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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A neutral atom is one with an equal number of protons and electrons.

True

False

[#]

How much voltage is needed to produce 2.5 A of current through a 200

resistor?

50 V

500 V

80 V

8 V

[#]

A half-watt is equal to how many milliwatts?

5,000 mW

5 mW

500 mW

50 mW

[#]

The total resistance of a series circuit is equal to the difference between the largest and smallest value resistors.

True

False

[#]

Two 3.3 k

resistors are in series and this series combination is in parallel with a 4.7 k

resistor. The voltage across one of the 3.3 k

resistors is 12 V. The voltage across the 4.7 k

resistor is

24 V

12 V

0 V

6 V

[#]

The Thevenin equivalent voltage (V_TH) is the short-circuit voltage between two terminals in a circuit.

True

False

[#]

Find branch current IR₂.

5.4 mA

–5.4 mA

113.0 mA

119.6 mA

[#]

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

[#]

If the peak of a sine wave is 13 V, the peak-to-peak value is

6.5 V

13 V

26 V

none of the above

[#]

10.

Total parallel capacitance is less than that of the smallest capacitor in parallel.

True

False

[#]

11.

The winding resistance of a coil can be increased by

increasing the number of turns

using a thinner wire

changing the core material

increasing the number of turns or using thinner wire

[#]

12.

When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

0 V

6 V

48 V

0.75 V

[#]

13.

If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

25 W

0 W

250 W

2.5 W

[#]

14.

A 2 k

resistor and a 0.002

F capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

84.5 mW

845 mW

13 mW

130 mW

[#]

15.

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

increases

decreases

remains the same

becomes erratic

[#]

16.

V_out = 500 mV, and V_in = 1.3 V. The ratio V_out/ V_in expressed in dB is

0 dB

8.30 dB

–8.30 dB

0.8 dB

[#]

17.

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

[#]

18.

Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.

True

False

[#]

19.

A dc component is the peak value of a pulse waveform.

True

False

[#]

20.

In a Y-connected source feeding a

-connected load,

each phase of the load has one-third of the full line voltage across it

each phase of the load has two-thirds of the full line voltage across it

each phase of the load has the full line voltage across it

each phase of the load has a voltage across it equal to

[#]

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