Electronic Mechanic Mock Test for Students

According to the Edison effect, a metal plate surrounding the cathode, if kept at a positive potential with respect to the cathode

1. The electrons emitted from the cathode will be reaching the plate and there will be an electric current.

2. The electrons will not be emitted.

3. The electrons emitted from the cathode will be reaching the plate but there will be no electric current

4. None of the above

Option 1 – The electrons emitted from the cathode will be reaching the plate and there will be an electric current

The rectifier efficiencies for half-wave and full-wave rectifiers are respectively

1. 40.6% and 81.2%

2. 35.6% and 71.4%

3. 39.8% and 76.9 %

4. 30.6% and 61.2%

Option 1 – 40.6% and 81.2%

In the NPN transistor circuit, the collector current is 10 mA. If 95% of the electrons emitted reach the collector, then what is the base current?

1. 10.53 mA

2. 0.53 mA

3. 11.06 mA

4. None of above

Option 2 – 0.53 mA

If the barrier potential changes with bias ing of a P-N junction diode then the barrier potential will.

1. Decreases with both reverse and forward bias

2. Increases with both reverse and forward bias

3. Increases with reverse bias and decreases with forward bias

4. Increases with forward bias and decreases with reverse bias

Option 3 – Increases with reverse bias and decreases with forward bias

Which of the following filter circuit is used for high load current only?

1. T- section filter

2. L- section filter

3. Series inductance filter

4. Shunt capacitor filter

Option 3 – Series inductance filter

In the case of intrinsic semiconductors the number of electrons in the conduction band

1. Is equal to the number of holes in the valence band.

2. Is equal to the number of filled spaces in the valence band.

3. Is less than the number of holes in the valence band.

4. None of above

Option 1 – Is equal to the number of holes in the valence band

Which of the following atoms is known as a donor atom if donates or contributes one electron to the conduction band of pure Germanium?

1. Tetra valent atom.

2. Divalent atom

3. Penta valent atom

4. None of these

Option 3 – Penta valent atom

Which of the following elements when added to a pure Ge crystal forms an n-type Extrinsic semiconductor?

1. Antimony

2. Cadmium

3. Gallium

4. Indium

Option 1 – Antimony

At what temperature, there are no electrons in the conduction band of semiconductors, and the valence band is completely foiled?

1. 300°K

2. 273°K

3. 0°K

4. 0°C

Option 3 – 0°K

Following statements regarding semiconductors and choose the correct answer using these codes. 1. Semi-conductors have a negative temperature coefficient of resistance. Phosphorous, sulfur, and chlorine are all 2. semiconductors. 3. Their electrical conductivity is very much affected by even a very minute amount of impurity added to it. 4. None of the above Codes:

1. Only (1) and (2)

2. Only (3) is true

3. Only (2) and (3) are true

4. None of above

Option 1 – Only (1) and (2)

Addition of P-type impurity to intrinsic semiconductor results in

1. Decreases in the concentration of free electrons below the intrinsic value.

2. Increases in the number of holes above the intrinsic value.

3. Decreases in the number of holes below the intrinsic value.

4. None of above

Option 1 – Decreases in the concentration of free electrons below the intrinsic value

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