Electronic Principles – Section 1

1. In an intrinsic semiconductor, the number of free electrons

A. Equals the number of holes
B. Is less than the number of holes
C. Is greater than the number of holes
D. Impossible to say
E. None of the above

Correct Answer:  A. Equals the number of holes

2. A device that converts mechanical into electrical energy is?

A. solar cell
B. thermocouple
C. chemical cell
D. generator
E. None of the above

Correct Answer:  D. generator

3. Which one of the following kinds of materials has the lowest permeability?

A. A diamagnetic material
B. A paramagnetic material
C. A ferromagnetic material
D. All of the above
E. None of the above

Correct Answer:  A. A diamagnetic material

4. The total impedance of a parallel RLC circuit:

A. always increases as the applied frequency increases
B. is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
C. always decreases as the applied frequency increases
D. is maximum at the resonant frequency
E. None of the above

Correct Answer:  D. is maximum at the resonant frequency

5. The rise time of a pulse waveform is the time required for the voltage to rise:

A. from zero to its rms value
B. from zero to its peak value
C. from 10% of the peak value to 70.7% of the peak value
D. from 10% of the peak value to 90% of the peak value
E. None of the above

Correct Answer:  D. from 10% of the peak value to 90% of the peak value

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