Online Electrical Engineering Test - Electrical Engineering Test - Random

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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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What is (79 × 10⁶)/(12 × 10^–8)?

6,580 × 10¹²

658 × 10¹⁰

6.58 × 10¹⁴

0.658 × 10¹⁶

[#]

A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

[#]

Approximately how much current flows through a 3.3 M

resistor across a 30 V source?

900

9000

[#]

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

[#]

The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is

1 A

7 A

unknown

the larger of the two

[#]

You cannot convert a voltage source to an equivalent current source, or vice versa.

True

False

[#]

Materials with a low retentivity do not retain a magnetic field very well.

True

False

[#]

A 1 kHz signal has a period of 1 ms.

True

False

[#]

Energy is stored by a capacitor in a magnetic field.

True

False

[#]

10.

A capacitor with 150

of capacitive reactance is across an ac source. The impedance, expressed in polar form, is

Z = 150

90°

Z = 150

–90°

Z = 150

180°

[#]

11.

When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

increases

decreases

remains the same

becomes erratic

[#]

12.

Apparent power is expressed in watts.

True

False

[#]

13.

A 140

resistor is in parallel with an inductor having 60

inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is

5.51

55.15

200

[#]

14.

In an RL circuit, part of the power is resistive and part is reactive.

True

False

[#]

15.

Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.

True

False

[#]

16.

An RL high-pass filter consists of a 470

resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is

125 Hz

1,250 Hz

564 Hz

5,644 Hz

[#]

17.

A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.

True

False

[#]

18.

Referring to the given figure, determine Z_TH as seen by R_L if R₁ is changed to 3.3 k

1488

–70.7°

3859

–31.2°

5180

–50.5°

1828

–50.2°

[#]

19.

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

True

False

[#]

20.

In a Y-Y source/load configuration, the

phase current, the line current, and the load current are all equal in each phase

phase current, the line current, and the load current are 120° out of phase

phase current and the line current are in phase, and both are 120° out of phase with the load current

line current and the load current are in phase, and both are out of phase with the phase current

[#]

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