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Worksheets2021 EE
Total questions: 101
Worksheet time: 51mins
As a loop ot wire with a resistance of 10 ohm moves in a constant non-iniform magnetic field, it Loses kinetic energy at a uniform ra 4 mJ/s: Determine the induced current in the 1cop.
10 mA
30 mA
20 mA
cannot be calculated from the given data
A piece of conductor 10 cm long moves across the magnetic field of: 10 k gauss at a velocity of 120 cm/s. What is the voltage across the conductor?
A. 12 mV
B. 1.20 mV
C. 120 mV
D. 0.12 mV
One primary and one secondary terminal of a two-winding transformer is connected to an ohm-meter instrument. What will be the reading on this instrument?
A. impedance is doubled
B. zero
C) infinity
D. equal to winding resistance
A car battery is rated at 80 ampere-hour. An ampere-four is a unit of ____
A. power
B: energy
C. charge
D. current
The boundary of the protection system is determined by the location of
A. voltage transformers
B. current transformers
C. Protective realys
D. circuit breakers
GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the Grid to the PGC. What is the GMC stands for?
A. Grid Market Commission
B. Generation Management Corporation
C. Grid Management Committee
D. Generator Management Committee
Increasing the voltage of the transmission system to double of its original value with the same power to be transmitted, the new power losses of the transmission system will be of the original value.
A. twice
B. one half
C. the same
D. one-fourth
Calculate the value of aj+1.
A. 0.5 + j 0.866
B. 1 + j 0
C. 0.866 - j 0.5
D. 0.134 - j 0.5
The line currents in a three-phase, four-wire system are Ia = 30 ÷ j 40, Ib = 20 + j 20 and Ic = -40 - j 20 S, respectively. What is the negative sequence current for phase A in Ampere?
A. -25 + j 4
B. 25 - j 4
C. 25 - j 4
D. -25 - j 4
The resistance of the primary coil of a well-designed 1:10. step-down transformer is 1 ö. With the secondary circuit open, the primary is connected to a 12 V ac generator. What is the primary current?
A. About 12 A
B. Depends on the core material
C. About 120 A
D. Essentially zero
A 120-V power line is protected by a 15 A fuse. What is the maximum number of "120 V, 500W " light bulbs that can be operated at full brightness from this one?
A. 2
B. 4
C. 3
D. 5
A certain x-ray tube requires a current of 7 mA at a voltage of 30 kV. What is the rate of dissipation in watts?
A. 5600
B. 26
C. 560
D. 11.4
Which of the following depends on the electromotive force of a DC generator?
A. commutation
B. brush contact
C. speed
D. frequency
Which of the following protective relay/s operates on the principle of the Kirchoff's Current Law?
A. Overcurrent relay
B. Undercurrent relay Reverse
C. current relay
D. Differential relay
If a coil draws 0.50 A from a 120 V, 60 Hz source at a 70% lagging power factor, what are the coil resistance in ohm and inductance in H?
A. R = 171 and L = 0.455
B. R 168 and L = 0.554
C. R = 171 and L = 0.554
D. R = 168 and L = 0.455
What is the allowable rating for branch overload protection if fuse is used for a hermetic motor compressor with a rated load current of 25 A?
A. 35 A
B. 15 A
C. 20 A
D. 30 A
A permeable substance is one ____________
A. which is a good conductor
B. which can behave as a conductor as well as an insulator
C. which is a strong magnet
D. through which the magnetic lines of force can pass very easily
Which of the following has the greatest effect in decreasing the oscillation frequency of an IC circuit? Using instead A. L/2 and 2C B. 2L and C/2 8? 27 end 20 L/2 and C/2
A. L/2 and 2C
B. 2L and C/2
C. 2L and 2C
D. L/2 and C/2
The illumination of a surface 3.40 m directly belcw a light source 1s 25 lux. Find the intensity of the light source.
A. 347 cd
B. 289 cd
C. 231 cd
D. 393 cd
Guy wire is used in the construction of distribution lines for what purpose?
A. providing emergency grounding
B. supporting the pole
C. support the conductor
D. protection against surges
Two equal charges of opposite signs are separated by a horizontal distance of 70 mm. If the resultant electric field at the midpoint of the line is 4 x 104 N/C. Find the maanitude of each charge.
A. 3.6 nC
B. 2.7 nC
C. 4.5 nC
D. 2.4 nC
The customer is only charged or credited as the case may be, for the difference between the electricity supplied by the Distribution utility and electricity it supplies to the Distribution Utility when the times it has excess VRE generation both of which are metered using either 2 uni-directional meters, one for import and one for export, or a single bi-directional meter. What do you called this scheme?
A. Dual Metering
B. Net Metering
C. Market Metering
D. Import-Export Metering
A 2-T uniform magnetic field makes an angle of 30 ½ with the z axis. The magnetic flux through a 3-m» portion of the xy plane is _____ Wb.
A. 12
B. 4.3
C. 6
D. 5.2
Which of the following statement is CORRECT concerning electric field?
A. Electric field lines may cross
B. Electric field point away from a negatively charged particle
C. Electric field are closed together where the field is large
D. A charged point particle released from the rest moves along a field line.
Which of the following is the eddy current loss proportional to?
A. square of the flux density
B. the square of the load current of the laminated core
C. square of the frequency
D. square of the thickness
Chm's Law does NOT apply to
A conductor
B. semi-conductor
C. electronic circuit
D. electrical circuit
All grounding connections are made and electrically A. temporary, non-continuous B. permanent, continuous C. temporary, continuous D. permanet, non-continuous
A. temporary, non-continuous
B. permanent, continuous
C. temporary, continuous
D. permanent, non-continuous
A certain amount of fuel contains 17 x 10^10 Btu of energy. What is the corresponding energy in Gigacalories?
A. 47.3
B. 49.4
C. 45.5
D. 42.8
The size of the sole connection of a grounding electrode conductor connected to a concrete-encased electrode shall not be required to be which of the following:
A. Connected to an electrode encased by at least 100 mm of concrete
B. Connected to an electrode encased by at least 50 mm of concrete
C. Larger than 22 mm» copper
D. Larger than 38 mm» copper
If a tropical storm is going to the Philippine Area of Responsibility (PAR) within 24 hours what type of alert is to be raised in accordance to the Philippine Grid Code?
A. Red Alert
B. Yellow Alert
C. Blue Alert
D. Orange Alert
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.
Three phase short circuit of an alternator will be _____.
A. very small
B. infinity
C. zero
D. maximum
What is the quality factor Q of an RLC series circuit having R = 5 Í; L = 10 mH and C = 100 ÍF?
A. 4
B. 1
C. 3
D. 2
Which of the following will you connect to make a galvanometer into an ammeter?
A. A low resistance in series
B. A low resistance in parallel
C. A high resistance in series
D. A high resistance in parallel
A certain copper wire has a resistance of 25 ohms at 10Íc. Take the temperature coefficient at 10ÍC to be ? = 0.00405ÍC-1. What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%?
A. 60.13Íc
B. 59.38Íc
C. 58.80Íc
D: 59.24Íc
Calculate the inductance in mH required at 1.0 Mhz with a capacitance of 10 picofarad.
A. 3.25
B) 2.53
c. 3.52
d. 5.23
Four wires meet at a junction. The first carries 4 A into the junction, the second carries 5 A out of the junction and the third carries 2 A out of the junction. The fourth carries _____ the junction.
A. 3 A out the junction.
B. 3 A into
C. 7 A into
C. 7 A out
A two-winding transformer has core-losses and full-load copper losses equal to W watts each. It is tested along with another similar transformer for back-to-back test. What is the total power input will be in W?
A. Two
B. One-half
C. One
D. Four
A three-phase transformer is rated 8 MVA, 69.13.4 kV has a series impedance of 7%. What is the new per unit impedance if the system study requires a 100 MVA base and 67 kV base?
A. 1.021
B. 0.891
C. 0.928
D. 0.954
In a series RC circuit, the voltage across the capacitor and the resistor are 60 V and 80 V respectively. What is the total voltage of the circuit?ö
A. 130 V
B. 120 V
C. 140 V
D. 100
Which of the following type of motor is used in electric toys?
A. Split-phase motor
B. Shaded-pole motor
C. Capacitor-start motor
D. Permanent split
For any circuit the number of independent equations containing emf's resistances, and currents, equals the number of ______.
A. branches minus 1
B. junctions
C. branches
D. junction minus 1
What is the instrument often used to check the degree of motor shaft misalignment?
A. Megohmmeter
B. Voltmeter
C. Clamp-on ammeter
D. Dial indicator
A certain voltmeter has internal resistance of 10 k-ö and a range from 0 to 100 V. To give it a range from 0 to 1000 V, one should connect ________.
A. 100 k-ö in series
B. 100 k-ö in parallel
C. 90 k-ö ir. parallel
D. 90 k-ö in series
In the context of the loop and junctions rules for electrical circuits a junction is where _____.
A. a wire is connected to a resistor
B. a wire is connected to a battery
C. three or more wires are joined
D. only two wires are joined
If the potential difference across a resistor is doubled only _______.
A the resistance is halved
B. the current is doubled
C. the current is halved
D. the resistance is doubled
The power loss is MORE consider in the design of _____.
A. a generator
B. a motor
C. the transmission line
D. the feeder
Nine identical wires, each of diameter d and length L, are connected in PARALLEL. The combination has the same resistance as a SINGLE similar wire of length L but whose diameter is _________.
A. 9d
B. 3d
C. d/3
D. d9
In an RLC series circuit, the source voltage is leading the current at a given frequency f. If f is lowered slightly, the the circuit impedance will _______.
A. remain the same
B. need to know the amplitude of the source voltage
C. decrease
D. increase
Three equal impedances Za = Zb = Zc = 4- j 7 ohm are connected in Wye, find the equivalent impedance in ohm if these impedances are connected in delta.
A. 4 - j 7
B. 6 - j 14
C. 12 - j 21
D. 2.31 - j 4.04
A certain voltmeter has an internal resistance of 10 k-ö and a range from 0 to 12 V. To extend its range to 120 V, use a series resistance of ______.
A. 108,000
B. 90,000
C. 100,000
D. 120,000
A refrigerator receptacle can be fed from a
I. 15 - ampere individual branch circuit
II. 20 - ampere individual branch circuit
III=. 20 - ampere small. appliance branch circuit
A. II and III
B. II only
C. III only
D. I, II, and III
A 4-pole, 60 H2, 200 V induction motor having a Full-load current of 350 torque developed is 700 n-m. What is the approximate speed of the motor?
A. 870 rpm
B. 955 rpm
C. 1100 rpm
D. 1250 rpm
In a series circuit, the current is ____.
A. Inversely proportional to the resistance
B. variable
C. proportional. to the resistance
D. constant
The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field ? is
A. dependent on the shape of the loop for a fixed loop area
B. maximum when the plane of the loop is perpendicular to B
C. maximum when the plane of the loop is parallel to B
D. independent of the orientation of the lcop
A 20-IF capacitor and a parallel 200-ö resistor draws 4 A at 60 Hz. Find the power consumption.
A. -0.98 + j 1.47 kVA
B. -0.98 - 1.47 kVA
C. 0.98 - j 1.47 kVA
D. 0.98 + j 1.47 kVA
Which of the following statement is FALSE?
A. Interrupts are used to develop RTOS.
B. RIOS performs tasks in predictable amount of time.
C. Kernel is the one component of any OS.
D. Window 98 is RTOS.
The reactance in ohms of a 35. IF capacitor connected to a 400 Ez generator is _____.
A. 0.088
B. 11
C. 0.014
D. 0
Determine the CMR of a three-equal strands conductor in vertical formation in terms of r of an individual strand?
A. 1.6696r
B. 1.7036г
C. 1.8149r
D. 1.9307r
The units of magnetic dipole moment are _______.
A. ampere/meter"
B. ampere-meter
C. ampere-meter"
D. ampere/meter
The value of inductance in three-phase line is ____ times the loop inductance for single-phase line
A. 2
B. 1/2
C. 1/3
D. 3
Which of the following statement 1s CORRECT for Faraday's law?
A. An induced electromotive force is proportional to the rate of change of magnetic field.
B. An induced electromotive force is proportional to the rate of change of electric flux.
C. An induced electromotive force is proportional to the rate of change of magnetic flux.
D. An induced electromotive force is proportional to the rate of change of electric field.
Two wattmeters connected to measure power read W1 = 30 kw and W2 = 55 kW. What is the power factor?
A. 0.918
B. 0.891
C. 0.981
D. 0.819
A 15ö resistor is connected in parallel with a series combination of resistors of 8 and 12 ö • If the voltage drop across the 8 ö resistor is 48 V, what is the total voltage applied?
A. 110 V
B. 120 V
C. 130 V
D. 140 V
A light source located 2.75 m from the surface produces an illumination of 528 lux on that surface. Find the illumination in lux if the distance is changed to 1.55 m.
A. 937
B. 1,298
C. 658
D. 1,662
A cylindrical copper rod has resistance R. It is reformed to twice it original length with NO change of volume. What its new resistance ?
A. 4R
B. 2R
C. 6R
D. 3R
DC was created by the Energy Regulatory Commission to monitors the compliance of the distribution utilities to the PDC. DMC stands for
A. Distribution Market Committee
B. Distribution Maragement Commission
C. Distribution Management Committee
D. Distribution Market Commission
The lighting load for an office building expressed in terms of a unit load in volt-amperes per square meter must be at least
A. 24
B. 32
c. 28
D. 16
The starting current of the transformer is generally tines of its rated full load current.
A 20
B. 1.2
C. 10
D. 6
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs _____.
A. far from the sphere
B. at the surface
C. just outside the surface
D. at the center
What is the primary function of the tubes welded on the side af oil-type transformers?
A. For transformer losses reduction.
B. To improve the cooling.
C. To increase its efficiency.
D. For voltage regulation improvement
Suppose that the fundamental dimesions are taken to be : force (F), velocity (V) and time (T). What are the dimensions of potential energy?
A. F/T
B. FVT
C. FV/T
D. F/T2
What is the rms value of an AC current?
A. That steady current that will charge a battery at the same rate ad the actual current.
B. Its average value.
C. Its peak value.
D. The steady current that produces the same rate of heating in a resistor as the actual current.
What is/are the reasons for using high-voltage in the transmission of power in the grid?
I. To transmit large amount of power with minimum line losses
II. To increase the system reliability
A. I
B. Either I or II
C. II
D. Both I and II
When the amplitude of the oscillator in a series RLC circuit is doubled the _____.
A. capacitor reactance is halved
B. impedance is doubled
C. current amplitude is doubled
D. the voltage across the capacitor is halved
A 3-H inductor has 2000 turns. How many turns must be added to increase the inductance to 5 H?
A. 025 turns
B. 582 turns
C. 2582 turns
D. 2825 turns
A 100 kVA, 20/5 kV transformer has an equivalent impedance of 10%. Calculate the impedance (in ohm/s) of the transformer refered to the 5 kV side.
A. 400
B. 50
C. 200
D. 25
The protection against overvoltage due to lightning is/are provided by _____.
i. Used of overhead groundwires
ii. Used of surge arresters
A. ii only
B. i only
C. either i or ii
D. both i and ii
A 10 kVA, 200/400 V single-phase transformer is operating with secondary open circuited. What is the input current in amperes?
A. 50
B. 2
C. 20
D. 10
In a purely inductive circuit, the current lags the voltage by _____.
A. one-half of a cycle
B. one cycle
C. three-fourths of a cycle
D. one-fourth of a cycle
In practice, the three phase conductors of a three-phase line are seldom equilaterally spaced. The usual nonsymmetrical spacing produces unequal inductances in the three phases, leading to unequal voltage drops and imbalance in the line. To offset this imbalance, the positions of the conductors are interchanged at regular intervals in the line. This practice is known as
I. Transposition
II. Interchange
A. Either I or II
B. II
C. Both I and II
D. I
Which of the following refers to the power loss due to magnetization and demagnetization of the core alternating material?
A. No-Load Loss
B. Bddy-current Loss
C. Hysteresis Loss
D. Copper Loss
Which of the following is NOT part of your unbundling rate in your Meralco electric bill?
A. Distribution
B. Supplier
C. Transmission
D. Generation
A belt-driven generator supplies 875 kW at 90% efficiency. The loss in the drive belt is 2.5%. Calculate the horsepower of the engine needed to drive the generator.
A. 1353
B. 1346
C. 1336
D. 1363
A golf ball is struck by a golf club and falls on green three meters above the tee. The potential energy of the Earth-ball system is greatest __________.
A . just before the ball is struck
B. when the ball reaches the highest point in its flight
C. when the ball comes to rest on the green
D. just after the ball is struck
For a given base voltage and base VA, the per unit impedance value of an element is "x". What will be the per unit impedance value of this element when the voltage and VA bases are both doubled?
A. 1/4x
B. 1/2 x
C. 2x
D. 4x
An inductive load consisting of R and X in series feeding from a 2.4 kV supply absorbs 288 kW at a lagging power factor of 80%. Determine R and X.
A. R = 21.8 ö and 6.9 ö
B. R = 9.6 ö and 12.8 ö
C. R. = 12.8 ö and 9.6 ö
D. R = 18.2 ö and 16.9 ö
The bull's eye of the grounding target is located at the _______.
A. metering
B. transformer
C. service
D. connection
Two soils have self-inductance of 5H and IH, the mutual inductance being zero. If the two coils are in series, what is the total inductance will be? A. 5 H 6 H B. 4 H D. 12 H
A. 5 H
B. 4 H
C. 6 H
D. 12 H
Why is the core lossess are negligible during a short-circuit test conducted on transformer?
A. Power factor is high
B. Frequency is low
C. The mutual flux is small
D. Current is high
What is the equivalent value of this expressior: aj + a^2 in rectangular form?
A. 1.366 - j 1.366
B. -1.366 + j 1.366
C. 1.366 + j 1.366
D. -1.366 - j 1.366
Which of the following is the electrical device that is usually required to be installed in moisture area in the dwelling unit in order to protect the person from electric shock?
A. Circuit Breaker
B. Arc-Fault Circuit Interrupter
C. Power Fuse
D. Ground-Fault Circuit Interrupter
Which of the following instrument is used to measure high resistance as in the measurement of insulation resistance?
A. Wheatstone bridge
B. Megger
C. Ohmmeter
D. Multi-tester
Which of the following is the correct statement about coulomb?
A. The quantity of charge that will exert a force of 1 N on a similar charge at a distance of one meter.
B. One ampere per second
C. An abbreviation for a certain combination of kilogram, meter and second.
D. The amount of current of charge that flows past a point in one second when the current is one ampere.
A certain amount of fuel contains 15 x 1010 Btt of energy. What is the corresponding energy in kilocalories?
A: 3.52 x 10^10
b. 3.87 x 10^10
C. 3.25 x 10^1C
D 3.78 × 10^1C
he number of address lines requires to address a memory of size 32 K is _____ lines
A. 18
B. 16
C. 13
D. 15
What is the effects on current flow in reversing the direction of movement of a conductor in the magnetic field o a generator?
A. Will increase the current flow.
B. Has no effect on the current flow.
C. Neutalize the current flow.
D. Reverse the direction of the current flow.
which of the following 1s a variable renewable energy (VRE)?
A. Gas turbine
B. Solar plant
C. Coal plant
D. Diesel plant
An autotransformer is used to connect a 13.2 kV distribution line to a 13.8 kV distribution line. It must be capable of handling 2000 kVA. There are three phases connected Y-Y with their neutral solodly grounded. What must be she Nc/Nse turn ratio to accomplish this connection?
A. 24
B. 20
C. 26
D. 22
One of the following is NOT a basic part of oil-type power transformer.
A. Radiator
B. Primary bushings
C. Oil drum
D. Load tap changer
maganda ba si june pearl santos ulip?
yes
ofcourse
why no coconut
YES GORL LESGOW GUDLAK MGA GINGENEER
