Online Electrical Engineering Test - Electrical Engineering Test 6

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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 two-terminal variable resistor is known as a

potentiometer

thermistor

rheostat

wiper

[#]

If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

220 k

22 k

2.2 k

220

[#]

How many watt-hours represent 65 W used for 18 h?

11.7 Wh

1,170 Wh

11,700 Wh

117,000 Wh

[#]

If a 6 V and a 9 V source are connected series aiding, the total voltage is

6 V

9 V

3 V

15 V

[#]

The total resistance of a circuit is 680

. The percentage of the total voltage appearing across a 47

resistor that makes up part of the total series resistance is

68%

47%

69%

6.91%

[#]

The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage

decreases

increases

remains the same

becomes zero

[#]

The higher the range setting, the less the internal resistance and the greater the load effect of the voltmeter on a circuit.

True

False

[#]

Find the current through R₂ of the given circuit.

30.7 mA

104 mA

74 mA

134 mA

[#]

Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

Wave A leads wave B by 15°.

Wave A lags wave B by 15°.

Wave A leads wave B by 105°.

Wave A lags wave B by 105°.

[#]

10.

An 18 V power supply is connected across a coil with a winding resistance of 180

. Current flow in the coil is

1 mA

10 mA

100 mA

1 A

[#]

11.

An induced voltage is produced as a result of a dc voltage.

True

False

[#]

12.

The permeability of a core material is an indication of the ability of the material to establish a magnetic field.

True

False

[#]

13.

The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, R_L, is 100

. The voltage across the load is

0 V

6 V

18 V

2 V

[#]

14.

What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

4 kVA

0.25 kVA

16 kVA

8 kVA

[#]

15.

Total current in an RC circuit always leads the source voltage.

True

False

[#]

16.

A 1.2 k

resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

152.6

1,526

1,200

942

[#]

17.

In a series RLC circuit, the larger reactance determines the net reactance of the circuit.

True

False

[#]

18.

The reactive voltages, V_L and V_C, cancel at resonance.

True

False

[#]

19.

The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is

0 V

15 V

10.60 V

21.21 V

[#]

20.

An RC high-pass filter consists of an 820

resistor. What is the value of C so that X_c is ten times less than R at an input frequency of 12 kHz?

161

0.161

220

[#]

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Online Electrical Engineering Test - Electrical Engineering Test 6

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