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
