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 with an atomic number of five has how many electrons?

none

depends on the type of atom

[#]

You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?

9 V

900 mV

0 V

18 V

[#]

The formula for finding voltage when resistance and current are known is V = I/R.

True

False

[#]

For 12 V and 40 mA, the power is

480 mW

0.480 W

480,000 µW

all of the above

[#]

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

True

False

[#]

Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is

60 mA

15 mA

135 mA

31.25 mA

[#]

The parallel combination of a 6.8 k

resistor and a 10 k

resistor is in series with the parallel combination of a 2.2 k

resistor and a 1 k

resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)

6.8 k

2.2 k

6.8 k

and 10 k

2.2 k

and 1 k

[#]

A 680

load resistor, R_L, is connected across a constant current source of 1.2 A. The internal source resistance, R_S, is 12 k

. The load current, R_L, is

0 A

1.2 A

114 mA

1.14 A

[#]

Determine I_N for the circuit consisting of V_S, R₁, R₂, and R₃ shown in the given circuit.

676 mA

245 mA

431 mA

75 mA

[#]

10.

Referring to the given circuit, the voltage and current for the load resistor, R_L, is

450 mV, 4.5 mA

4.50 V, 45 mA

4.50 V, 4.5 mA

450 mV, 45 mA

[#]

11.

Ampere-turn is the unit of magnetomotive force (mmf).

True

False

[#]

12.

A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

0.0045 s

2 ms

1.5 ms

3,000

[#]

13.

A 0.47

F capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is

170

0.000169

1.7

[#]

14.

The ohm is the unit of capacitance.

True

False

[#]

15.

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

[#]

16.

In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.

True

False

[#]

17.

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

[#]

18.

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

increases

decreases

remains constant

is not a factor

[#]

19.

The resistor voltage in an RL circuit is always out of phase with the current.

True

False

[#]

20.

In an RC differentiator, responding to repetitive pulses, the average value of the output

is zero

is equal to the input voltage

is 63 percent of the input voltage

cannot be determined

[#]

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