Online Electrical Engineering Test - Electrical Engineering Test 2

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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 quantity 3.3 × 10³ is the same as

330

3,300

33,000

0.0033

[#]

When converting 7,000 nA to microamperes, the result is

0.007 µA

0.7 µA

700 µA

7 µA

[#]

An ohmmeter is an instrument for measuring

current

voltage

resistance

wattage

[#]

An open circuit is one that has a complete current path.

True

False

[#]

An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

385

38.5

3.1

[#]

If a 24 V and a 6 V battery are series opposing, the total voltage is

30 V

24 V

18 V

0 V

[#]

Norton's equivalent current (I_N) is an open-circuit current between two points in a circuit.

True

False

[#]

The angular position of a phasor represents the angle of the sine wave with respect to a reference.

True

False

[#]

A 0.01

F capacitor equals how many picofarads?

100 pF

1,000 pF

10,000 pF

100,000 pF

[#]

10.

Inductance is the property of an inductor that produces an opposition to any change in current.

True

False

[#]

11.

An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

R = X_C

R > X_C

R < X_C

R = 5X_C

[#]

12.

An imaginary number is one that exists only in the mind of the mathematician.

True

False

[#]

13.

Referring to Problem 23, the true power is

68.6 mW

686 mW

564 mW

121.8 mW

[#]

14.

In a certain series resonant circuit, V_C = 125 V, V_L = 125 V, and V_R = 40 V. The value of the source voltage is

125 V

250 V

290 V

40 V

[#]

15.

In applying the superposition theorem,

the sources are considered one at a time with all others replaced by their internal impedance

all sources are considered independently

all sources are considered simultaneously

the sources are considered one at a time with all others replaced by their internal resistance

[#]

16.

Referring to the given circuit, find Z_TH for the part of the circuit that is external to R_L.

129

21.4°

43.7

68.6°

43.7

21.4°

12.9

68.6°

[#]

17.

In order to get maximum power transfer from a capacitive source, the load must

have a capacitive reactance equal to circuit resistance

have an impedance that is the complex conjugate of the source impedance

be as capacitive as it is inductive

none of the above

[#]

18.

In an electric circuit, the reaction of a circuit to a given pulse input is known as the pulse response.

True

False

[#]

19.

In a

-connected generator, all of the phase voltages are

zero

equal in magnitude

one-third of total

one-sixth of total

[#]

20.

A three-phase

-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I θ_a = 12

30° A, what are the polar expressions for the other phase currents?

I _θb = 12

150° A, I _θc = 12

–90° A

I _θb = 12

120° A, I _θc = 12

30° A

I _θb = 12

30° A, I _θc = 12

120° A

I _θb = 12

90° A, I _θc = 12

90° A

[#]

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Online Electrical Engineering Test - Electrical Engineering Test 2

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