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Test: Bias Compensation - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Analog and Digital Electronics - Test: Bias Compensation

Test: Bias Compensation for Electrical Engineering (EE) 2024 is part of Analog and Digital Electronics preparation. The Test: Bias Compensation questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Bias Compensation MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Bias Compensation below.
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Test: Bias Compensation - Question 1

 The compensation techniques are used to_________

Detailed Solution for Test: Bias Compensation - Question 1

 Usually, the negative feedback is used to produce a stable operating point. But it reduces the voltage gain of the circuit. This sometimes is intolerable and should be avoided in some applications. So, the biasing techniques are used.

Test: Bias Compensation - Question 2

Compensation techniques refer to the use of_________

Detailed Solution for Test: Bias Compensation - Question 2

Compensation techniques refer to the use of temperature sensitive devices such as thermistors, diodes, transistors, sensistors etc to compensate variation in currents. Sometimes for excellent bias and thermal stabilization, both stabilization and compensation techniques are used.

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Test: Bias Compensation - Question 3

 In a silicon transistor, which of the following change significantly to the change in IC?

Detailed Solution for Test: Bias Compensation - Question 3

For germanium transistor, changes in ICO with temperature contribute more serious problem than for silicon transistor. On the other hand, in a silicon transistor, the changes of VBE with temperature possesses significantly to the changes in IC.

Test: Bias Compensation - Question 4

What is the compensation element used for variation in VBE and ICO?

Detailed Solution for Test: Bias Compensation - Question 4

A diode is used as the compensation element used variation in VBE and ICO. The diode used is of the same material and type as that of transistor. Hence, the voltage across the diode has same temperature coefficient as VBE of the transistor.

Test: Bias Compensation - Question 5

The expression for IC in the compensation for instability due to ICO variation_________

Detailed Solution for Test: Bias Compensation - Question 5

In this method, diode is used for the compensation in variation of ICO. The diode used is of the same material and type as that of transistor. Hence, the reverse saturation current IO of the diode will increase with temperature at the same rate as the transistor collector saturation current ICO.

Test: Bias Compensation - Question 6

Which of the following has a negative temperature coefficient of resistance?

Detailed Solution for Test: Bias Compensation - Question 6

The thermistor has a negative temperature coefficient of resistance. It means, its resistance decreases exponentially with increasing T. The thermistor RT is used to minimize the increase in collector current.

Test: Bias Compensation - Question 7

Increase in collector emitter voltage from 5V to 8V causes increase in collector current from 5mA to 5.3mA. Determine the dynamic output resistance.

Detailed Solution for Test: Bias Compensation - Question 7

: ro=∆VCE/∆IC
=3/0.3m=10kΩ.

Test: Bias Compensation - Question 8

The output resistance of CB transistor is given by _________

Detailed Solution for Test: Bias Compensation - Question 8

 The ratio of change in collector base voltage (∆VCB) to resulting change in collector current (∆IC) at constant emitter current (IE) is defined as output resistance. This is denoted by ro.

Test: Bias Compensation - Question 9

 The negative sign in the formula of amplification factor indicates_________

Detailed Solution for Test: Bias Compensation - Question 9

When no signal is applied, the ratio of collector current to emitter current is called dc alpha, αdc of a transistor. αdc=-IC/IE. It is the measure of the quality of a transistor. Higher is the value of α, better is the transistor in the sense that collector current approaches the emitter current.

Test: Bias Compensation - Question 10

Which of the following components are used for bias compensation in transistor circuits?

Detailed Solution for Test: Bias Compensation - Question 10

The purpose of the biasing is to switch on the BJT to work in the active region such that the DC collector current remains constant or Quiescent current or zero signal current independents of:

  • β (beta)
  • Temperature
  • Load variations


The commonly used methods are

  • Fixed base bias or Fixed bias
  • Biasing with the emitter resistor
  • Self - bias or Voltage divider bias


The stabilization occurs due to negative feedback action.

  • The negative feedback, although improves the stability of the operating point, reduces the gain of the amplifier.
  • As the gain of the amplifier is a very important consideration, some compensation techniques are used to maintain excellent bias and thermal stabilization.


Diode compensation for Instability

These are the circuits that implement compensation techniques using diodes to deal with biasing instability. 

There are two types of diode compensation methods. They are −

  • Diode compensation for instability due to VBE variation
  • Diode compensation for instability due to ICO variation


Diode Compensation for Instability due to VBE Variation

Diode Compensation for Instability due to IC0 Variation

Other compensation

Other compensation techniques refer to the use of temperature-sensitive devices such as diodes, transistors, thermistors, Sensistors, etc. to compensate for the variation in currents.

There are two popular types of circuits in this method, one using a thermistor and the other using a Sensistor.

Thermistor Compensation

  • A thermistor is a temperature-sensitive device.
  • It has a negative temperature coefficient.


Sensistor Compensation

A Sensistor is a heavily doped semiconductor that has a positive temperature coefficient.

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