Electrical Engineering Test - Random - Online Electrical Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Marks : 2/20

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A 120

resistor must carry a maximum current of 25 mA. Its rating should be at least

4.8 W

150 mW

15 mW

480 mW

[#]

The following resistors (one each) are connected in a series circuit: 470

, 680

, 1 k

, and 1.2 k

. The voltage source is 20 V. Current through the 680

resistor is approximately

60 mA

30 mA

6 mA

300 mA

[#]

Two 1.5 V cells are connected series opposing across two 100

resistors in series. Total current flow is

15 mA

5 mA

2 mA

0 A

[#]

The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is

200 mA

540 mA

1.24 A

900 mA

[#]

Addition of resistors in parallel increases total resistance and decreases total current.

True

False

[#]

The tesla is the unit of magnetic flux.

True

False

[#]

A signal with a 400

s period has a frequency of

250 Hz

2,500 Hz

25,000 Hz

400 Hz

[#]

One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

0°

45°

40°

none of the above

[#]

A capacitor of 2,000 pF is greater than

0.02

0.002

0.0002

0.0000002 F

[#]

10.

A 320

H coil is in series with a 3.3 k

resistor. How long does it take for current to build up to its full value?

0.48 s

0.48 ms

0.48

48 s

[#]

11.

An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

good

open

shorted

partly shorted

[#]

12.

An inductor, a 1 k

resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is

0 V

6 V

12 V

4 V

[#]

13.

The permeability of a core material is an indication of the ability of the material to establish a magnetic field.

True

False

[#]

14.

Total current in an RC circuit always leads the source voltage.

True

False

[#]

15.

A filter passes certain frequencies and rejects others.

True

False

[#]

16.

Referring to Problem 8, the total current is

1.5 A

573 mA

5.73 A

1.19 A

[#]

17.

Norton's theorem gives

an equivalent current source in parallel with an equivalent impedance

an equivalent current source in series with an equivalent impedance

an equivalent voltage source in parallel with an equivalent impedance

an equivalent voltage source in series with an equivalent impedance

[#]

18.

For the circuit shown, determine Z_TH for the portion of the circuit external to R_L.

66.7

–33.7° k

6.67

–333.7° k

14.4

–56.3° k

1.44

–33.7° k

[#]

19.

To understand how the output voltage is shaped by a differentiator, you must consider

the response to the rising pulse edge

the response between the rising and falling edges

the response to the falling pulse edge

all of the above

[#]

20.

The flat portions of a pulse waveform contain low-frequency components.

True

False

[#]

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Online Electrical Engineering Test - Electrical Engineering Test - Random

Marks : 2/20

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