Online Electronic Devices Test - Electronic Devices Test 2

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Total number of questions: 20.
Time allotted: 30 minutes.
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Determine the value of the load resistor.

R_L = 5 k

R_L = 5.5 k

R_L = 6 k

None of the above

[#]

In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by ________ the value of the filter capacitor or ________ the load resistors.

decreasing, decreasing

decreasing, increasing

increasing, decreasing

increasing, increasing

[#]

As the temperature increases,

________, V_BE ________, and I_CO ________ in value for every 10ºC.

increases, decreases, doubles

decreases, increases, remains the same

decreases, increases, doubles

increases, increases, triples

[#]

The ________ of the input signal is one of the first concerns in the sinusoidal ac analysis of transistor networks.

period

frequency

magnitude

None of the above

[#]

Refer to the following curves. Calculate I_D at V_GS = 1 V.

8.167 mA

4.167 mA

6.167 mA

0.616 mA

[#]

When plotting the transfer characteristics, choosing V_GS = 0.5V_P will result in a drain current level of ________ I_DSS.

0.25

0.5

[#]

Refer to this Figure. If V_in was increased in amplitude a little, the signal voltage at the source of Q₂ would

increase.

decrease.

remain the same.

distort.

[#]

The midrange open-loop gain of an op-amp is 135 dB. With negative feedback this gain is reduced to 72 dB. The closed-loop gain is

135 dB.

72 dB.

207 dB.

63 dB.

[#]

The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of ________.

CMRR

common-mode gain

closed-loop gain

open-loop gain

[#]

10.

The output impedance of a voltage buffer is ________.

very low

low

high

very high

[#]

11.

________ amplifiers have the highest overall efficiency.

Class A

Class B or AB

Class C

Class D

[#]

12.

What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator?

90°

180°

270°

360°

[#]

13.

In the phase-shift oscillator, the gain of the amplifier stage must be ________.

less than 29

greater than 29

[#]

14.

In which period is the capacitor filter discharged through the load in a full-wave rectifier?

The time during the positive cycle

The time during which the diodes are not conducting

The time during which the diode(s) is (are) conducting

The time during the negative cycle

[#]

15.

Which of the following is (are) diodes?

Schottky

Varactor

Tunnel

All of the above

[#]

16.

The current capability of power diodes can be increased by placing two or more of the diodes in ________, and the PIV rating can be increased by stacking the diodes in ________.

parallel, parallel

series, parallel

parallel, series

series, series

[#]

17.

In a half-wave variable-resistance phase control operation, the control cannot be extended past a ________ phase displacement.

45º

90º

135º

180º

[#]

18.

Refer to this figure. The value of

_DC = 100 and V_IN = 8 V. Determine I_C(sat).

18 mA

7.92 mA

1.8 mA

[#]

19.

The main purpose of an instrumentation amplifier is to amplify small signals riding on large common-mode voltages.

True

False

[#]

20.

OTA stands for operational transistor amplifier.

True

False

[#]

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