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WorksheetsElectrical Engineering Quiz
Total questions: 56
Worksheet time: 13mins
Which of the following parameters can be neglected for a short line?
resistance
inductance
reactance
capacitance
The curve representing Ohm's law is
a parabola
linear
a sine function
a hyperbola
The overcurrent protective device is caused to operate by ________.
voltage surge
current flow
voltage drop
impedance
What is the maximum number of bands permitted in rigid conduits between outlets?
4 quarter bends
2 quarter bends
6 quarter bends
3 quarter bends
Which of the following insulators will be selected for high voltage application?
strain type
disc type
suspension type
pin type
If the torque angle continuously increases, system will become
stable
oscillatory stable
unstable
asymptotic stable
The condition in Ohm's Law is that
ratio V/I should be constant
current should be proportional to voltage
the temperature should remain constant
the temperature should vary
Which of the following shall be included in the calculation of the reliability standard indices of the distributor asset by the Philippine Distributor Code?
Outages that occur on the secondary lines of the distribution system
Planned outages where the customers have been notified at least three(3) days prior to the loss of power
Outages that occur on the primary lines of the distribution system
Outages that occur in the transmission line
A type of electronics communication in which only one party transmits at a time.
Full duplex
Half duplex
Bicom
Simplex
An equal number of electrons is placed on two metal spheres 3cm apart in air. How many electrons are on each sphere if the resultant force is 4kN?
1.47 x 10^14 electrons
1.25 x 10^14 electrons
1.33 x 10^14 electrons
1.40 x 10^14 electrons
Base load plants are designed to supply power at
low capital cost and low operating cost
high capital cost and low operating cost
low capital cost and high operating cost
high capital cost and high operating cost
Peak load plants are designed to supply power at
low capital cost and low operating cost
high capital cost and low operating cost
low capital cost and high operating cost
high capital cost and high operating cost
A 440V, 60Hz, 6 pole, 3 phase induction motor has a rotor input power of 33kW at rated voltage and frequency. Under this condition, the rotor emf makes 126 complete cycles/minute. Find the rotor resistance in ohms/phase if the rotor current is 60A/phase.
0.0118
0.0107
0.107
0.118
If the effect of earth is taken into account, then the capacitance of line to ground
decreases
remains unchanged
increases
becomes infinite
The effective resistance of conductor is increased by
skin effect
corona effect
proximity effect
both (a) and (b)
Surge impedance of transmission line is given by
√C/L
√LC
1/√LC
√L/C
In a 6-pole alternator how many mechanical degrees is the equivalent of 180 electrical degrees?
60
30
120
90
A two terminal pair of network of a transmission line can be represented by a
Л- network
T-network
either (A) or (B)
tree network
In television system, channels 2 and 13 are classified as
VHF
UHF
SHF
EHF
An ACSR conductor has (n-1) layers around its single center strand, the total number of strands will be
3n2 + 3n +1
3n2 - 3n -1
3n2 + 3n -1
3n2 - 3n +1
An inductor motor with 8 poles, 60Hz is operated with a slip of 3%. Calculate the rotor speed.
1,684
1,024
873
92
Which of the following methods of generating electric power from sea water is more advantageous?
waterpower
Ocean power
tidal power
none of these
When installing two grounding electrodes, the minimum distance between them is
1,800 mm
2,000 mm
1,500 mm
2,400 mm
A 36 Ω resistor is connected in parallel with an unknown resistor R. Their combination is connected in series with a 12 Ω resistor. Find the value of R such that the power drawn by the parallel combination of 36 Ω and R is equal to the power in the 12 Ω resistor.
6 Ω
18 Ω
24 Ω
48 Ω
The current flowing in L and C at parallel resonance are
zero
equal
infinite
Difference
What does PEMC in EPIRA stands for
Philippine Energy Market Corporation
Private Energy Marketing Company
Philippine Electricity Market Corporation
Philippine Electrical Marketing Corporation
For two alternators operating in parallel, if the load shared by one of the, to be increased, as field excitation is
to be strengthened keeping input torque the same
to be weakened keeping input torque the same
to be kept constant but input torque should be increased
to be kept constant but input torque should be decreased
A 7.5 MVA, 69/13.8 kV, 3-phase transformer has 8% impedance. What us the per unit impedance at 10 MVA base?
0.24
0.106
0.06
0.096
Open circuit test on transformer is conducted to determine
hysteresis loss
copper loss
core loss
eddy current loss
Which of the following power plant is a conventional source of energy?
Solar energy
Geothermal energy
Coal energy
Wind energy
In a synchronous motor, the magnitude of stator back emf depends on
load on the motor
both the speed and rotor flux
dc excitation only
none of theses
A dc ammeter has an internal resistance of 0.1 Ω. A shunt of 1.01 x 10-3 Ω is connected to be ammeter. What is the multiplier of the set up?
10
50
80
100
A sine wave has a frequency of 60 Hz. Its angular frequency is
120 π
60 π
30 π
6 π
In a loss-free RLC circuit, the transient current is
oscillating
Square wave
sinusoidal
non-oscillating
What is the maximum flux in mWb of a transformer with 200 primary turns when connected to a 60 Hz, 200 V supply.
10.35
6.25
50.5
3.75
A 60 Hz, 4 pole, 3 phase induction motor has a slip of 2.5 %. What is the slip speed in rpm?
55
40
60
45
At very low frequencies a series RC circuit behaves as almost purely
resistive
inductive
capacitive
none of these
One of the advantages of distributing the winding in alternators is to
reduce harmonics
improve voltage waveform
reduce the amount of copper
decrease the value of the voltage
The effect of corona is
increased reactance
Increased energy loss
increased inductance
all of these
The rms value of pure cosine function is
0.5 of peak value
same as peak value
0.707 of peak value
zero
How many commutator bars does a 6-pole dc generator with 4 coil elements per slot and 20 slots per pole has?
60
120
240
48
A single-phase transmission line having a length of 15 miles is composed of two copper conductors spaced 7ft apart having a diameter of 0.0575inch. Determine the line to line capacitance in farad if the system frequency is 60Hz.
4.9 x10-12
9.8 x10-12
11.8 x10-9
118 x10-9
What is the equivalent IEEE device function number for directional power relay?
21
32
37
87
Energy radiated continuously in the form of lighting waves is called?
luminous intensity
lumen
luminousflux
illumination
Efficiency is secondary consideration in case of
base load plants
both base load and peak plants
peak load plants
none of these
To a series RLC circuit, a voltage of 10 v is applied. if Q of the coil at resonant frequency is 20., the voltage across the inductor at resonant frequency will be
200 v
100 v
75 v
50 v
The condition of a liquid electrolyte is measured in terms of its
current value
specific gravity
Acid content
Voltage output
If the of a dc shunt motor is opened
it will continue to run at its rated speed
the speed of the motor will become very high
The motor will stop
the speed of the motor will decrease
An ideal full-wave rectifier with non-inductive load has zero transformation losses. What is the efficiency?
70%
80%
90%
100%
IF a certain conductor has an area of 336.400 circular mils, what is the radius of this conductor in cm?
0.0663
0.810
0.737
0.921
The dummy coil in dc machines is used to
eliminate reactance voltage
eliminate armature reaction
bring about mechanical balance of armature
eliminate harmonics developed in the machine
The purpose of insulating oil when used on power circuit breaker are the following. EXPECT:
Interrupter
Coolant
Insulation
Quencher
The field system of a 50 Hz alternator has a sinusoidal flux per pole of 0.1 Wb . Calculate the emf generated in one turn which spans two-thirds of a pole pitch.
17.4 v
19.2 v
12.2 v
9.6 v
An 8-pole triplex wave-wound armature carries a total of 660 amperes. If there are 8 brush arms, calculate the current in each armature conductor.
110 A
66 A
22 A
11 A
Inside a hollow spherical conductor
electric field is zero
electric field is constant
electric field changes with distance from the center of the sphere
electric field is unity
Residual magnetism is necessary in a
separately excited generator
both of these
self-excited generator
none of these
