# Electrical Iti Instructor Online Test 1

90 Questions | Total Attempts: 143  Settings  • 1.
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
• A.

2 mA

• B.

2.2 mA

• C.

214 mA

• D.

21.4 mA

• 2.
How much voltage is needed to produce 2.5 A of current through a 200  resistor?
• A.

50 V

• B.

500 V

• C.

80 V

• D.

8 V

• 3.
Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
• A.

• B.

400

• C.

4 k

• D.

4.4

• 4.
When a fourth resistor is connected in series with three resistors, the total resistance
• A.

Increases by one-fourth

• B.

Increases

• C.

Decreases

• D.

Remains the same

• 5.
The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
• A.

12 W

• B.

48 W

• C.

3 W

• D.

8 W

• 6.
Three 680  resistors are connected in series with a 470 V source. Current in the circuit is
• A.

69 mA

• B.

230 mA

• C.

23 mA

• D.

690 mA

• 7.
If a 6 V and a 9 V source are connected series aiding, the total voltage is
• A.

6 V

• B.

8 V

• C.

3 V

• D.

15 V

• 8.
A certain Wheatstone bridge has the following resistor values: R1 = 10 k, R2 = 720 , and R4 = 2.4 k. The unknown resistance is
• A.

24

• B.

2.4

• C.

300

• D.

3,000

• 9.
The branch current method uses
• A.

Kirchhoff's voltage and current laws

• B.

Thevenin's theorem and Ohm's law

• C.

Kirchhoff's current law and Ohm's law

• D.

The superposition theorem and Thevenin's theorem

• 10.
How many degrees are there in /3 rad?
• A.

• B.

60°

• C.

180°

• D.

270

• 11.
To produce an 800 Hz sine wave, a four-pole generator must be operated at
• A.

200 rps

• B.

400 rps

• C.

800 rps

• D.

1,600 rps

• 12.
If the peak of a sine wave is 13 V, the peak-to-peak value is
• A.

6.5 V

• B.

13 V

• C.

26 V

• D.

None of the above

• 13.
A signal with a 400 s period has a frequency of
• A.

250 Hz

• B.

2,500 Hz

• C.

25,000 Hz

• D.

400 Hz

• 14.
A sawtooth wave has a period of 10 ms. Its frequency is
• A.

10 Hz

• B.

50 Hz

• C.

100 Hz

• D.

1000 Hz

• 15.
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
• A.

55 mH

• B.

Less than 0.2 mH

• C.

Less than 5.5 mH

• D.

5.5 mH

• 16.
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
• A.

Good

• B.

Open

• C.

Shorted

• D.

Partly shorted

• 17.
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
• A.

1.8 mV

• B.

18 mV

• C.

180 mV

• D.

1.25 mV

• 18.
In a three-phase system, the voltages are separated by
• A.

45°

• B.

90°

• C.

120°

• D.

180°

• 19.
In a three-phase system, when the loads are perfectly balanced, the neutral current is
• A.

Zero

• B.

One-third of maximum

• C.

Two-thirds of maximum

• D.

At maximum

• 20.
In a balanced three-phase load, each phase has
• A.

An equal amount of power

• B.

One-third of total power

• C.

Two-thirds of total power

• D.

A power consumption equal to  IL

• 21.
In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
• A.

• B.

30°

• C.

60°

• D.

120°

• 22.
The most common type of ac motor is the
• A.

Single-phase induction motor

• B.

Two-phase induction motor

• C.

Three-phase induction motor

• D.

Two-phase squirrel-cage motor

• 23.
In Delta connected generator, all of the phase voltages are
• A.

Zero

• B.

Equal in magnitude

• C.

One-third of total

• D.

One-sixth of total

• 24.
Materials with lots of free electrons are called
• A.

Conductors

• B.

Insulators

• C.

Semiconductors

• D.

Filters

• 25.
The unit of electrical charge is the
• A.

Coulomb

• B.

Joule

• C.

Volt

• D.

Watt

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