Electrical Engineering Test 4 - Online Electrical Engineering Test

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

3 × 10⁸

30 × 10⁸

300 × 10⁹

3,000 × 10⁷

[#]

A circuit breaker is a

fuse

switch

resettable protective device

resistor

[#]

A material that does not allow current under normal conditions is a(n)

insulator

conductor

semiconductor

valence

[#]

A current of 200 µA through a 6.8 k

resistor produces a voltage drop of

34.4 V

340 V

13.6 V

1.36 V

[#]

A 6 V battery is connected to a 300

load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?

1 h

200 h

2,000 h

10 h

[#]

A 68

resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is

132 mW

13.2 mW

22.6 mW

226 mW

[#]

The unit for reluctance is

tesla

At/Wb

At/m

[#]

The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

40 Hz

100 Hz

400 Hz

indeterminable

[#]

In Question 6, the capacitor will reach full charge in a time equal to approximately

6 RC

5 RC

none of the above

[#]

10.

A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased

V_R > V_C

V_C > V_R

V_R = V_C

V_R and V_C = 0

[#]

11.

When the current through an inductor decreases, the amount of energy stored in the electromagnetic field

increases

decreases

remains the same

doubles

[#]

12.

How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

9 V

90 V

900 V

0.9 V

[#]

13.

Referring to Problem 21, what is the phase angle for the circuit?

7.1°

71.5°

1.8°

18.4°

[#]

14.

A 470

resistor and a 0.2

F capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is

212

2.12 mS + j3.14 mS

3.14 mS + j2.12 mS

318.3

[#]

15.

The polar form of a complex number consists of a real part and a j part.

True

False

[#]

16.

A 470

resistor and a coil with 125

inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is

152 mA

32 mA

12 mA

120 mA

[#]

17.

The power factor indicates how much of the apparent power is reactive power.

True

False

[#]

18.

Referring to Problem 12, the voltage across the capacitor is

7.8 V

780 mV

5.4 V

540 V

[#]

19.

Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60

2.73 V

27.33 V

30 V

2.67 V

[#]

20.

Referring to Problem 3, power consumption is

16 W

160 mW

160 W

3,459 W

[#]

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Online Electrical Engineering Test - Electrical Engineering Test 4

Marks : 2/20

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