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زمان تکمیل این آزمون 25 دقیقه میباشد

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شماره موبایل خود را وارد کنید *

تایید

How many of these sentences are true?

Neutrons have positive and negative electrical charges.

Voltage that varies periodically with time is called an DC voltage.

Electrons flow from the negative (-ve) terminal to the positive (+ve) terminal of the supply.

We decrease the resistance the current goes up.

For ease of circuit understanding conventional current flow assumes that the current flows from the negative to the positive terminal.

Current is measured in Amps and an amp or ampere is defined as the number of protons.

(0.5 نمره)

تایید

……….. is the potential energy of an electric supply stored in a form of an electrical charge. (0.5 نمره)

Power

Voltage

Current

Resistant

تایید

Which port of multimeter is “low/negative connection for circuit measurements”? (0.5 نمره)

com

تایید

If transformer voltage ratings specified as 120×240 in nameplate means: (0.5 نمره)

The primary winding is rated 120 v and the secondary is rated 240 v.

A 240 v windings with a center tap.

The transformer can operate at 120 v or 240 v but not both simultaneously.

The primary winding is rated 240 v and the secondary is rated 120 v.

تایید

Connect a multimeter in ……... to measure the current flow through a lightbulb. (0.5 نمره)

Connected

Disconnected

Parallel

Series

تایید

what is the Persian equivalent of data display in multimeter? (0.5 نمره)

صفحه نمایش

کلید سلکتور

حافظه اطلاعات

کلید روشن و خاموش

تایید

Connect a multimeter in ……… to measure the voltage drop across a lightbulb. (0.5 نمره)

Series

Parallel

Disconnected

Connected

تایید

A device which stores electricity when an operation is in progress. (0.5 نمره)

Resistance

Capacitor

Diode

Transistor

تایید

3 mega ohms means: (0.5 نمره)

Three millionth ohms

Three thousandth ohms

Three million ohms

Three thousand ohms

تایید

A region of space near a magnet, electric current or moving charge particle in which a magnetic force acts on any other magnet, electric current, or moving charge particle. (0.5 نمره)

Magnetic field

Magnetic flux

Magnetic core

Winding

تایید

Which is correct? (0.5 نمره)

The flow of electrons around the circuit is same direction of conventional current flow.

The actual current flowing in an electrical circuit is composed of electrons from negative pole of battery to the positive pole of battery.

The conventional current flow is from negative pole of battery to the positive pole of battery.

Both a and b

تایید

A transformer consist of an iron core, with …… . (0.5 نمره)

Two wirings

Two windings

One wiring

One winding

تایید

A multimeter shows two hundred thousandth ampere as ……. (0.5 نمره)

200 mA

20 mA

200 A

2000 A

تایید

How many of these sentences are true?

Just DC generators use Faraday’s principle of induction.

In DC voltage, the positive pole always has a positive voltage with respect to the negative pole.

AC voltage takes the form of sine wave.

When the conductor moves through a magnetic field, voltage is induced.

(0.5 نمره)

تایید

A step up transformer changes ……….. (0.5 نمره)

High voltage to low voltage

Low current to high current

Low voltage to high voltage

a and b

تایید

1 micro ampere means: (0.5 نمره)

One millionth ampere

One thousandth ampere

One million ampere

One thousand ampere

تایید

Which of the following has not semiconductor in it’s structure? (0.5 نمره)

Diode

Transistor

IGBT

Inductor

تایید

Electrons have ……….. electrical charge and protons have ……. Electrical charge. (0.5 نمره)

Positive – Negative

Negative – Positive

Negative – No

No – Positive

تایید

A transformer can change high …….. to low …….. but the ……… remain unchanged. (0.5 نمره)

Frequency- Frequency-Voltage

Voltage-Voltage-Current

Frequency- Frequency-Current

Voltage-Voltage-Frequency

تایید

The fundamental relationship between voltage, current and resistant in an electrical circuit is called ……….... (0.5 نمره)

Len’s law

Voltage’s law

Ohm’s law

Faraday’s law

تایید

A passive two terminal electrical component that stores electrical energy in a magnetic field when electric current flows through it. (0.5 نمره)

Resistance

Capacitor

Inductor

Eclectic motor

تایید

Flow of electrons in a circuit is called ………. . (0.5 نمره)

Electrical voltage

Electrical power

Electrical current

Electrical resistance

تایید