Ae2

The diode rectifier works well enough if the supply voltage is much than greater than 0.7V. For smaller voltage (of few hundreds of millivolt) input which of the following can be used?

• Superdiode

• Peak rectifier

• Precision rectifier

• None of the mentioned

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

Consider a peak rectifier fed by a 60-Hz sinusoid having a peak value Vp = 100 V. Let the load resistance R = 10 kΩ. Calculate the fraction of the cycle during which the diode is conducting

• 1.06 %

• 2.12 %

• 3.18%

• 4.24%

Limiting and clamping circuits are employed in

• FM transmitters

• Television receivers and transmitter

• Production of various signal waveforms such as trapezoidal, square or rectangular waves

• All of the mentioned

Which of the following is true for LEDs

• The light emitted by a LED is inversely proportional to the current flowing through the diode

• LED operate in a manner opposite to the working of the optoelectronics or photodiodes

• LED cannot be used to generate coherent source of light

• None of the mentioned

Which circuit is used for obtaining desired output waveform in operational amplifier?

• Clipper

• Clamper

• Peak amplifier

• Sample and hold

In a positive clipper, the diode conducts when

• Vin < Vref

• Vin = Vref

• Vin > Vref

• None of the mentioned