basic Electronics and LIC

An ideal op-amp requires infinite bandwidth because

• Signals can be amplified without attenuation

• Output common-mode noise voltage is zero

• Output voltage occurs simultaneously with input voltage changes

•   Output can drive infinite number of device

   

A simple diode rectifier has ‘ripples’ in the output wave which makes it unsuitable as a DC source. To overcome this one can use

• A capacitor in series with a the load resistance

• A capacitor in parallel to the load resistance

• Both of the mentioned situations will work

• None of the mentioned situations will work

Bridge rectifier is an alternative for

• Full wave rectifier

• Peak rectifier

• Half wave rectifier

• None of the mentioned

Zener diodes are also known as

• Voltage regulators

• Forward bias diode

• Breakdown diode

• None of the mentioned

     In a pn junction the potential barrier is due to the charges on either side of the junction,these charges are

• Majority carriers

• Minority carriers

• Both a and b

• Fixed donor and accepted ions

  When a pn junction is reverse biased

• Holes and electrons tend to concentrate towards the junction

• The barrier tends to break down

• Holes and electrons tend to move away the junction

• none of these

 In which amplifier the output voltage is equal to the negative sum of all the inputs?

• Averaging amplifier

• Summing amplifier

• Scaling amplifier

•    All of the mentioned

Determine the expression of output voltage for inverting summing amplifier consisting of four internal resistors? (Assume the value of internal resistors to be equal

• V_o = -(R_f/R )×(V_a +V_b+V_c+V_d)

• V_o = (R_F/R)×(V_a +V_b+V_c+V_d)

• V_o = (R/ R_F)×(V_a +V_b+V_c+V_d)

• None of the mentioned

Determine the output voltage of the differentiator?

• V_O = R_F×C₁×[dV_in/dt].

• V_O = -R_F×C₁×[dV_in/dt]

• V_O = R_F×C_F×[dV_in/dt].

• None of the mentioned

The op-amp operating in open loop result in output of the amplifier to saturate at a voltage

• Close to op-amp positive power supply

• Close to op-amp negative power supply

• Close to op-amp positive or negative power supply

•     None of the mentioned