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201.

The truth table for the following logic circuit is

  • ABY000011101110

  • ABY001011101111

  • ABY001010101110

  • ABY001011100111


202.

The transfer ratio B of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 2 kΩ. The peak value of the collector AC current for an AC input voltage of 0.02 V peak is

  • 200 μA

  • 0.01 mA

  • 0.25 mA

  • 500 μA


203.

In the circuit shown in figure, when the input voltage of the base resistance is 10 V, Vb, is zero and Vce is also zero. Value of β is

  • 133

  • 154

  • 196

  • 105


204.

Assertion: An n-type semiconductor has a large number of electrons but still it is electrically neutral.

Reason: An n-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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205.

A transistor connected at common emitter mode contains load resistance of 5 kΩ and an input resistance of 1 kΩ. If the input peak voltage is 5 mV and the current gain is 50, find the voltage gain.

  • 250

  • 500

  • 125

  • 50


206.

The output for the given, circuit is

          

  •  A + B  · B¯

  • (A · B) · B

  • ( A + B )·B

  • ( A · B ) + B


207.

If the plate resistance oftriode valve is 13 x 106 Ω and amplification factor is 21. The mutual conductance will be

  • 1.6 × 10-6 mho

  • 1.6 × 106 mho

  • 2.6 × 10-5 mho

  • 2.6 × 105 mho


208.

Assertion:  A p-n junction with reverse bias can be used as a photo-diode to measure light intensity. 

Reason:  In a reverse bias condition the current is small but it is more sensitive to change in intensity of incident light.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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209.

Assertion:  The output voltage and the input voltage of the NOT gate have 180° phase difference. 

Reason:  The logic NOT can be built using diode.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


210.

Assertion:  In a common emitter transistor amplifier, the input current is much less than the output current than output impedance. 

Reason: The common emitter transistor amplifier has higher input impedance than output impedance.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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