Online Electrical Engineering Test - Electrical Engineering Test 7

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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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The number 65,000 expressed in scientific notation as a number between 1 and 10 times a power of ten is

0.65 × 10⁴

6.5 × 10⁴

65 × 10⁴

650 × 10³

[#]

Current flows in a circuit when

a switch is opened

a switch is closed

the switch is either open or closed

there is no voltage

[#]

A potentiometer is a two-terminal variable resistor.

True

False

[#]

Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately

2.2 A

137 mA

1.8 A

9.09 A

[#]

A certain Wheatstone bridge has the following resistor values: R₁ = 10 k

, R₂ = 720

, and R₄ = 2.4 k

. The unknown resistance is

2.4

300

3,000

[#]

An ideal current source has zero internal resistance.

True

False

[#]

Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.

True

False

[#]

The voltage induced across a certain coil is 200 mV. A 120

resistor is connected to the coil terminals. The induced current is

1.7 mA

16 mA

12 mA

120 mA

[#]

A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

25 kHz

12 kHz

18 kHz

1.3 MHz

[#]

10.

Referring to Problem 23, what is the circuit impedance, Z?

264

–55.9°

264

–34°

2.64

–55.9°

2.64

–34°

[#]

11.

Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.

True

False

[#]

12.

A 47

resistor is in series with an inductive reactance of 120

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

68.6°

120

68.6°

129

31.4°

129

68.6°

[#]

13.

Total current in an RL circuit always lags the source voltage.

True

False

[#]

14.

The impedance of an RL circuit varies inversely with frequency.

True

False

[#]

15.

If the value of C in a series RLC circuit is decreased, the resonant frequency

is not affected

increases

is reduced to zero

decreases

[#]

16.

Referring to Problem 8, the total current is

1.5 A

573 mA

5.73 A

1.19 A

[#]

17.

Referring to Problem 10, the total current is

5.3 mA

4.6 A

4.6 mA

31 mA

[#]

18.

The roll-off rate of a basic RC or RL filter is 20 dB per decade.

True

False

[#]

19.

If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant

is zero

is the sum of the two currents

is the difference between the two currents

cannot be determined

[#]

20.

In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is

3 A

6 A

9 A

27 A

[#]

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Online Electrical Engineering Test - Electrical Engineering Test 7

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