Online Electrical Engineering Test - Electrical Engineering Test 1

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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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Materials with lots of free electrons are called

conductors

insulators

semiconductors

filters

[#]

A wiper is the sliding contact in a

switch

photoconductive cell

thermistor

potentiometer

[#]

Eight-tenths coulomb passes a point in 4 s. The current in amperes is

1.6 A

16 A

2 A

0.2 A

[#]

A 120

resistor must carry a maximum current of 25 mA. Its rating should be at least

4.8 W

150 mW

15 mW

480 mW

[#]

Three 47

resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately

2.3 A

780 mA

47 mA

7.06 A

[#]

Referring to circuit given, if R₁ is changed to a 68

resistor, what will be the current through it?

0.16 A

0.24 A

0.2 A

0.04 A

[#]

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

[#]

A practical current source has a finite internal resistance.

True

False

[#]

The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

True

False

[#]

10.

What is the capacitance when Q = 60

C and V = 12 V?

720

[#]

11.

A transformer

changes ac to dc

changes dc to ac

steps up or down dc voltages

steps up or down ac voltages

[#]

12.

A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, R_L, is 120

. What is the approximate voltage across the load?

7.3 V

73 V

88 V

880 V

[#]

13.

The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is

increased

decreased

doubled

not a factor

[#]

14.

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

True

False

[#]

15.

A 6.8 k

resistor, a 7 mH coil, and a 0.02

F capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, R_W, is 30

. The equivalent parallel resistance, R_p(eq), is

1,878

18,780

18,750

626

[#]

16.

An RL high-pass filter consists of a 470

resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is

125 Hz

1,250 Hz

564 Hz

5,644 Hz

[#]

17.

A series resonant band-stop filter consists of a 68

resistor, a 110 mH coil, and a 0.02

F capacitor. The internal resistance, R_W, of the coil is 4

. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f₀?

1.1 mV

11.1 mV

111 mV

200 mV

[#]

18.

Referring to the given circuit, what is V_TH if V_S = 12

0° V?

4.69

38.7° V

9.38

38.7° V

0° V

[#]

19.

If the capacitor in an integrator becomes leaky,

the time constant will be effectively reduced

the waveshape of the output voltage across C is altered

the amplitude of the output is reduced

all of the above

[#]

20.

The rising and falling edges of a pulse waveform contain the higher frequency component.

True

False

[#]

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Online Electrical Engineering Test - Electrical Engineering Test 1

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