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WorksheetsEE TERMS
Total questions: 128
Worksheet time: 1hrs 4mins
The phase shift between the current and voltagevectors us due to the following except one
A. magnet coils
B. power capacitors
C. electric flat iron
D. fluorescent lamp
It is the value of sine wave of voltage or current at one
particular instant of time.
A. average value
B. effective value
C. rms value
D. instantaneous value
Measured in Hertz, it is the number of cycles of
alternating current per second.
A. frequency
B. period
C. peak to peak
D. wavelength
What is the phase relationship between current and
voltage in an inductor?
A. in phase
B. current lags voltage by 90°
C. voltage lags current by 90°
D. current lags voltage by 180°
If sine wave voltage varies from 0 to 200 V, how much
is its instantaneous voltage at 90°?
A. 100 V
B. minimum voltage
C. 200 V
D. half of its maximum voltage
ECE Board Exam November 2000
How many degrees are there in one complete wave
cycle?
A. 360 degrees
B. 90 degrees
C. 180 degrees
D. 720 degrees
When comparing rms voltage and average voltages,
which of the following statement is true, assuming
sine waves?
A. Either the rms voltage or the average voltage
might be larger.
B. The average voltage is always greater than the
rms voltage.
C. There will always be a very large difference
between the rms voltage and the average
voltage.
D. The rms voltage is always greater than the
average voltage
It is the maximum instantaneous value of a varying
current, voltage, or power equal to 1.414 times the
effective value of a sine wave.
A. rms value
C. effective value
B. peak to peak value
D. peak value
It is the description of two sine waves that are in step
with each other going through their maximum and
minimum points at the same time and in same
direction.
A. stepped sine waves
B. sine waves in coordination
C. phased sine waves
D. sine waves in phase
The relation of the voltage across an inductor to it
current is ____
A. Lagging the current by 90 degrees
B. Leading the current by 90 degrees
C. In phase with the current
D. Leading the current by 180 degrees
In a series resonant RLC circuit, all of the following
statements are correct EXCEPT one. Which one is
this?
A. The resonant frequency is dependent on the
resistance of the circuit.
B. The phase angle between the voltage and the
current vectors is zero.
C. The impedance is a minimum.
D. The current is a maximum
The current in RLC series circuit at resonance is
A. maximum
B. minimum
C. zero
D. infinity
ECE Board Exam November 1996
____ frequency is reached when the capacitive and
inductive reactance in a tuned circuit are equal.
A. zero
B. pulsating
C. infinite
D. resonant
.ECE Board Exam November 2000
In an “IDEAL” resonant circuit, what is the relationship
between the current and the impedance?
A. current high, impedance low
B. current low, impedance low
C. current low, impedance high
D. current high, impedance high
What condition does resonance occur in an electrical
circuit?
A. When the power factor is at minimum
B. When the square root of the sum of the capacitive
and inductive reactances is to the resonant
frequency
C. When the inductive and capacitive reactances
are equal
D. none of the above
What is the relationship between frequency and the
value of XC?
A. frequency has no effect
B. XC varies directly with frequency
C. XC varies inversely with frequency
D. XC varies indirectly with frequency
When is the line current minimum in a parallel LC
circuit?
A. at the broadcast frequency
B. at the circuit frequency
C. at the resonant frequency
D. at the highest frequency
It is the term for the phenomena which occurs in an
electrical circuit when the inductive reactance
balances with the capacitive reactance.
A. reactive equilibrium
B. resonance
C. reactive quiescence
D. high Q
What is the effect in terms of bandwidth when the Q of
a single-tuned stage is doubled?
A. halved
B. the same
C. doubled
D. four times
____ refers to reactive power.
A. power consumed in circuit Q
B. power consumed in wire resistance in an inductor
C. wattles, non-productive power
D. power lost because of capacitor leakage
How do you call the nature of a circuit during series
resonance?
A. unstable
B. capacitive
C. resistive
D. inductive
In a series resonant LC circuit, what is the impedance
at resonant frequency?
A. Infinity
B. Determined solely by the dc resistance
C. The maximum impedance value
D. Zero
What is the characteristic of the current flow in a
parallel R-L-C circuit at resonance?
A. The current circulating in the parallel elements is
dc
B. The current circulating in the parallel elements is
zero
C. The current circulating in the parallel elements is
at a maximum
D. The current circulating in the parallel elements is
at a minimum
What is the responsible for the phenomenon when
voltages across reactances in series can often be
larger than the voltage applied to them?
A. Capacitance
B. Resistance
C. Conductance
D. Resonance
Term used for resonance in an electrical circuit.
A. The frequency at which power factor is at a
minimum
B. The frequency at which capacitive reactance
equals inductive reactances
C. The highest frequency that will pass current
D. The lowest frequency that will pass current
The _____ the Q of a circuit, the narrower is its
bandwidth.
A. Lower
B. Broader
C. Higher
D. Selective
What is the term for the number of times per second
that a tank circuit energy is stored in the inductor of
capacitor?
A. Non-resonant frequency
B. Broadcast frequency
C. Circuit frequency
D. Resonant frequency
What is the cause of a minimum Q on a single-tuned
LC circuit?
A. Decreased shunt resistor
B. Decreased capacitance
C. Increased shunt resistor
D. Decreased series resistor
____ is another term for quality factor or Q of the
resonant circuit.
A. Noise factor
B. Noise figure
C. White noise
D. Figure of merit
The copper loss of the transformer will
A. not be affected by a change in the power factor
B. decrease with a lowering of the power factor
C. increase with an increase of the power factor
D. increase with the lowering of the power factor
Power lost due to alternating magnetization and
demagnetization of the core material
A. copper loss
B. eddy current loss
C. hysteresis loss
D. rheostat loss
In the open circuit test of the transformer the
wattmeter reading is equal to
A. eddy current loss
B. current loss
C. hysteresis loss
D. core loss
Ideal transformer assumptions do not include
A. no leakage flux
B. no saturation of core
C. zero resistance of the winding
D. zero reactance of the winding
Which of the following given below is the eddy current
loss not proportional to?
A. square of the thickness
B. square of the frequency
C. square of the load current of the laminated core
D. square of the flux density
Transformer connection that can transform threephase system to two-phase system and vice versa
A. Scott or T-connection
B. open delta
C. autotransformer connection
D. wye-delta connection
When the emf in the two windings of a transformer are
opposite in direction, the polarity is
A. positive
B. additive
C. negative
D. subtractive
Its primary function is to provide ground source
A. zigzag transformer
B. sectionalizer
C. surge arrester
D. tertiary transformer
What is the main use of a zigzag transformer?
A. to step down voltage
B. to provide path to zero sequence currents
C. to stabilize transformer sequence currents
D. to step down current
Which of the following is not a reason why a single
phase induction motor will not run?
A. one of the current is made out of phase between
the lines
B. hysteresis
C. shaded poles
D. two windings displaced from each other
The following are types of AC motor starters except
one
A. reactance starter
B. wye-delta starter
C. across the line starter
D. capacitance starter
Motor starting device that will reduce the voltage
impressed at motor’s terminals during starting
periods.
A. autotransformer
B. primary resistor-type
C. wye-delta starter
D. all of these
Basically all electric motors operate on the principle of
repulsion or ____.
A. induction
B. magnetism
C. resistance
D. capacitance
The principle of operation of induction motor is based
on
A. Fleming’s right hand rule
B. rotating magnetic field
C. Faraday’s law
D. Ohm’s law
A compensator is a device that is used with
alternating current motors to ____.
A. boost the supply voltage during starting periods
B. compensate for low power factor when motor is
not fully loaded
C. reduce the supply voltage during starting periods
D. compensate for voltage drop in the circuit
A single-phase motor provided with a squirrel cage
winding on its rotor in addition to its regular winding is
called
A. split-phase induction motor
B. repulsion induction motor
C. universal motor
D. repulsion-start induction motor
A test used to determine the equivalent resistance of
an induction motor is
A. no-load test
B. short circuit test
C. blocked rotor test
D. polarity test
Rapid stopping of a motor by momentarily connecting
the motor in reverse direction is called
A. jogging
B. inching
C. plugging
D. sequence operation
Repeated starting and stopping of a motor is referred
to as
A. stepping
B. jogging
C. phasing
D. none of these
An induction motor driven above synchronous speed
is called
A. induction regulator
B. frequency changer
C. induction generator
D. phase converter
Power factor improvement may be achieved by the
use of
A. synchronous motor
B. synchronous converter
C. long transmission line
D. induction motor
A synchronous motor
A. will have a low power factor when run below rated
speed
B. may have its speed varied by inserting a rheostat
in the DC field current
C. will slow down with an increase in load within the
limits of its pull out torque
D. will take minimum line current at any load when
operating at unity power factor
In starting a 500 HP, 2,300 volts, 3-phasesynchronous motor the field winding is initially shortcircuited so as to
A. provide better flux distribution in the air gap
B. increase induced voltage in field winding
C. produce much larger starting torque
D. lower voltage produced between layers of the
field
A synchronous motor running without load is
A. synchronous converter
B. synchronous condenser
C. capacitor motor
D. induction motor
A certain wire has a resistance R. The resistance of
another wire identical with the first except for having
twice its diameter is
A. 4R
B. R/2
C. 2R
D. R/4
The equivalent wye element of a 3 equal resistors
each equal to R and connected in delta is
A. R
B. 3R/2
C. R/3
D. 3R
When heat is transferred into any other form of energy
or when other forms of energy are converted into
heat, the total amount of energy is constant. This is
known as
A. First law of thermodynamics
B. Boyle’s law
C. Specific heat
D. Isothermal expansion
In the American wire gauge, as the number of gauge
increases, the diameter of wire ____
A. increases
B. decreases
C. does not change
D. become twice
In cgs system, what is the unit of emf where I is in
abampere and P is in erg per second?
A. millivolt
B. kilovolt
C. abvolt
D. volt
One (1) kW is equal to ____ hp.
A. 0.746
B. 1.34
C. 550
D. 1.5
What is 1012 ergs/sec in kW?
A. 100 kW
B. 1,000 kW
C. 10 kW
D. 10,000 kW
The growth of current in an inductive circuit follows
A. Linear law
B. Exponential law
C. Ohm’s law
D. Hyperbolic law
The time constant of an RL series circuit is
A. R + L
B. R/L
C. L/R
D. RL
If a dc voltage is applied to an initially uncharged
series RC circuit, the initial value of the current is
A. zero
B. V/R
C. infinite
D. CV
One of those listed is not of dc generator winding.
A. drum
B. progressive
C. gramme-ring
D. lap
What is the solution to reduce rotor friction to a large
generator?
A. use sulfur hexafluoride gas in rotor chamber
B. use hydrogen gas in the rotor chamber
C. use lubricating oil in the rotor chamber
D. apply vacuum in the rotor chamber
Interpoles are connected in ____ with the armature
and compensating windings are connected in ____
with the armature.
A. shunt, shunt
B. shunt, series
C. series, shunt
D. series, series
The generator’s ripples in the dc emf generated are
reduced by using
A. equalizer ring
B. commutator with large number of segments
C. quality carbon brushes
D. all of these
What dc motor over-speeds at light loads?
A. series motor
B. shunt motor
C. cumulative compound generator
D. differential compound generator
DC motor starters are used for the following functions
EXCEPT one. Which one is this?
A. control the speed of the motor
B. start large DC motors
C. limit the starting current of the motor
D. prevent large voltage drop during starting
If you try to start a DC compound motor the shunt field
of which is open, what would happen?
A. it will overspeed
B. the direction of rotation will reverse
C. the fuse will blow
D. it will not start
The speed of a series motor at no load is
A. 3,600 rpm
B. infinity
C. 300 rpm
D. zero
The armature of a dc shunt motor is laminated to
reduce the
A. inductivity of the armature
B. hysteresis loss
C. mass of the armature
D. eddy-current loss
A dc series motor is started without load the effect is a
rapid increase in
A. current drawn
B. its emf
C. speed
D. torque
The rotation of a direct current motor may be reversed
by
A. reversing the line connection to the motor
B. reversing either the armature or field
C. reversing both the armature and field connection
D. shifting the brushes opposite to the direction in
which the motor is rotating
The DC motor armature whose speed is to be
controlled by Ward-Leonard system is fed by
A. 3-phase motor
B. DC generator
C. Rectifier
D. DC supply in parallel with the rheostat
.REE Board Exam April 1997
Laminated iron is used in AC magnetic circuits for the
following reasons. Which is the best answer?
A. to increase the rate of heat dissipation
B. to make the assembly of the device easier
C. to reduce the permeability
D. to reduce eddy currents
A permanent magnet is one where the material’s
domain remains aligned even after the external
magnetic field is removed. Which of the following
materials is not a permanent magnet?
A. cobalt
B. alnico cobalt hard ferrite silicon iron
C. hard ferrite
D. silicon iron
Electromotive force is usually measured in what unit?
A. Newton
B. Volt
C. Kilogram
D. Ampere
What is the symbol for magnetic flux density?
A. H
B. E
C. B
D. Q
Those magnetic materials are best suited for making
armature and transformer cores which have ____
permeability and ____ hysteresis loss.
A. high, low
B. low, high
C. high, high
D. low, low
Permanent magnets are normally made of
A. cast iron
B. wrought iron
C. aluminum
D. alnico alloys
It is the unconventional unit of mmf in CGS system.
A. unit pole
B. statvolts
C. gilberts
D. ampere turns
An instrument used to measure the intensity of a light
source
A. illumination meter
B. Bensen photometer
C. cygnometer
D. candle meter
The ratio of lumens reaching the work plane divided
by the total lumens generated by the light is
A. room ratio
B. coefficient of utilization
C. illumination factor
D. maintenance factor
Which of the following affect the overall efficiency of a
lighting installation?
A. age of lamp
B. dust and dirt
C. voltage
D. all of these
The rate of passage of radiant energy evaluated by
reference to the luminous sensation produced by it is
called
A. luminous flux
B. luminous radiation
C. luminous plane
D. luminosity
An ac device used to measure the angle between the
voltage and its current.
A. phase angle meter
B. demand meter
C. power factor meter
D. reactive meter
Which of the following instrument is suited for high
frequency measurements?
A. thermocouple
B. dynamocouple
C. moving iron vane
D. oscilloscope
What does a voltmeter indicate?
A. total current
B. coulombs per second
C. potential difference
D. resistance per meter
In addition to supporting the moving coil, the
aluminum bobbin in a permanent moving coil meter
performs the function of one of the following. Which
one is this?
A. reduce the reluctance
B. balance the pointer
C. conducts magnetic flux lines
D. dampens the needle movement
What effect on the pointer operation if any, will
reversing the leads of a DC permanent moving coil
instrument have, when taking the readings?
A. The pointer swings to the opposite direction.
B. It still indicates correctly.
C. It indicates maximum value.
D. The needle oscillates back and forth.
The damping force acts on the moving system of an
indicating instrument only when it is
A. stationary
B. just starting to move
C. moving
D. near its full deflection
Which meter used dual triode tube and requires
external power for operation?
A. TVM
B. FETVM
C. VOM
D. VTVM
A meter device that tests insulation resistance is the
A. megohmmeter
B. transistor checker
C. gauss meter
D. voltage tester
An instrument often used to check the degree of
motor shaft misalignment is the
A. dial indicator
B. clamp-on ammeter
C. voltmeter
D. megohmmeter
An ac device used to measure the angle between the
voltage and its current.
A. phase angle meter
B. demand meter
C. power factor meter
D. reactive meter
An instrument used to measure high resistance as in
the measurement of insulation resistance.
A. ohmmeter
B. multi-tester
C. Wheatstone bridge
D. megger
Which of the following instrument is suited for high
frequency measurements?
A. thermocouple
B. dynamocouple
C. moving iron vane
D. oscilloscope
What does a voltmeter indicate?
A. total current
B. coulombs per second
C. potential difference
D. resistance per meter
What extends the range of a dc ammeter?
A. inductance
B. capacitor
C. current transformer
D. shunt resistance
The ratio of the average load on the plant for the
period of time considered to the aggregate rating of all
the generating equipment
A. capacity factor
B. load factor
C. utilization factor
D. Diversity Factor
Power plant curves or graphs showing the direct
relationships of the peak load and the generated
energy of the said plant is
A. load curve/graph
B. load duration curve
C. modified load curve
D. none of the above
In fission, energy is produced when
A. chemical compound split into its constituents
B. nuclear particles combine
C. nuclear particles split
D. molecules combine
In the list below, which one is not a type of present
day nuclear power plant?
A. boiling water reactor
B. fusion-fission reactor
C. low pressure reactor
D. fast breeder reactor
The energy of present nuclear plants comes from
A. the fusion of radio active materials
B. the friction of high speed electrons against
protons
C. the destruction of very tiny particles released
when atoms split
D. the heat produced by the collision of high speeed
protons
A relay is used to
A. receive a signal and record
B. connect a line to the source
C. protect a circuit
D. relay a message to a remote place
It is the computerized data gathering, monitoring and
switching equipment
A. supervising control
B. remote control
C. SCADA
D. control and monitoring system
Which of the following is not use of the classes of
surge arresters?
A. transmission class
B. distribution class
C. station class
D. intermediate class
Which one of the following is not one of the relays
transmission line?
A. phase comparison relay
B. negative sequence relay
C. distance relay
D. ground relay
What is the meaning of SCADA?
A. System Coordinated Area/Distribution Area
B. System Control and Data Acquisition
C. Supervisory Control and Data Acquisition
D. Super Computer and Dec Accessibility and Data
Acquisition
Bushings, PT, transformer windings, insulators, these
have something in common
A. current rating
B. insulating coil
C. BIL rating
D. dielectric constant
Which of the following does not belong to the
protection of a transmission line?
A. distance relay
B. recluse relay
C. ground relay
D. reverse power relay
Surge arresters are needed in transmission line for
the following purpose. What is the important?
A. regulate the voltage
B. prevent the lighting from striking the line
C. protect the system from high voltage transients
D. protect the line from short circuit currents
The fault current that exists immediately after the fault
is known as
A. sub-transient current
B. transient current
C. steady state current
D. sustained current
In transmission lines, the most effective protection
against the lighting strike is one of the following.
Which one is this?
A. lighting rods
B. lighting arrester
C. Petersen coils
D. overhead wires
It is a disruptive discharge between electrodes of a
measuring gap, voltage control gap, or protective
device
A. flashover
B. sparkover
C. corona
D. flashover
The cause of nearly all high voltage flashovers in
transmission lines is due to one of the following.
Which one is this?
A. high humidity
B. dust and dirt
C. corona
D. lighting discharges
A circuit breaker that can be closed against a fault and
operated at once, although the solenoid mechanism
may continue through its closing operation, is said to
be
A. fully rated
B. trip free
C. direct current operated
D. selective
When alternating current is passing through aconductor there is a tendency for the current to crowdnear the surface of the conductor. This is known as
A. corona
B. magnetization
C. skin effect
D. resistivity
When a circuit breaker is selected for a particular
application, which one of the particular ratings is
usually considered most important?
A. maximum current rating
B. continuous rating
C. momentary rating
D. interrupting rating
The most economical size of a feeder is that for which
the annual cost of energy lost in the feeder equals the
cost of the interests and depreciation on the capital
cost of the conductor material.
A. Kirchhoff’s law
B. Faraday’s law
C. law of economics
D. Kelvin’s law
The most common tripping time for 60 Hz circuit
breaker is
A. 3 cycles
B. 15 cycles
C. 10 cycles
D. 8 cycles
The main contacts of a circuit breaker are most likely
to be operated by a
A. heavy duty switch
B. vacuum
C. mimic bus
D. solenoid
The current that a breaker must be able to carry
immediately after a fault occurs is known as
A. interrupting current
B. short circuit current
C. exciting current
D. momentary current
The reactance of a rotating machine that determines
the current that circuit breakers will have to open to
clear a fault or short-circuit is
A. subtransient
B. synchronous
C. transient
D. none of these
There is no zero sequence component of the fault
current for
A. line-to-line fault
B. single line-to-ground fault
C. symmetrical fault
D. double line-to-ground fault
Protective relays that operate on the principle that the
current entering and the current leaving a section are
equal normally but unequal when fault develops within
the section
A. differential relay
B. overcurrent relay
C. directional relay
D. none of these
The arcing contact on a circuit breaker are used to
A. reduce the heating of the trip coil
B. ensure that a closed circuit is made
C. prevent damage to the main contact
D. increase the magnetic field of the blow out coil
