

If the input to the ideal comparator shown in fig. is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of

In the op-amp circuit given in fig. the load current i_L is

In the circuit of fig. output voltage is |v_o| =1 V for a certain set of ω, R, an C. The |v_o| will be 2 V if 

In the circuit of fig. the 3 dB cutoff frequency is

The phase shift oscillator of fig. operate at f = 80 kHz. The value of resistance R_F is

The value of C required for sinusoidal oscillation of frequency 1 kHz in the circuit of fig. is 

In the circuit shown in fig. the op-amp is ideal. If β_F = 60, then the total current supplied by the 15 V source is

In the circuit in fig. both transistor Q₁ and Q₂ are identical. The output voltage at T = 300 K is

In the op-amp series regulator circuit of fig. V_z = 62. V, V_BE = 0.7 V and β = 60. The output voltage v_o is