Electrical Engineering Test 3 - Online Electrical Engineering Test

Instruction:

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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 resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

2 mA

2.2 mA

214 mA

21.4 mA

[#]

What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

9.7

230

[#]

The watt is the unit of power.

True

False

[#]

Total power in a parallel circuit is found by adding up the power of all the individual resistors.

True

False

[#]

The number of current paths equals the number of resistors in parallel.

True

False

[#]

The first row of a certain determinant has the numbers 3 and 5. The second row has the numbers 7 and 2. The value of this determinant is

–31

–29

[#]

What is the voltage drop across R₂?

3.5 V

4.18 V

1.5 V

145 mV

[#]

An electromagnetic field exists only when there is

an increasing current

decreasing current

voltage

current

[#]

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

increases

decreases

remains constant

reaches zero

[#]

10.

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

[#]

11.

The average value of a 12 V peak sine wave over one complete cycle is

0 V

1.27 V

7.64 V

6.37 V

[#]

12.

Amplitude is the maximum value of a voltage or current.

True

False

[#]

13.

When the frequency is decreased, the impedance of a parallel RL circuit

increases

decreases

remains constant

is not a factor

[#]

14.

Determine V_TH if R₁ is changed to 3.3 k

0.574

16.7° V

4.63

16.7° V

4.63

39.5° V

0.463

39.5° V

[#]

15.

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°

[#]

16.

One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.

True

False

[#]

17.

In an RC differentiator, the capacitor

charges exponentially at a rate depending on the RC time constant

charges exponentially at a rate depending on the input voltage

charges when the input voltage is decreasing

charges to approximately one time constant

[#]

18.

If in a Y-connected ac generator, each phase voltage has a magnitude of 90 V_RMS, what is the magnitude of each line voltage?

0 V

90 V

156 V

180 V

[#]

19.

A simple three-phase generator consists of three conductive loops separated by 120°.

True

False

[#]

20.

The stator is the rotating assembly in a generator or motor.

True

False

[#]

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Online Electrical Engineering Test - Electrical Engineering Test 3

Marks : 2/20

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