# Online Electrical Engineering Test - Electrical Engineering Test 1

Instruction:

• This is a FREE online test. DO NOT pay money to anyone to attend this test.
• Total number of questions : 20.
• Time alloted : 30 minutes.
• Each question carry 1 mark, no negative marks.
• DO NOT refresh the page.
• All the best :-).

1.

Materials with lots of free electrons are called

A.
 conductors
B.
 insulators
C.
 semiconductors
D.
 filters

2.

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

A.
 1.6 A
B.
 16 A
C.
 2 A
D.
 0.2 A

3.

A wiper is the sliding contact in a

A.
 switch
B.
 photoconductive cell
C.
 thermistor
D.
 potentiometer

4.

A 120 resistor must carry a maximum current of 25 mA. Its rating should be at least

A.
 4.8 W
B.
 150 mW
C.
 15 mW
D.
 480 mW

5.

Three 47 resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately

A.
 2.3 A
B.
 780 mA
C.
 47 mA
D.
 7.06 A

6.

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

A.
 4.16 V, 120
B.
 41.6 V, 120
C.
 4.16 V, 70
D.
 41.67 V, 70

7.

Referring to circuit given, if R1 is changed to a 68 resistor, what will be the current through it?

A.
 0.16 A
B.
 0.24 A
C.
 0.2 A
D.
 0.04 A

8.

A practical current source has a finite internal resistance.

A.
 True
B.
 False

9.

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

A.
 True
B.
 False

10.

What is the capacitance when Q = 60 C and V = 12 V?

A.
 720 F
B.
 5 F
C.
 50 F
D.
 12 F

11.

A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

A.
 7.3 V
B.
 73 V
C.
 88 V
D.
 880 V

12.

A transformer

A.
 changes ac to dc
B.
 changes dc to ac
C.
 steps up or down dc voltages
D.
 steps up or down ac voltages

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

A.
 increased
B.
 decreased
C.
 doubled
D.
 not a factor

14.

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

A.
 True
B.
 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, RW, is 30 . The equivalent parallel resistance, Rp(eq), is

A.
 1,878
B.
 18,780
C.
 18,750
D.
 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

A.
 125 Hz
B.
 1,250 Hz
C.
 564 Hz
D.
 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, RW, 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?

A.
 1.1 mV
B.
 11.1 mV
C.
 111 mV
D.
 200 mV

18.

Referring to the given circuit, what is VTH if VS = 120° V?

A.
 4.6938.7° V
B.
 9.3838.7° V
C.
 120° V
D.
 60° V

19.

If the capacitor in an integrator becomes leaky,

A.
 the time constant will be effectively reduced
B.
 the waveshape of the output voltage across C is altered
C.
 the amplitude of the output is reduced
D.
 all of the above

20.

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

A.
 True
B.
 False