EE SET 1 Flashcards by Pauline Peralta

The voltage applied across an electric press was reduced by 50%. The power consumed by the press will be reduced by
A. 75%
B. 60%
C. 25%
D. 50%

75%

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The current flowing in L and C at parallel resonance are
A. equal
B. different
C. infinite
D. zero

equal

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Resistor 1 has twice the resistance of resistor 2. They are connected in parallel to a battery. Find the ratio of the thermal energy generation rate in resistor 1 to that in resistor 2.
A. 4:1
B. 2:1
C. 1:4
D. 1:2

1:2

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The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in series and a potential difference is maintained across the combination. Then:
A. the current in 1 is twice that in 2
B. the current in 1 is half that in 2
C. the potential difference across 1 is half that across 2
D. the potential difference across 1 is twice that across 2

the potential difference across 1 is twice that across 2

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The power lost is MORE consider in the design of
A. the transmission line
B. a motor
C. the feeder
D. a generator

the transmission line

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An RLC series circuit, connected to a source E, is at resonance. Then:
A. the voltage across C is zero
B. the voltage across R is zero
C. the voltage across R equals the applied voltage
D. the voltage across L equals the applied voltage

the voltage across R equals the applied voltage

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When electrons build up pressure at one point, it is called
A. impedance
B. current flow
C. ganging
D. pressure filing

current flow

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___ is a process by which atoms are split apart to release energy.
A. Fusion
B. Fission
C. Nuclear Spitting
D. Carburizing

Fission

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In a capacitor start motor, the capacitor is replaced by an inductor having the same reactance as in capacitor. Then the motor will
A. start but run at a slow speed
B. start and run at its rated speed
C. not start
D. be damaged

not start

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A magnetic field exerts a force on a charged particle:
A. if the particle is moving across the field lines
B. if the particle is moving along the field lines
C. always
D. never

if the particle is moving across the field lines

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When the frequency of the oscillator in a series RLC circuit is doubled:
A. the capacitive reactance is doubled
B. the capacitive reactance is halved
C. the impedance is doubled
D. the current amplitude is doubled

the capacitive reactance is halved

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Overhead transmission lines are protected from lightning with the use of which? I. Overhead grounding conductor II. Surge arrestors
A. neither I nor II
B. II only
C. either I or II
D. I only

either I or II

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For remote operation, which of the following a circuit breaker must be equipped with?
A. Time - delay
B. Very inverse time
C. Shunt
D. Inverse time

shunt

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Guy wire is used in the construction of distribution lines for what purpose?
A. supporting the pole
B. protection against surges
C. providing emergency grounding
D. support the conductor

supporting the pole

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The magnetic field B inside a long ideal solenoid is independent of:
A. the core material
B. the cross-sectional area of the solenoid
C. the spacing of the windings
D. the current

the cross-sectional area of the solenoid

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In a purely capacitive circuit the current:
A. leads the voltage by one-fourth of a cycle
B. lags the voltage by one-half of a cycle
C. leads the voltage by one-half of a cycle
D. lags the voltage by one-fourth of a cycle

leads the voltage by one-fourth of a cycle

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An A.C.S.R conductor having 7 steel strands surrounded by 24 aluminum conductors will be specified as
A. 7/24
B. 24/7
C. 31/7
D. 7/31

24/7

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Two wires made of the same material have the same lengths but different diameters. They are connected in parallel to a battery. The quantity that is NOT the same for the wires is:
A. the current
B. the current density
C. the electric field
D. the end-to-end potential difference

the current

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What extends the range of a dc ammeter?
A. shunt resistance
B. inductance
C. current transformer
D. capacitor

shunt resistance

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What is the maximum output power of a cellular transmitter?
A. 3 W
B. 4.5 W
C. 1.5 W
D. 6 W

3 W

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One primary and one secondary terminal of a two-winding transformer are connected to an ohm-meter instrument. What will be the reading on this instrument?
A. Zero
B. Zero or infinity
C. Infinity
D. Equal to winding resistance

Infinity

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The unit “henry” is equivalent to:
A. ohm
B. volt ⋅ second/ampere
C. ampere ⋅ volt/second
D. volt/second

volt ⋅ second/ampere

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______________ first computer designed and primarily used to calculate artillery firing tables for the United States Army’s Ballistic Research Laboratory In 1945.
A. ASUS ROG
B. LENOVO YOGA
C. APPLE
D. ENIAC

ENIAC

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What device is used to determine hotspots?
A. Thermal Scanner
B. Matamometer
C. Thermometer
D. Hi-pot Tester

Thermal Scanner

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When the amplitude of the oscillator in a series RLC circuit is doubled, the _________. A. impedance is doubled B. capacitor reactance is halved C. voltage across the capacitor is halved D. current amplitude is doubled

current amplitude is doubled

When the voltage remains the same, the current will ____ as the impedance decreases. I. decrease II. increase A. I only B. II only C. Both D. Either I or II

II only

The overcurrent protective device is caused to operate by ______. A. impedance B. Voltage drop C. Voltage surge D. current flow

current flow

Which of the following power plant in a NON-Renewable Energy? A. Wind energy B. Geothermal energy C. Nuclear energy D. Solar energy

Nuclear energy

Which statement is true? A. Magnetic flux lines have sources only B. Magnetic flux lines have sinks only C. Magnetic flux lines does not have sources and sinks D. Magnetic flux lines have both sources and sinks

Magnetic flux lines does not have sources and sinks

Which of the following is a primary disadvantage of AM over FM? A. Noise susceptibility B. Excessive use of spectrum space C. Higher cost and complexity D. Lower efficiency

Noise susceptibility

Iron, rather than copper, is used in the core of transformers because iron: A. makes a good permanent magnet B. can withstand a higher temperature C. has a greater resistivity D. has a very high permeability

has a very high permeability

A copper rod has resistance R. It is reinforced to half its original length and half its diameter. What is the new resistance? A. 1/2 R B. 4R C. 2R D. R

The purpose of using capacitor is to: I. Improve voltage II. Reduce technical losses A. II only B. Neither I and II C. Both I and II D. I only

Both I and II

Which of the following is a valid disadvantage of Sulphur Hexafluoride circuit breaker? A. Operation is noisy B. High maintenance C. Arced gas is poisonous D. Gas is flammable

Arced gas is poisonous

In a purely resistive circuit the current: A. leads the voltage by one-fourth of a cycle B. lags the voltage by one-fourth of a cycle C. is in phase with the voltage D. leads the voltage by one-half of a cycle

is in phase with the voltage

The boundary of the protection system is determined by the location of A. current transformers B. circuit breakers C. voltage transformers D. Protective relays

current transformers

Differential relays are used to protect the transformer against A. Reverse current B. No voltage C. Internal faults D. Overcurrents

Internal Faults

For an unbalanced load, which is the most suitable connection? A. 3-wire wye connection B. 3-wire delta connection C. 3-wire open delta D. 4-wire wye connection

4-wire wye connection

If R is the distance from a magnetic dipole, then the magnetic field it produces is proportional to: A. R B. 1/R^3 C. 1/R D. R^2

1/R^3

A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the energy stored in the electric field of the capacitor is a maximum is: A. T/2 B. T/4 C. 2T D. T

T/2

Diesel power plant is best suited as A. Peak load B. Standby C. General Purpose D. Base Load

Standby

Two resistors are connected in parallel across a potential difference. The resistance of resistor A is twice that of resistor B. If the current carried by resistor A is I, then what is the current carried by B? A. 4I B. 2I C. I D. I/2

The rating of a circuit breaker is generally determined on the basis of A. Single line to ground fault current B. Symmetrical fault current C. Line-to-line fault current D. Double line to ground fault current

Symmetrical fault current

Which of the following is NOT a reason why single-phase induction motor run? A. hysteresis B. Cone of the current is made out of phase between the lines C. two windings are displaced from each other D. shaded poles

hysteresis

The terminal potential difference of a battery is less than its emf: A. only when the battery is being charged B. under all conditions C. only when there is no current in the battery D. only when the battery is being discharged

only when the battery is being discharged

The undervoltage relays are usually used for what protection of the electrical equipment? A. feeder protection B. transformer protection C. bus-bar protection D. motor protection

motor protection

What type of transformer bank is used to convert 2-phase to 3-phase power? A. scott-T B. open-delta C. delta-wye D. wye-delta

scott-T

A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the energy stored in the magnetic field of the inductor is a maximum is A. T/4 B. T C. 2T D. T/2

T/4

For any circuit, the number of independent equations containing emf’s, resistances and currents equals: A. the number of branches minus 1 B. the number of branches C. the number of junctions minus 1 D. the number of junctions

the number of branches

Its primary function is to provide ground source. A. tertiary transformer B. sectionalizer C. zig-zag transformer D. surge arrester

zig-zag transformer

AC Directional Overcurrent relay is designated as number A. 51 B. 87 C. 52 D. 67

An electric field is associated with every: A. magnetic field B. object moving in a magnetic field C. time-dependent magnetic field D. time-dependent magnetic flux

time-dependent magnetic field

GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the grid to the PGC. What does GMC stands for? A. Grid Market Commission B. Generation Management Corporation C. Generator Management Committee D. Grid Management Committee

Grid Management Committee

The time constant RC has units of: A. second/farad B. second/ohm C. none of these D. 1/second

none of these

Which of the following transformer has only one winding? A. current B. distribution C. autotransformer D. power

autotransformer

What device is used to measure the temperature of a motor winding while the motor is in operation? A. Thermocouples B. Seismic probe C. Proximity probe D. Resistance temperature detector

Resistance temperature detector

The condition in Ohm’s law is that A. ratio V/I should be constant B. the temperature should remain constant C. current should be proportional to voltage D. the temperature should var

the temperature should remain constant

The rms value of an ac current is: A. that steady current that produces the same rate of heating in a resistor as the actual current B. that steady current that will charge a battery at the same rate as the actual current C. its average value D. its peak value

that steady current that produces the same rate of heating in a resistor as the actual current

For a transmission line terminated in its characteristic impedance, which of the following statement is incorrect: A. Standing wave does not exist. B. Efficiency of transmission of power is maximum C. The energy distribution between magnetic and electric field is not equal. D. It is a smooth line.

The energy distribution between magnetic and electric field is not equal.

To adjust the power of the alternator, adjust the _________. A. frequency B. field current C. governor D. power factor

governor

What contains in each cell site of cellular telephone system? A. Control computer B. Repeater C. Touch-tone processor D. Direct-link to a branch exchange

Repeater

Compared to Gauss-Seidel, Newton-Raphson method takes A. Less number of iterations and more time per iteration B. More number of iterations and more time per iteration C. More number of iterations and less time per iteration D. Less number of iterations and less time per iteration

Less number of iterations and more time per iteration

T/4

The dc armature winding in which the coil sides are placed a pole pitch apart is called ___ winding. A. Fractional pitch B. Pole-pitch C. Multiplex D. Full-pitch

Full-pitch

For a loop of current-carrying wire in a uniform magnetic field the potential energy is a minimum if the magnetic dipole moment of the loop is: A. perpendicular to the field B. in the direction opposite to that of the field C. in the same direction as the field D. at an angle of 45 degree to the field

in the same direction as the field

Which of the following protects a cable against mechanical injury during handling and laying? I. Armouring II. Bedding A. II B. Both I and II C. Either I or II D. I

EE SET 1 Flashcards

(66 cards)