Electronic Principles - Section 1 (6)

41.

When the collector current increases, what does the current gain do?

A.	decreases
B.	stays the same
C.	increases
D.	any of the above
E.	None of the above

Answer: Option C

Explanation:

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42.

Waveforms are graphs that show:

A.	frequency on the vertical axis and amplitude on the horizontal axis
B.	amplitude on the vertical axis and frequency on the horizontal axis
C.	amplitude on the vertical axis and the passage of time on the horizontal axis
D.	the passage of time on the vertical axis and amplitude on the horizontal axis
E.	None of the above

Answer: Option C

Explanation:

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43.

In a pure inductor:

A.	ac current leads the voltage by 90 degree
B.	ac current and voltage are exactly in phase
C.	ac current lags the voltage by 90 degree
D.	ac current is converted to dc voltage
E.	None of the above

Answer: Option C

Explanation:

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44.

The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

A.	rotor
B.	armature
C.	battery
D.	commutator
E.	None of the above

Answer: Option D

Explanation:

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45.

For a pure capacitor:

A.	ac current and voltage are exactly in phase
B.	ac current leads the voltage by 90 degree
C.	ac current is converted to dc voltage
D.	ac current lags the voltage by 90 degree
E.	None of the above

Answer: Option B

Explanation:

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46.

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

Answer: Option D

Explanation:

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47.

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

Answer: Option D

Explanation:

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48.

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

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

Answer: Option A

Explanation:

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