1.       The ideal OP-AMP has the following characteristics[GATE 2001-1Mark]

• R i  = ∞,

  A V = ∞,

  R o  = 0           

•  R i  = 0,

  A V = ∞,

  R o  = 0

•  R i  = ∞,

  A V = ∞,

  R o  = ∞           

•      R i  = 0,

  A V = ∞,

  R o  = ∞

2.An amplifier using an OP-AMP with a slew rate SR = 1 V/µsec has a gain of 40dB. If this amplifier has to faithfully amplify sinusoidal signals form dc to 20 kHz without any slew rate induced distortion, then the input signal level must not exceed[GATE-2002-2MArks]

• 795mV

• 395mV

• 79.5mV

• 39.5mV

If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 volts peak  to peak, without any DC component, then the output of the comparator has a duty cycle of [GATE-2003-1 Mark]

The oscillator circuit shown in the figure has an ideal inverting amplifier. Its frequency of oscillation in Hertz is [GATE-2003-2Marks]

For the operational amplifier circuit shown, the output saturation voltages are ±15V.The upper and lower threshold voltages for the circuit are, respectively.[GATE-2017 SET1- 1Mark]

• +5Vand -5V

• +7Vand -3V

• +3Vand -7V

• +3Vand -3V

If the input to the circuit of figure is a sine wave the output will be[GATE-1990-2 Marks]

• A half wave rectified sine wave

• A full wave rectified sine wave

• A triangular wave

• A square wave

The circuit shown in the figure is that of [GATE-1996-1 Mark]

• a non-inverting Amplifiers

• an inverting Amplifiers

• an oscillator

• a Schmitt trigger

For the Op-Amp circuit shown in the figure. V₀ is [GATE 2007-2 Marks]

• -2V

• -1V

• -0.5V

• 0.5V

Assume that the op-amp of the figure is ideal. If V_i is a triangular wave, then V₀ will be [GATE-2000: 1 Mark]

• square wave

• parabolic wave

• triangular wave

• sine wave

Assuming the op-amp to be ideal, the voltage gain of the amplifier shown below is [GATE-2010: 1 Mark]