# Electrical Engineering Mastery Test 1 | REE Pre-Board Exam

(Last Updated On: January 28, 2024)

This is the Pre-board Exams in Electrical Engineering 1 composed of previous REE Board Exams Questions and cautiously selected questions from various topics in Communications that could possibly be given in the board. Choose, familiarize, and test yourself so that you will know the taste of the Board Exam Questions. Read each questions and choices carefully! Choose the best answer.

#### Start Pre-board in Electrical Engineering Mastery Test 1

Choose the letter of the best answer in each questions.

1. A current of 5 amperes flows through a series circuit consisting of a 10-ohm resistor and an unknown capacitor across a source of 460 volts, 50 hertz. What is the value of the capacitive reactance?

A. Xc = 91.86 ohms

B. Xc = 39.19 ohms

C. Xc = 154.45 ohms

D. Xc = 184.00 ohms

Solution:

2. A chart speed of a recording instrument is 25 mm/sec. One cycle of the signal being recorded extends over 5 mm. What is the frequency of the signal?

A. 20 cycles per sec

B. 2 cycles per sec

C. 50 cycles per sec

D. 5 cycles per sec

Solution:

3. A six-pole, 3 phase AC generator has 72 slots, the coil span is 12, what is the pitch factor.

A. 1.000

B. 0.939

C. 0.985

D. 0.966

Solution:

Solution: What is the pitch factor?

4. A coaxial cable has 10-mm diameter inside conductor and a metallic sheath with an inside diameter of 20 mm. If the insulating medium has a dielectric constant, K = 2 and a permittivity of 1.113 x 10-10 , what is the capacitance between the conductor and the shield per km?

A. 1.1604 mfd/km

B. 0.8036 mfd/km

C. 0.0803 mfd/km

D. 0.0403 mfd/km

Solution:

5. Of the various methods of utilizing the heat from the sun, one appears to be most efficient so far. Which one is this?

A. Self-contained collector

B. mirror and tracking system

C. Direct application of lenses

D. Flat plate collector

Solution:

6. A single phase transformer is rated 4,160 V primary and 250 volts ‘secondary. It has 1,500 turns in the primary and voltage regulation of 8%. What should be the number of turns in the secondary winding?

A. 83 turns

B. 92 turns

C. 90 turns

D. 86 turns

7. A germanium diode which has an offset voltage of 0.2 V and an incremental resistance of 20 ohms, is connected in series with a 10,000 ohm resistor across a 100 VDC source. What is the current?

A. 9.98 mA

B. 10.0 mA

C. 9.78 mA

D. 9.96 mA

Solution:

8. A self-excited four-pole AC generator, 12.5 KVA, 60 Hz, was reinstalled after it was rewound. When tested at 1,200 rpm, the voltage would not build up. What could be the most likely reason?

A. The field winding circuit is open

B. The direction of rotation is reversed

C. The speed is low

D. The armature winding terminal connection is reversed

Solution:

9. A wire carries a current,. i = 3 cos 314 t amperes. What is the average current over 6 seconds?

A. zero ampere

B. 1.5 A

C. 3.0 A

D. 0.523 A

Solution:

10. 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 permeability

D. To reduce eddy currents

Solution:

11. Which of the following gaseous fuels has the highest heating value?

A. Producer gas

B. Hydrogen gas

C. Natural gas

D. Butane gas

Solution:

12. Which of the following affect the overall efficiency of a lighting installation?

A. Age of the lamp

B. Dust and dirt

C. Voltage

D. All of these

Solution:

13. A simple half wave rectifier consists of a diode and load. If the internal resistance of the diode is 1 ohm and the load is 5 ohms, what is the DC load current if the supply voltage is 12 volts AC?

A. 2.7 A

B. 2.4 A

C. 2.0 A

D 3.6 A

Solution:

14. Because it receives electrons, a P-Type semi-conductor s called what?

A. Receptor

B. Preceptor

C. Donor

D. Acceptor

Solution:

15. The electromotive force of a standard cell is measured with a potentiometer that gives a reading of 1.3563V. When a 1.0 meg ohm resistor is connected across the standard cell terminals, the potentiometer reading drops to 1.3560 V. What is he internal resistance of the standard cell?

A. 174.5 ohms

B. 145.7 ohms

C. 147.5 ohms

D. 157.4 ohms

Solution:

16. Across a 230-V 60 Hz power supply is a 15-ohm non-inductive resistor. What is the equation of the resulting current?

A. I = 398.4 sin 60t

B. 1= 325.2 sin 377t

C. I = 230 sin 377t

D. I = 230 sin 120t

Solution:

17. The Philippines has adopted one of the following primary color television transmission standards. Which one is this?

A. PAL

B. NTSC

C. EUREKA

D. SECAM

Solution:

18. A 20-hp, 110 V DC shunt motor has an efficiency of 88% an exciting current of 4 amperes and an armature resistance of 0.04 ohm. What starting resistance is required for full load torque?

A. 0.98 ohm

B. 0.94 ohm

C. 0.95 ohm

D. 0.46 ohm

Solution:

19. The resistor is connected across an AC supply of 220 volts. The power drawn is 1000 watts. If a diode were connected in series with the resistor, what would be the power absorbed by the resistor?

A. 850 watts

B. 250 watts

C. 200 watts

D. 500 watts

Solution:

20. An effective remover of dusts, carbon particles and others from the fuel gas of the power plant is:

A. Electrostatic precipitator

B. Mechanical collector

C. Soot blower and collector

D. Dust scrubber

Solution:

21. The phase shift between the voltage and current vectors is due to the following loads EXCEPT one. Which one is this?

A. Magnet coils

B. Electric flat irons

C. Power capacitor

D. Fluorescent lamps

Explanation:

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22. Double-bus double-breaker scheme has the following characteristics EXCEPT one. Which one is this?

A. Even with a circuit breaker failure, a station shutdown will not result.

B. It reduces the likelihood of extended outages of any circuit due to circuit breaker trouble.

C. It permits breaker maintenance without feeder outage.

D. It gives more flexibility.

Solution:

23. Which of the following statements regarding Rankine Cycle is NOT true?

A. The temperature at which energy is transferred to and from the working liquid are less separated than in a Carnot Cycle.

B. The susceptibility of the engine materials to corrosion is not a key on operating efficiency.

C. Superheating increases the efficiency to the Rankine Cycle.

D. Use of a condensible vapor in the cycle increases the efficiency of the cycle.

Solution:

24. A circuit consisting of three resistors rated: 10 ohms 15 ohms and 20 ohms are connected in DELTA. What would be the resistance of the equivalent WYE connected load?

A. 0.30, 0.23 and 0.15 ohm

B. 3.0, 4.0 and 5.0 ohms

C. 3.33, 4.44 and 6.66 ohms

D. 5.77, 8.66 and 11.55 ohms

Solution:

25. Tubes are preferred to transistors in the following functions EXCEPT one. Which one is this?

A. High power

B. High voltage

C. High frequency

D. Long life

Solution:

26. 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

Solution:

27. A permanent magnet is one when the materials 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

Solution:

28. In the computation of the size of building wire, the PEC requires that at least a certain percent increase must be added. What percent is this?

A. 20%

B. 15%

C. 50%

D. 25%

Solution:

29. Surge arresters are needed in transmission line for the following purpose. Which is the important?

A. Regulate the voltage

B. Prevent the lighting from striking the line

C. Protect the system front high voltage transients

D. Protect the line from short circuit currents

Solution:

30. What applications are compositions resistors used for?

A. Potentiometers

B. Electronic Circuits

C. Power resistors

D. Field rheostats

Solution:

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

A. Thermocouple

B. Dynamometers

C. Moving iron vane

D. Oscilloscope

Solution:

32. A 170 kV, 3-phase electric source delivers 200 MVA to a balanced load which has a power factor of 90% lagging. What is the line current?

A. 257 A

B. 502 A

C. 402 A

D. 679 A

Solution:

33. In transmission lines, the most effective protection against lightning strikes is one of the following. Which one is this?

A. Lightning rods

B. Lightning arresters

C. Petersen coils

Solution:

34. What does a voltmeter indicate?

A. Total current

B. Coulombs per second

C. Potential difference

D. Resistance per meter

Solution:

35. A VAR meter depends on the following values EXCEPT one. Which one is this?

A. Voltage

B. Sine of the phase angle

C. Cosine of the phase angle

D. Current

Solution:

36. What causes electric current to flow in a vacuum tube?

A. Repulsion of protons by the cathode

B. Attraction of protons to the anode

C. Space charge

D. Repulsion and attraction of electrons by the charged object

Solution:

37. In the SI system, one of the following is NOT in SI unit. Which one of this?

A. Candela

B. Fahrenheit

C. Newton

D. Kilogram

Solution:

38. A DC generator has a non-load output voltage rating of 120 volts. Its armature circuit resistance is 0.95 ohm and its field coils arc separated energized. if a load rated at 2 KW at 115 volts is connected across the output, neglecting the effects of armature reaction and line drops, what power would be absorbed by the load?

A. 1,670 watts

B. 2,180 watts

C. 2,000 watts

D. 1,518 watts

Solution:

39. The transfer bus scheme has the following characteristics EXCEPT one. Which one is this?

A. It allows the disconnection of circuit breakers for maintenance without interrupting the service

B. It is more flexible

C. It allows better continuity of service as compared with the single bus .

D. It is ore costly than that of the single bus system

Solution:

40. Two electrons in a vacuum experience a force of 2 x 10-15 N. How far apart are the electrons?

A. 0.48 x 10-7 m

B. 9.60 x 10-7 m

C. 2.84 x 10-12 m

D. 5.05 x 10-12 m

Solution:

41. If a resistor rated at 5 watts and 6 volts are connected across a battery with an open circuit voltage of 6 volts. What is the internal resistance of the battery if the resulting current is 0.8 A?

A. 0.30 A

B. 0.26 A

C. 0.23 A

D. 0.03 A

Solution:

42. Determine the power angle in the series circuit which consists of R = 25 ohms, I. = 0.2 H across a power supply of 200 volt; 30 Hz?

A. 36.4 deg

B. 52.4 deg

C. 46.4 dcg

D. 56.4 deg

Solution:

43. A load of 10,000 KVA, 80% lag is connected to a 13,200 volt line. How much capacitive reactive power is needed to correct the power factor to 0.97 lagging?

A. 5,156 kVAR

B. 3,138 WAR.

C. 2,547 kVAR

D. 4,753 kVAR

Solution:

44. What arieleetrons in motion called?

A. Current variation

B. Electric current

C. Electron velocity

D. Dynamic electricity

Solution:

45. A load of 10 MVA , 0.8 p.f lagging, 22 kV is served by a transmission line which has a line resistance of 3 ohms and a line reactance of 10 ohms. Solve for the sending end voltage?

A. 26,721 V

B. 22,433 V

C. 25,206 V

D. 24,214 V

Solution:

46. Electromotive force is usually measured in what unit?

A. Newton

B. Volt

C. Kilogram

D. Amperes

Solution:

47. Inverters are electrical devices usually consisting of switches transformer, inductors and capacitor. What are they used for?

A. To change DC voltage to another DC voltage

B. To change AC sinusoidal wave to AC pulsed wave

C. To convert DC voltage to AC voltage

D. To change AC voltage to DC voltage

Solution:

48. A resistor assembly for a wound rotor motor consists of 20 elements of cost iron grid elements. The rating of each is 0.10 ohm. When joined in series and tested across 220 volts, the measured current was 100 A. How much power was lost in the joints?

A. 1.9 kW

B. 1.8 kW

C. 2.0 kW

D. 2.1 kW

Solution:

49. A conductor 50 mm long, moves at a velocity of 2.5 meters per second across a magnetic field of 0.90 W/m2. What is the voltage generated?

A. 0.125 V

B. 0.0648 V

C. 0.1125 V

D. 0.072 V

Solution:

50. A circuit consists of three resistor rated 3,4, and 5 ohms and connected in parallel. If this circuit is connected to a battery which has an internal resistance of 0.2 ohm. What would be the current passing through the ohm resistor?

A. 2.04 A

B. 4.8 A

C. 2.4 A

D. 3.0 A

Solution:

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