DC Circuit

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問題一覧

Which is electrical property of atom?

Charge

It is rate of change of current with respect to time.

Current

Type of current having constant polarity and magnitude over time.

Direct Current

Refers to rectangular pulses at regular or irregular intervals

Intermittent Current

Which of the following does not belong to the group?

Damping Current

It is electromotive force that pushes electron to flow

Voltage

The rate of work done with respect to charge

Voltage

Which of the following is false?

Current can exist without voltage.

It is rate of expending or absorbing energy with respect to time.

Power

The work done to move one million electrons from one point to another point is 1.6 pJ. What is the electromotive force generated?

10 V

The work done on ionized particles is 2 mJ and it generates electromotive force of 12 V. If the ionized particels move from one point to another in 10 s, how much current is produced?

2.4 A

The ability of charged particles to do work

Electric Potential Energy

What is 1 kiloWatt-hour in Btu?

3,412 Btu

Which of the following is true?

Active element generate energy and amplifies signal while passive element absorbs energy and dissipates power.

It is result of energy loss as heat

Resistance

Resistors _____ the current, and ____ voltage drop.

limit, creates

Which resistor is based on classification of adjustability of its resistance or not?

Fixed Resistor

Which refers to resistor in which a resistance whose value changes, as a result of current, producing power dissipation and heat in the resistance?

Nonlinear Resistor

Carbon Composition Resistor is made of ____ or _______ mixed with a powdered insulating material as a binder.

finely divided carbon or graphite

It refers to the thin copper leads connected to the ends of resistor end metal caps.

Axial Leads

The body color of carbon film resistors is usually _____.

tan

Metal film resistors are almost always coated with a ______ lacquer which provides electrical, mechanical, and climate protection.

blue, light green, or red

Wire Wound Resistors tend to be _____

reactive due to having coils

What is true about fusible resistors?

None of these

It is nonlinear, thermally sensitive resistor, whose resistance value changes with changes in operating temperature.

Thermistor

Thermistors are normally rated by the value of their resistance at a reference temperature of ______.

25°C

The color coding is standardized by the _____

EIA

Resistance under 10 ohm, has third color stripe of either _____.

gold or silver

The amount by which the actual resistance can differ from the color-coded value.

Tolerance

It is designed as point to point connector in small printed circuit board.

Zero Ohm Resistor

Which of the following is false?

The physical size of resistor is inversely proportional to its power rating.

Typically, power rating of resistors, above _______ will start to derate.

70°C

The maximum allowable voltage that a resistor can safely withstand without internal arcing.

Maximum Voltage Rating

Most common trouble in resistors is _____

open resistor

Ideally, the power dissipation in a resistor should never be more than ____ of its power rating.

50%

A dirty resistive element can be cleaned ____

using special contact cleaner

A wire has specific cross sectional area and length. if the length doubles while cross sectional area triples, how much resistance is changed?

2/3

Which of the following has highest resistivity?

Aluminum

Which of the following has lowest resistivity?

Pure annealed copper

Which conductor is the most ductile due to its ability to be easily drawn?

Gold

Which of the following is true?

Negative Temperature Coefficient refers to resistance decreases as temperature increases and Positive Temperature Coefficient refers to resistance increases as temperature increases.

What property of alloy in which it is not affected by factors such as temperature?

Zero Temperature Coefficient

It is alloy used in heating element, and it consists of 80 percent Nickel and 20 percent Chromium.

Nichrome

It is used in alloy used in rheostat and thermocouple, and consists of 55 percent Copper, and 45 percent Nickel

Constantan

It is used in Shunt Resistor that consists of 84 percent Copper, 12 percent Manganese, and 4 percent Nickel

Manganin

______ refers to series combination of resistors

String

______ refers to parallel combination of resistors

Bank

Which of the following is true?

As wire gauge increases, the diameter increases and resistance decreases.

If a wire has rating of 400 CMil/A, what is the AWG size of wire if it is used on 12 Ampere rating?

#13

It occurs in superconductive state, in which, electrons travel in pairs and help each other maintain a significantly higher velocity through the medium.

Cooper Effect

Critical Temperature refers to temperature, in which, ________ becomes ______.

superconductor, conductor

In a parallel circuit, when there is shorted path, current increases, thus ______

fuse blows up, thus cutting off current, leading to zero voltage and resistance.

In a parallel circuit, when there is open path, ______

voltage across the open path is same.

Voltage drop across good fuse and switch is _____.

zero

In series parallel circuit, individual power dissipations, is determined by _____.

individual parameters

Electrical appliances are connectied in parallel, instead of series, due to ______.

different current rating

Wheatstone Bridge is a circuit, having _____ input terminals, and _____ output terminals, in a diamond shape.

two, two

______ circuit has no current flow in the middle due to voltages ratios, are equal and consists of two series strings, in parallel.

Balanced Bridge

It refers to the current wasted, flowing through loaded voltage divider specifically, resistor parallel to load resistor

Bleeder Current

It is sudden involuntary contraction of the muscles with a feeling of pain, caused by, current through the body.

Electric Shock

What can reduce human body resistance when experiencing electric shock?

Holding the conductors tighter

As little as _____ through the body can cause an electric shock, and threshold of sensation, can be felt.

1 mA

Slightly above ______, pain threshold increases and makes the person unable to free oneself from the circuit.

10 mA

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