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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When these numbers are multiplied, (6 × 10³) (5 × 10⁵), the result is

3 × 10⁸

30 × 10⁸

300 × 10⁹

3,000 × 10⁷

[#]

A thermistor is a type of

switch

resistor

battery

power supply

[#]

Four amperes of current are measured through a 24

resistor connected across a voltage source. How much voltage does the source produce?

960 V

9.6 V

96 V

8 V

[#]

Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k

of resistance?

27.2 mA

59 mA

5.9 mA

590 mA

[#]

If you used 600 W of power for 60 h, you have used

36 kWh

3.6 kWh

10 kWh

1 kWh

[#]

Find the Thevenin equivalent (V_TH and R_TH) between terminals A and B of the circuit given below.

4.16 V, 120

41.6 V, 120

4.16 V, 70

41.67 V, 70

[#]

When assigning branch currents, you need not be concerned with the direction you choose.

True

False

[#]

A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

4 V

4.6 V

1.6 V

11 V

[#]

In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

one-fourth the primary current

four times the primary current

equal to the primary current

one-fourth the primary current and equal to the primary current

[#]

10.

The primary is the winding connected to the source, and the secondary is the winding connected to the load.

True

False

[#]

11.

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

[#]

12.

In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

200 mA

100 mA

282 mA

141 mA

[#]

13.

When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

increases

decreases

does not change

decreases to zero

[#]

14.

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

[#]

15.

The impedance of a series RC circuit varies directly with frequency.

True

False

[#]

16.

Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.

True

False

[#]

17.

When a 12 V input pulse with a width equal to one time constant is applied to an RC integrator, the capacitor charges to

0 V

12 V

6.3 V

7.56 V

[#]

18.

When a 15 V input pulse with a width equal to two time constants is applied to an RC integrator, the capacitor charges to

15 V

12.9 V

8.6 V

19.45 V

[#]

19.

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

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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