Online Electrical Engineering Test - Electrical Engineering Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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If there is 6 A of current through the filament of a lamp, how many coulombs of charge move through the filament in 1.75 s?

10.5 C

105 C

3.4 C

34 C

[#]

The colored bands for a 4,700 ohm resistor with a ten percent tolerance are

yellow, violet, red, gold

yellow, violet, orange, gold

yellow, violet, red, silver

orange, violet, red, silver

[#]

When one of three series resistors is removed from a circuit and the circuit is reconnected, the current

increases

increases by one-third

decreases by one-third

decreases by the amount of current through the removed resistor

[#]

The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage

decreases

increases

remains the same

becomes zero

[#]

A certain circuit is composed of two parallel resistors. The total resistance is 1,403

. One of the resistors is 2 k

. The other resistor value is

1,403

4.7 k

2 k

3,403

[#]

A certain voltage divider consists of two 12 k

resistors in series. Which of the following load resistors will have the most effect on the output voltage?

1 M

24 k

18 k

12 k

[#]

A Wheatstone bridge is often shown in a "diamond" configuration.

True

False

[#]

In assigning the direction of branch currents,

the directions are critical

the directions are not critical

they must point into a node

they must point out of a node

[#]

The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

1,000 V

2,000 V

31.25 V

3,125 V

[#]

10.

When the current through the coil of an electromagnet reverses, the

direction of the magnetic field reverses

direction of the magnetic field remains unchanged

magnetic field expands

magnetic field collapses

[#]

11.

A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is

6 V

30 V

35 V

0 V

[#]

12.

The following coils are in parallel: 75

H, 40

H, 25

H, and 15

H. The total inductance is approximately

6.9

2.2

155

[#]

13.

A transformer changes ac to dc.

True

False

[#]

14.

A 47

resistor and a capacitor with a capacitive reactance of 120

are in series across an ac source. What is the circuit impedance, Z?

129

12.9

167

[#]

15.

A 1.2 k

resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

152.6

1,526

1,200

942

[#]

16.

In a series RLC circuit that is operating above the resonant frequency, the current

lags the applied voltage

leads the applied voltage

is in phase with the applied voltage

is zero

[#]

17.

Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if V_S = 4.5 V_RMS?

226 mW

2.26 mW

4.24 mW

424 mW

[#]

18.

Referring to Problem 5, how long will it take the capacitor to discharge if the internal resistance of the pulse source is 100

300

600

900

1.5 ms

[#]

19.

If a periodic pulse waveform has a pulse width and the time between pulses each equal to or greater than five time constants, the capacitor will

partially charge and fully discharge during each period of the input waveform

fully charge and partially discharge during each period of the input waveform

fully charge and fully discharge during each period of the input waveform

partially charge and partially discharge during each period of the input waveform

[#]

20.

In an RL differentiating circuit, the output voltage is taken across the resistor.

True

False

[#]

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