Question: In a different amplifier using two FETs, a resistance has to be reducing the meter current to zero even when no voltage is applied to the circuit. This is necessitated on account of :
Answer:
MCQ: In a different amplifier using two FETs, a resistance has to be reducing the meter current to zero even when no voltage is applied to the circuit. This is necessitated on account of :
Correct Answer:
A. Mismatch between characteristics of the FETs
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Related Questions
- 1. The resistances, R<sub>D </sub>Connected in the bridge circuit of a difference amplifier type of electronic voltmeter are each 10kΩ. The value of R<sub>D </sub>is much smaller than the value of a.c drain resistance, r<sub>d,</sub> of FETs. The trans-conductance of FETs is 0.005 mho. The value of current through the meter when an input voltage of 1V is applied to the gate of left FET with the gate of right hand FET grounded , and the meter resistance almost negligible is :
- 2. In a source follower type electronic voltmeter, the trans-conductance of FETs is 0.005 mho and the resistance of the meter is 100Ω. The approximate value of current through the meter, when the input voltage is 1 V, is :
- 3. The power consumption of a d.c voltmeter using a direct coupled amplifier when measuring a voltage 0.5 V is of the order of :
- 4. A chopper stabilized a.c amplifier may use :
- 5. Electronic voltmeters which use rectifiers employ negative feedback. This is done
- 6. A voltage having symmetrical square waveshape is applied to an average reading voltmeter with scale calibrated in terms of rms value of a sinusoidal wave has an error of :
- 7. A true rms reading voltmeter uses two thermocouples in order
- 8. In an electronic ohmmeter, an OP-AMP is used as a :
- 9. A voltmeter with a broad band width has :
- 10. In a circuit of RF voltmeters
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