DC CIRCUITS

What happens to the resistance of a conductor wire when its temperature is lowered? A. Decreased B. Steady C. Zero D. Increased

A. Decreased

______ has a unit of electron volt A. Energy B. Potential difference C. Current D. Charge

A. Energy

Current is simply _____. A. Flow of electrons B. Flow of protons C. Radiation D. Emission

A. Flow of electrons

Which of the following can be used to measure small dc generated voltages? A. Galvanometer B. Thermocouple C. Pyrometer D. Voltmeter

A. Galvanometer

It was experimentally found by James Prescott Joule that the heat produced in a current carrying conductor is proportional to A. I^2 B. I C. R^2 D. 1/time

A. I^2

What is the heating process makes use of the currents induced by the electromagnetic action in the charge to be heated, usèd for hardening of steel. A. Induction heating B. Convection C. Dielectric heating D. Infrared heating

A. Induction heating

_____ is the term used to express the amount of electrical energy in an electrostatic field. A. Joule B. Coulomb C. Volt D. Watt

A. Joule

*The resistance of resistor 1 is twice of resistor 2. The two are connected in SERIES and a potential difference is maintained across the combination. What is the rate of thermal energy generation in resistor 1? A. Twice that in resistor 2 B. Half that in resistor 2 C. Four times that in resistor 2 D. The same as that in resistor 2

A. Twice that in resistor 2

Electric charge of neutron is the same as ______. A. atom B. electron C. current D. proton

A. atom

*Two wires of the same material have the same lengths but different diameters. They are connected in SERIES to a battery. Which of the following quantity is the same for the two wires? A. current B. end-to-end potential difference C. voltage D current density

A. current

Resulting effect when electron is made to move A. dynamic electricity B. static electricity C. lines of force D. magnetic lines

A. dynamic electricity

The ability to do work A. energy B. kinetic C. potential D. voltage

A. energy

In electromagnetic induction three of the following terms are identical. Name the ONE that is NOT A. flux B. Maxwell per sq cm. C. lines per sq. cm D. Gauss

A. flux

The lightest kind of atom or element A. hydrogen B. helium C. titanium D. oxygen

A. hydrogen

What will happen to an insulating medium with voltage more than breakdown voltage is applied? A. it will get punctured B. it will become magnetic C. it will melt D. its molecular structure will change

A. it will get punctured

In order to have a good conductor material, such material shall have _____ valence electrons. A. one B. five C. more than ten D. twenty one

A. one

What is a symbol that represents a quantity or a single object? A. unit B. number C. item D. base

A. unit

Electric power refers to _____ A. volt ampere B. watt second C. volt coulomb D. joule

A. volt ampere

Determine the equivalent work of 166 watt-second. A. 10 joules B. 100 joules C. 16.6 joules D. 166 joules

B. 100 joules

Ten micro-microfarads is equivalent to _____ A. 100 picofarads B. 100 nanofarad C. 1000 milli microfarad D. 10.0 picofarads

B. 100 nanofarad

What is the size in square millimeter is the cable 250-MCM size? A. 118.656 B. 126.675 C. 112.565 D. 132.348

B. 126.675

The maximum number of electrons that can be accommodated in the last orbit is ____. A. 4 B. 8 C. 18 D. 2

B. 8

Which type of variable resistor should you use for controlling large amount of current? A. Potentiometer B. Adjustable wirewound C. Variac D. Rheostat

B. Adjustable wirewound

Which of the following statements is TRUE? A. An ideal current source cannot be in parallel with a short circuit. B. An ideal voltage source can be in parallel with an open circuit. C. An ideal current source can be in series with an open circuit D. An ideal voltage source cannot be in series with an ideal current source.

B. An ideal voltage source can be in parallel with an open circuit.

A car battery is rated at 80 amp-hr. An ampere-hour is a unit of A. Power B. Charge C. Energy D. Current

B. Charge

One of the following is the best conductor of electricity. A. Air B. Copper C. Carbon D. Silicon

B. Copper

Which of the following will the effect of the electric shock in the human body depends on A Voltage flowing in the body B. Current flowing in the body C. Line Power D. Resistance in the line

B. Current flowing in the body

Permittivity is expressed in __________ A. Farad/sq-m B. Farad/meter C. Weber/meter D. dimensionless

B. Farad/meter

Out of the following, select the best conductor of electricity? A. Polyethylene B. Graphite C. China Clay D. Ceramic

B. Graphite

Which of the following statements is TRUE for steady-state conditions in a circuit powered by a dry cell? A. Voltage is dependent upon time B. Inductors behave as short circuit C Capacitors behave as short circuit D. Resistors behave as open circuits

B. Inductors behave as short circuit

The direction of induced e.m.f can be found by A. Laplace's law B. Lenz's law C. Fleming's right-hand rule D. Kirchhoff's voltage law

B. Lenz's law

Which of the following conductors has the highest resistance? A. Manganin B. Nichrome C. Constantan D. Steel

B. Nichrome

If an electrical network having one or more voltage source, is transformed into equivalent electrical network with single voltage source (which is short circuit current of previous circuit) with parallel Internal resistance of the network with all current source replaced by their internal resistance. The above illustration is called A. Thévenin's Theorem B. Norton's Theorem C. Superposition Theorem D. Compensation Theorem

B. Norton's Theorem

A variable resistor normally used as a voltage divider A. Carbon film resistor B. Potentiometer C. Adjustable resistor D. Metal film resistor

B. Potentiometer

Rust in electrical (wire) connections will result to _____ A. Conductance B. Resistance C. Voltage D. Inductance

B. Resistance

What does the second strip of an electronic resistor color code represent? A. Tolerance B. Second digit of the value C. Temperature D. Multiplier

B. Second digit of the value

What is the watt-hour efficiency of storage battery? A. AH output over WH input in recharge B. WH output based on WH input in recharge C. WH output based on AH input in recharge D. AH output based on AH output in recharge

B. WH output based on WH input in recharge

Represents the current flow produced by one volt working across one ohm of resistance. A. resistance B. ampere C. voltage D. electromotive force

B. ampere

What is the basic unit for measuring current flow? A. coulomb B. ampere C. volt D. atomic weight

B. ampere

What composes all matter whether a liquid, solid or gas? A. electrons B. atoms C. protons D. neutrons

B. atoms

What will happen to an atom if an electron is either taken out or taken into the same atom? A. becomes a negative ion B. becomes an ion C. becomes a positive ion D. nothing will happen

B. becomes an ion

A resistor which is used to draw a fixed amount of current A. potentiometer B. bleeder resistor C. fixed resistor D. rheostat

B. bleeder resistor

A chemical combination of elements can be separated by chemical means but not by physical means. It is created by chemically combining two or more elements. A. molecules B. compound C. matter D. mixture

B. compound

What do you call the element that conducts electricity very readily? A. semi-conductors B. conductors C. insulators D. dielectric

B. conductors

In American wire gauge (AWG) as the number gage increase the wire diameter? A. increase B. decrease C. does not change D. does change

B. decrease

A substance or material having relative permeability of less than unity is classified as: A. ferro-magnetic B. dia-magnetic C. para-magnetic D none of these

B. dia-magnetic

A substance whose molecules consist of the same kind of atoms is called ______. A. mixture B. element C. compound D. none of these

B. element

The presence of electric current is only made known by the effect it produces. Three important effects are: A. heating, electric shock & generation B. heating, magnetic & electric shock C. generation, chemical & electric shock D. heating, magnetic & chemical

B. heating, magnetic & electric shock

What is the resistance of an open fuse circuit? A. at least 1000 ohms B. infinity C. zero D. 100 ohms at standard temperature

B. infinity

The unit of relative permeability is A. henry/meter B. it is dimensionless C. weber/sq.m D. henry

B. it is dimensionless

22. Superposition theorem can be applied only to circuits having A. resistive elements B. linear bilateral elements C. non-linear elements D. passive elements

B. linear bilateral elements

An emf induced by the changing of current in the neighboring coil is called: A. speed B. mutually induced C. self-induced D. series

B. mutually induced

Term used in electronic measuring device when a metal increases resistance due to heat produced by current flowing through them. A. positive resistance coefficient B. positive temperature coefficient C. negative temperature coefficient D. negative resistance coefficient

B. positive temperature coefficient

An insulating element or material has capability of _____. A. storing voltage B. preventing short circuit between two conducting wires C. conducting large current D. storing high current

B. preventing short circuit between two conducting wires

"In any linear bilateral network, if a source of emf E in any branch produces a current / in any other branch, then same emf acting in second branch would produce the same current / in the first branch". The above statement is associated with. A. compensation theorem B. reciprocity theorem C. superposition theorem D. Millman's theorem

B. reciprocity theorem

The coulomb force, F, acts on two charges a distance , r, apart. What is F proportional to? A. r B. r2 C. 1/r^2 D. 1/r^3

C. 1/r^2

What is the basis for declaring the direction of electric current is from positive terminal to negative terminal of a circuit? A Scientific B. Superposition C. Conventional D. Tradition

C. Conventional

_____ is anything that has weight had occupies space. It may be solid, liquid or gas. A. Amalgam B. Alloy C. Matter D. Compound

C. Matter

In Flemming's Right Hand Rule, which finger point the direction of current? A. Thumb B. Index C. Middle D. Ring

C. Middle

The area of a conductor whose diameter is 0.001 inch is equal to A. One micron B. One angstrom C. One circular mil D. One steradian

C. One circular mil

A three-terminal resistor with one or more sliding contacts which functions as an adjustable voltage divider A. Rheostat B. Bleeder resistor C. Potentiometer D. Voltage divider

C. Potentiometer

Find the lowest resistance value of the following resistors. A. White, black, black B. Violet, gray, yellow, silver C. Red, black, gold D. Gray, gray, black

C. Red, black, gold

Over charging of lead-acid battery is likely to result in A. Chlorination B. Sulfation C. Sedimentation D. Calcination

C. Sedimentation

Which of the following statement is correct? A. Potentiometer has two terminals B. Transistor has two terminals C. Typical power rating of a carbon-composition resistor ranged from 0.125 W to 2 W D. Open resistor has small resistance

C. Typical power rating of a carbon-composition resistor ranged from 0.125 W to 2 W

The mass of a proton is ____ the mass of an electron. A. equal to B. less than C. about 1837 times D. 200 times

C. about 1837 times

The unit of magnetic dipole moment are A. ampere/meter2 B. ampere-meter C. ampere-meter^2 D. ampere/meter

C. ampere-meter^2

Which of the following materials has the highest value of dielectric constant? A. glass B. vacuum C. ceramics D. oil

C. ceramics

Permeabitty in a magnetic circuit corresponds to _________ in an electric circuit A. resistance B. resistivity C. conductivity D. conductance

C. conductivity

Which material has more free electrons? A. mica B. insulator C. conductor D. dielectric

C. conductor

Kirchoff's law is not applicable to circuit with A. lumped parameters B. passive elements C. distributed parameters D. non-linear resistances

C. distributed parameters

The motion of charged particles especially colloidal particles through a relative stationary liquid under the influence of an applied electric provided. A. hysteresis B. electrolysis C. electrophoresis D. electro analysis

C. electrophoresis

The energy in an electron that is called the energy of motion A. electromotive force B. kinematics C. kinetic energy D. potential energy

C. kinetic energy

The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field "B" is ______. A. maximum when the plane of the loop is perpendicular to "B" B. independent of the orientation of the loop C. maximum when the plane of the loop is parallel to "B" D. dependent on the shape of the loop for a fixed loop area

C. maximum when the plane of the loop is parallel to "B"

What is a physical combination of compounds or elements NOT chemically combined that can be separated by physical means? A. substance B. atom C. mixture D. molecule

C. mixture

When should a fuse be replaced with a higher rated unit? A. when the fuse of the original value is small in size B. when the original is not available C. never D. if it blows

C. never

One of the following characteristics of a resistive material which do not change its resistive value with respect to time is its _____ A. fidelity B. sensitivity C. stability D. selectivity

C. stability

24. What will happen if a Lead-acid battery is kept in discharged condition for long time? A. the battery will regain some charge B. the plåtes will get dissolved in electrolyte C. the plates will become sulphated D. the acid and water in electrolyte will dissociate

C. the plates will become sulphated

Which of the following statement is incorrect? A. open transistor has three (3) terminals B. transistors have three (3) terminals C. typical power rating of carbon-composition resistor ranged 0.001 W to 0.1 W D. potentiometer has three (3) terminals

C. typical power rating of carbon-composition resistor ranged 0.001 W to 0.1 W

Electric pressure in an electric circuit is also called A. resistance B. power C. voltage D. energy

C. voltage

For a carbon-composition resistor. A resistance of 0.47 ohm will be represented by stripes from left to right. A. yellow, green & white B. yellow, violet, black & white C. yellow, violet, & silver D. yellow, blue & gold

C. yellow, violet, & silver

Resistor with colored bands in the body A. Adjustable resistor B. Wire-wound resistor C. Variable resistor D. Carbon composition resistor

D. Carbon composition resistor

The inverse capacitance is called _______. A. Reluctance B. Conductance C. Susceptance D. Elastance

D. Elastance

_____ is one factor that does not affect resistance. A. Resistivity B. Cross sectional area C. Length D. Mass

D. Mass

The energy in an electron that is called the energy of position A. Kinetic energy B. Kinematics C. Electromotive force D. Potential energy

D. Potential energy

For which of the following parameter variation, the capacitance of the capacitor remains unaffected? A. Distance between plates B. Area of the plates C. Nature of dielectric D. Thickness of the plates

D. Thickness of the plates

What does the fourth loop of an electronic resistor color code represent? A. Multiplier B. Temperature C. First digit of the equivalent value D. Tolerance

D. Tolerance

Which of the following does not refer to electric energy? A. Joule B. Watt second C. Volt coulomb D. Volt ampere

D. Volt ampere

Electric energy refers to ______. A. Joules divided by time B. Volt-ampere C. Watt D. Volt-coulomb

D. Volt-coulomb

For measuring the resistance of the elements of an attenuator which of the following is the best choice? A. Maxwell's bridge B. Ohmmeter C. Megger D. Wheatstone Bridge

D. Wheatstone Bridge

Ion is _____. A. free electron B. nucleus without protons C. proton D. an atom with unbalanced charges

D. an atom with unbalanced charges

Determine which of the following has the least number of electrons found at the outer shell. A. semi-insulator B. insulator C. semiconductor D. conductor

D. conductor

Which of the following material is referred to as a medium whereby electrons can move easily from atom to atom? A. insulator B. dielectric C. mica D. conductor

D. conductor

When an atom gains an additional _____, it results to a negative ion. A. atom B. neutron C. proton D. electron

D. electron

A substance which cannot be reduced to a simpler substance by chemical means A. atom B. molecule C. matter D. element

D. element

It is defined as anything that occupies space and has weight. A. atom B. compound C. molecule D. matter

D. matter

It is a neutral particle that has no electrical charge. A. atom B. proton C. electron D. neutron

D. neutron

The unit of magnetic flux is the same as that of A. reluctance B. permeance C. inductance D. pole strength

D. pole strength

The definite discrete amount of energy required to move an electron from a lower shell to higher shell. A. quantum B. positive energy C. negative energy D. quanta

D. quanta

The number of compounds available in nature is ______. A. 105 B. 300 C. 1000 D. unlimited

D. unlimited