EE TERMS , EE OBJECTIVES PART 2, EE OBJECTIVES PART 3, EE OBJECTIVES MODULE 1, ESAS OBJECTIVE TYPE, EE OBJECTIVES - 2026, EE OBJECTIVES, EE PREBOARD - EE REV

EE TERMS , EE OBJECTIVES PART 2, EE
OBJECTIVES PART 3, EE OBJECTIVES MODULE 1,
ESAS OBJECTIVE TYPE, EE OBJECTIVES - 2026, EE
OBJECTIVES, EE PREBOARD - EE REV
1. A 220 volts dc series motor when running at 800 rpm draws a current of 100 A. The combined
resistance of the armature and the field is 0.1 ohm. What is the speed when the motor develops one-
half the original torque?
A. 1600 rpm
B. 1147 rpm
C. 1690 rpm
D. 1225 rpm - Correct Answer -B. 1147 rpm

2. The following are the given loads of a particular circuit: 5- 15 hp motors, 3- 5 hp motors, 8 kW lighting
loads, 3.5 kW miscellaneous load. Calculate the maximum demand if the demand factor is 65%
A. 78.64
B. 51.12
C. 45.81
D. 120.98 - Correct Answer -B. 51.12

3. Its primary function is to provide ground source.
A. Zig-zag transformer
B. Surge arrester
C. Sectionalizer
D. Tertiary transformer - Correct Answer -A. Zig-zag transformer

4. Why are transmission tower sometimes constructed in lattice type and sometimes in pole type
although they have the same capacity and voltage rating?
A. Reliability
B. Right of way
C. Wind load
D. Safety - Correct Answer -B. Right of way

5. A 100 watts 230 volts gas fitted lamp has a mean spherical candle power of 92. Find its efficiency in
lumens per watt.
A. 11.56
B. 22.34
C. 19.56
D. 28.03 - Correct Answer -A. 11.56

6. With the primary of CT energized, the secondary must never be made open to prevent this to happen.




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,A. Build-up of magnetic bias
B. Burning of the secondary winding
C. Burning of the primary winding
D. Absence of induced voltage - Correct Answer -A. Build-up of magnetic bias

7. A 25 miles (40 km), 3-phase, 3-wire sub-transmission line with an impedance per conductor of 7.65 +
j16.52 ohms is supplying a balanced 3-phase load of 4000 kW, 33500 volts line-to-line, 60 Hz at 0.8 pf
lagging. The conductors used in the line are 336.4 MCM, ACSR, 26/7 strands vertically spaced 4.5 ft
apart. If a 2100 kVAR, 3-phase, pure capacitor bank is installed across the load, what is the voltage dip
maintaining 33500 volts at the receiving end?
A. 735 v
B. 585 v
C. 635 v
D. 485 v - Correct Answer -B. 585 v

8. A symmetrical cable with 200 meters span has a unit weight of 2 kgf per meter uniformly distributed
along the horizontal. The tension at the lowest point is 2000 kgf. Find the tension at the supports in kgf.
A. 2010
B. 4080
C. 2040
D. 2000 - Correct Answer -A. 2010

9. The positive-sequence components of the system has ___.
A. The same phase sequence as the original
B. The opposite phase sequence as the original
C. Zero-phase displacement
D. Both A and B - Correct Answer -A. The same phase sequence as the original

10. A south pole 20 unit pole is placed one inch away from another south pole 35 unit pole. What is the
force between the two poles in dynes?
A. 108.5 repulsion
B. 70 repulsion
C. 108.5 attraction
D. 70 attraction - Correct Answer -A. 108.5 repulsion

11. In a 34.5 kV three-phase system, the Thevenin's equivalent impedances are: positive impedance, Z1
= 0.015 p.u. at 50 MVA; zero impedance, Z0 = 0.03 p.u. at 50 MVA. What is the phase-to-phase fault
current?
A. 48000 A
B. 8400 A
C. 80000 A
D. 32000 A - Correct Answer -A. 48000 A




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,12. What is the intensity E in millivolts per meter of an omnidirectional antenna over a distance of 1 km
if the power is 1 kW. Impedance of free space is 120.
A. 153.41
B. 199.45
C. 167.81
D. 173.32 - Correct Answer -D. 173.32

13. A magnetic circuit consists of silicon steel of 2000 permeability of 10-cm length and cross-sectional
area of 22 cm2 and an air gap of the same cross sectional area and of 1 cm length. One ampere current
flows through 500 turns of coil. Calculate the field intensity across the air gap.
A. 622 Oersted
B. 590 Oersted
C. 755 Oersted
D. 350 Oersted - Correct Answer -A. 622 Oersted

14. A relay coil carries a polarizing current of 1 A DC and a signal AC current of 3A at 50 Hz. If the coil
resistance is 5 ohms, power dissipated by the coil is ____ watts.
A. 50
B. 5
C. 80
D. 45 - Correct Answer -A. 50

15. For a 4-pole dc generator, having a progressive simplex 2-layer wave-winding with 30 conductors,
the commutator pitch is ____.
A. 8
B. 10
C. 9
D. 11 - Correct Answer -A. 8

16. A 40-mile, 60-cycle three-phase line consists of three 000 conductors spaced 5 ft apart. The diameter
of 000 wire is 410 mils. Determine the charging current if the voltage between the wires is 33 kV.
A. 5.82 A
B. 2.58 A
C. 4.53
D. 8.24 A - Correct Answer -C. 4.53

17. The auxiliary winding of a split phase induction motor is switched out of the circuit by a device called
_____.
A. Magnetic contactor
B. Centrifugal switch
C. Zero-speed switch
D. Limit switch - Correct Answer -B. Centrifugal switch




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, 18. A 200-kVA transformer has an impedance of 15% and the power factor of the load is 85%. The
primary voltage is 6000 volts while the copper loss is 15 kW. Find the percent voltage regulation.
A. 13.49%
B. 8.91%
C. 15.78%
D. 23.67% - Correct Answer -A. 13.49%

19. The rotor poles of an 8-pole synchronous generator shift by 10 mechanical degrees from no load to
full-load. Calculate the torque angle between the excitation voltage E0 and the terminal voltage Vo at
full-load.
A. 5 deg
B. 20 deg
C. 10 deg
D. 40 deg - Correct Answer -D. 40 deg

20. A transformer is designed to carry 30 times its rated current for 1 second. The length of time that a
current of 20 times the rated current can be allowed to flow is ____.
A. 0.67 sec
B. 1.5 sec
C. 2 secs
D. 2.25 sec - Correct Answer -D. 2.25 sec

21. The transformer used to serve a customer is rated 5 MVA, 13.8 kV/480 v and its impedance is 5%.
The cable connecting the breaker to the transformer has an impedance of 0.032 ohm per phase. What is
the fault current if a three phase fault occurs at the breaker?
A. 8000 A
B. 6000 A
C. 5000 A
D. 1200 A - Correct Answer -A. 8000 A

22. The rotor resistance of an 8-pole, 50 HZ, wound rotor induction motor is 0.5 Ω per phase. The speed
of the motor is 720 rpm at full load. Determine the external resistance to be connected with the rotor
circuit to reduce the speed to 680 rpm for full-load torque.
A. 0.6625 Ω
B. 1.1625 Ω
C. 0.5225 Ω
D. 0.8625 Ω - Correct Answer -A. 0.6625 Ω

23. 87 is the device function number assigned by ANSI to this relay;
A. lock out relay
B. undervoltage relay
C. directional relay
D. differential relay - Correct Answer -D. differential relay




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