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ELECTRICAL ENGINEERING PART 1

Based load power 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 coil of wire having a value of 10 + j16 Ω is connected in series with a capacitive reactance Xc, and this series combination is then connected in parallel with a resistor R. If the equivalent impedance of the circuit is 8 + j0 Ω, what is the value of Xc in Ω?

A transponder with a bandwidth of 400MHz uses polarization diversity. If the wavelength allocated to transmit a single telephone channel is 4 kHz, how many telephone channels can be carried by the transponder?

300,000

400,000

100,00

200,000

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

2:1

1:4

4:1

1:2

A room air conditioner is to be attached to an individual branch circuit. If the load is 12 A, what is the minimum size of the branch circuit required?

15 A

12.8 A

8.7 A

9.6 A

6. The energy that is stored in a 25 microF is W(t) = 12 sin2 (377t) joule. Determine the current in A in the capacitor.

6 cos 377t

6 sin 377t

9.23 sin wt

9.23 cos wt

The amplitude modulation generated at very low voltage or power amplifier is _____________ modulation.

Minimum

Collector

High-level

Low-level

Which of the following type of fault that used only the equivalent positive impedance of the circuit in short-circuit calculations?

Line-to-line fault

Double-line-to-ground fault

Three-phase fault

Single-line-to-ground fault

A washing machine is , in effect, an R-L circuit. If the machine takes 311W and 4.5 A from a 155-V source when operating normally, find its power factor

0.75 lagging

0.65 lagging

0.70 lagging

0.60 lagging

Which of the following defines the meaning of load factor?

a. The ratio of average load to installed capacity

B. The ratio of the maximum load to average load

C. The ratio of average load to maximum load

D. The ratio of connected load to maximum load

If the magnetic flux through a certain region is changing with time,

An emf exists around the boundary

A current must flow around the boundary

An electric field must exist at the boundary

A magnetic field must exist at the boundary

In a capacitor start motor, the capacitor is replaced by an inductor having the same reactance as the capacitor, then the motor will _______.

A. Be damaged

B. Start but run at a slow speed

C. Start and run at its rated speed

D. Not start

The current is zero in a conductor when NO potential difference is applied because __________________.

A. The electrons are not moving fast enough

B. Equal number of electrons and protons are moving together

C. The electrons are not moving

D. For every electron with a given velocity, there is another with a velocity of equal magnitude and opposite direction

Which of the following transformer has only one winding?

A. current

B. distribution

C. auto-transformer

D. power

Which of the following AC device is used to measure the angle between the voltage and its current?

A. Reactive meter

B. Power factor meter

C. Demand meter

D. Phase angle meter

A flux of 13.6 mWb penetrates a coil of wire 240 mm in diameter. Find the magnitude of the magnetic flux density in Tesla if the plane of the coil is perpendicular to the field.

A. 0.3

B. 0.8

C. 0.4

D. 0.5

A resistor with resistance R1 and a resistor with resistance R2 are connected in parallel to an ideal battery with emf V. What is the rate of thermal energy generation in the resistor with resistance R1?

V2/R2

V2/R1

V2R1/(R1+R2)2

V2(R1 + R2)

The grounded conductor is a/an _________ grounded conductor.

Isolated

Guarded

Insulated

Intentionally

The resistance of a rod does NOT depend on ___________.

A. The shape of its cross-sectional area

B. Its length

C. Its material

D. Its temperature

A common utility’s tariff practice to penalize industrial consumers whose power factor falls below _____ and give incentives for power factor above ____.

A. 80%, 90%

B. 75%, 90%

C. 85%, 85%

D. 75%, 85%

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?

Infinity

Equal to winding resistance

Zero of infinity

Zero

When the amplitude of the oscillator in a series RLC circuit is doubled, the __________________.

A. Current amplitude is doubled

B. The voltage across the capacitor is halved

C. Impedance is doubled

D. Capacitor reactance is halved

Which of the following protective devices operates on the principle of Kirchhoff’s Current Law?

A. Instantaneous overcurrent relay

B. Differential protective relay

C. Undercurrent relay

D. AC time overcurrent relay

Which of the following will the effect of the electric shock in the human depend on?

A. Voltage flowing in the body

B. Line power

C. Current flowing on the body

D. Resistance of the line

The coulomb force F, acts on two charges a distance, r, apart. What is F proportional to?

A. r

B. 1/r^2

C. r^2

D. 1/r^3

An LC series circuit with an inductance L and capacitor C has an oscillation frequency of f. Two inductors, each with inductance L, and two capacitors, each with capacitance C, are all wired in series and the circuit is completed. The oscillation frequency is _______.

A. f/4

B. f

C. 2f

D. f/2

Approximately how far must an isolated positive point charge of 1 x 10^(-8) C be in order for it to produce an electric potential of 100 V? The charge is in free space with e = 8.85 x 10^(-12) C^2/N*m^2.

A. 8.6 m

B. 0.90 m

C. 1.2 m

D. 5.3 m

Which of these is NOT a simplex type of electronic communication?

A. TV broadcasting

B. Facsimile of fax

C. Paging services

D. Telephone

A good example of kinetic energy is provided by

A. A tornado

B. A wound clock spring

C. An automobile storage battery

D. The raised weights of grandfather’s clock

A 60 Hz alternator has a speed of 300 rpm. How many poles has it?

Current has a unit of ________.

A. coulomb

B. ohm

C. coulomb/second

D. volt

A stationary conducting loop with an internal resistance of 0.5 ohm is placed in a time-varying magnetic field. When the loop is closed, a current of 5 A flows through it. What will the current be if the loop is opened to create a small gap and a 2-ohm resistor is connected across its open ends?

2 A

1 A

4 A

3 A

The reading of the wattmeter will be the same in the two-wattmeter method when ________.

Load in one phase is zero

Power factor is 0.50

Power factor is unity

Neutral is grounded

Modern locomotives are powered by DC motors driven by DC generators, Those are, in turn, driven by diesel engines. Which of the following is the reason for using such a configuration instead of AC generator-motor sets?

The DC equipment is significantly less expensive

The DC configuration provides high torque and good incremental power at low speeds and perform equally well at high speeds

Historically, the DC engines configuration has been used. There is no reason to change this.

By using DC equipment, the power factor problems associated with AC equipment are avoided

What is the main reason that alternating current replaced direct current for general use?

A. AC voltages conveniently transformed

B. AC generators do not need slip rings

C. AC minimizes magnetic fields

D. A given AC current does not heat up power lines as much as the same as DC current

A loop of wire carrying a current of 2 A is in the shape of a right triangle with two equal sides, each 15 cm long. A 0.70 T uniform field is parallel to the hypotenuse. What is the resultant magnetic force on the two equal sides?

A. zero

B. 0.41 N

C. 0.21 N

D. 0.31 N

What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method?

A. 1 p.u.

B. 10 p.u.

C. 3 p.u.

D. 5 p.u.

Which of the following is NOT a reason why single-phase induction motor run?

A. Two windings displaced form each other

B. hysteresis

C. One of the currents is made out of phase between the lines

D. Shaded poles

Which of the following is normally a controlled grounding path for current flow?

A. High impedance circuit

B. Capacitive circuit

C. Parallel circuit

D. Series circuit

The hazards exist only during the period of time the ________ is there.

A. short-circuit

B. switching

C. lightning

D. fault

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

What is the function of the surge tank in hydropower plant?

A. Relieve water hammer pressures in the penstock pipe

B. Produce surge in the pipe line

C. Relieve water pressure in the boiler

D. Supply pressure at constant temperature

Which of the following is NOT a property of magnetic field lines?

A. The field is stronger where the lines are closer together

B. The lines intersect surfaces of equal intensity at right angles

C. Magnetic field lines have no beginning and no ends

D. The lines cross themselves only at right angles

In an oscillating LC circuit, the total stored energy is U. The maximum energy stored in the capacitor during one cycle is _____.

A. U/2

B. U

C. U/2π

D. U/π

What is the function of protection relays in the protection scheme?

A. Switching device

B. Breaking device

C. Time delay device

D. Sensing device

What is the electrical analog of a spring constant “k”?

A. 1/C

B. L

C. C

D. 1/L

Which of the following transformer winding connection is MOST suitable for an unbalanced load?

A. open-delta

B. three-wye

C. four-wye

D. delta

Which of the following instrument is suited for high frequency measurements?

A. Dynamometer

B. Oscilloscope

C. Moving iron vane

D. Thermocouple

Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs

A. Far from the sphere

B. At the center

C. Just outside the surface

D. At the surface

Two wires of the same material have the same length 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. Current density

C. voltage

D. end-to-end potential difference

The tesla is a unit of ____________.

A. inductance

B. Magnetic flux density

C. capacitance

D. permittivity

Which of the following limits the number of coils that may be placed on the armature of a DC motor or generator?

A. Coil to coil arcing due to breakdown of insulation

B. The sizes of the load on the motor

C. The type of winding used

D. The number of poles

What is the allowable rating for branch overload protection if fuse is used for a hermetic motor compressor with a rated load current of 37 A?

A. 30 A

B. 25 A

C. 35 A

Two 110-V light bulbs, one “25W” and the other “100W” are connected in series to a 110 V source. Then, which of the following statement is correct with regard to above sentence?

The current in the 100-W bulb is less than that in the 25-W bulb

Each bulb will have a potential difference of 55 V

The current in the 100-W is greater than that in the 25-W bulb

None of these

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

Two resistors are connected in parallel across a potential difference. The resistance of resistance of A is twice that if 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/4

D. I/2

The growth rate of the energy consumption in our country is 6.9%. In how many years will the energy be quadrupled?

Which of the following is/are the MOST important factor/s to considered in the selection of fuel for power plants? I. Cost of fuel II. Calorific value of fuel

I only

Either I or II

II only

Both I and II

If an appliance has a motor load of 12-A and a heating load of 15-A. That is required ampacity of the branch circuit conductors?

35 A

25 A

20 A

30 A

The government agency created under Presidential Decree 269, whose additional mandates include preparing electric cooperatives in operating and competing under a deregulated electricity market.

A. National Electrification Administration

B. National Electrification Commission

C. National Grid Corporation

D. National Power Corporation

Suppose that the fundamental dimensions are taken to be force (F), velocity (V) and time (T).

F/t

FVT

FV/t

F/T^2

What is the rms value of an AC current?

The steady current that will charge a battery at the same rate and the actual current

Its average value

Its peak value

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

Which of the following instrument is used to measure high resistance as in the measuring of insulation resistance?

Wheatstone bridge

Megger

Ohmmeter

Multi-tester

The bull's eye of the grounding target is located at the

Metering

Transformer

Service

Connection

A golf ball is struck by a golf club and fall on green three meters above the tee. The potential energy of the earth-ball system is greatest

Just before the ball is struck

When the ball reaches the highest point in its flight

When the ball comes to rest on the green

Just after the ball is struck

Which of the following is NOT part of your unbundling rate in your Meralco electric bill?

Distribution

Supplier

Transmission

Generation

Which of the following refers to the power loss due to alternating magnetization and demagnetization of the core material?

No-load loss

Eddy-current loss

Hysteresis loss

Copper loss

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

The resistance of the primary coil of well-designed 1:10, step-down transformers 1-ohm. With the secondary circuit open, the primary is connected to a 12V AC generator. What is the primary Current?

A. About 12 A

B. Depends on the core material

C. About 120

D. Essentially zero

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 has the greatest effect in decreasing the Oscillation frequency of an LC circuit? Using instead ______?

A. L/2 and 2C

B. 2L and C/2

C. 2L and 2C

D. L/2 and C/2

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 Motoring

B. Net Metering

C. Market Matering

D. Import-Export Metering

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.

All grounding connections are made _______and electrically ______.

A. temporary, non-continuous

B. permanent, continuous

C. Temporary continuous

D. permanet, non-continuous

The size of the sole connection of a grounding electrode 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 copper

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

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

In the context of the loop and junctions rules for electrical circuits a Junction is where _____________.

A. Wire is connected to a resistor

B. Wire is connected to a battery

C. Three or more wires are joined

D. Only two wires are joined

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. d/9

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

Which of the following statement is FALSE?

A. Interrupts are used to develop RTOS.

B. RTOS performs tasks in predictable amount of time.

C. Kernel is the one component of any OS.

D. Window 98 is RTOS.

A cylindrical copper rod has resistance R. It is reformed to twice its original length with NO change of volume. What its new resistance?

A. 4R

B. 2R

C. 6R

D. 8R

In PEC it is defined as installations underground or in concrete slabs or masonry in direct contact with the earth, and locations subject to saturation with water or other liquids such as vehicle washing areas, and location exposed to weather and unprotected.

A. Damp location

B. Dry location

C. All location

D. Wet location

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