electrical engineering terms (guarina)

Electrical Engineering Terms

1. Storage battery or secondary cell for storing electricity.

a. Accumulator b. Acidc. Ballastd. Battery Backup

2. An apparatus for the comparison of A.C. voltages. Balance requires both the magnitude and the phase angle of the unknown voltage to be balanced with the known voltage. This may be done either in cartesian form or in polar form.

a. Ballistic Galvanometerb. Alternatorc. A.C. Potentiometerd. Barometer

3. An element capable of generating electrical energy.

a. Alkalineb. Active Filterc. Active Filterd. Active Element

4. Any filter using an op amp is called an

a. Autorecloseb. Bandstop Filterc. Bandpass Filterd. Active Filter

5. Reciprocal of impedance. Ratio of the electric current to the voltage. [Unit: Siemens or S]

a. Conductanceb. Resistancec. Admittance d. Impedance

6. A systematic mathematical procedure which enables a problem to be solved in a definite number of steps.

a. Algorithm b. Alphanumericc. Algebraic Sumd. Analogy

7. A current whose instantaneous values reverses in regularly recurring intervals of time and which has alternative positive and negative values, the cycle being repeated continuously. The term is commonly used to refer to sinusoidal waveforms.

a. Current-carrying capacityb. Electric currentc. Direct Current (D.C)d. Alternating Current (A.C.)

8. A machine (generator) for producing alternating currents or voltages.

a. Embedded Generatorb. Alternator c. Electric Motord. Commutator

9. The temperature of the surroundings in which the equipment is used or operated.

a. Color Temperatureb. Ambient Temperaturec. Room Temperatured. Operating Temperature

10. An instrument for measuring electric current.

a. Ohmmeterb. Voltmeterc. Ammeterd. Galvanometer

11. The current-carrying capacity of conductors or equipment, expressed in ampere.

a. Ampacity b. Ampere Hour Capacityc. Base Load Capacityd. None of the above

12. SI unit of electric current. Defined as the current that flows with electric charge of one Coulomb per second.

a. Ampere (A) b. Voltage (V)c. Resistance (R)d. Impedance (Z)

13. The quantity of electricity measured in ampere-hour which may be delivered by a cell or battery under specified conditions.

a. Ampacity b. Ampere Hour Capacity c. Base Load Capacityd. None of the above

14. Formerly used as the unit of magnetomotive force (mmf). It is the product of the number of turns in a coil and the current in amperes which flows through it. [Note: Since turns is not a unit, the SI Unit of mmf is the ampere]

a. Magnetic Forceb. Voltagec. Turn Ratiod. Ampere-Turn (AT)

15. Procedure of expanding the strength of a signal.

a. Bisectionb. Automationc. Amplification d. Amplifier

16. A device or circuit used to increase the power, current, and voltage level of a signal.

a. Bisectionb. Automationc. Amplificationd. Amplifier

17. Maximum or peak value of a quantity or wave varying in an oscillatory manner, measured with respect to the reference.

a. Timeb. Frequencyc. RMSd. Amplitude

18. A digital logic circuit used to implement the ___operation. The output of this circuit is 1 only when each one of its inputs is a 1.

a. AND Gateb. OR Gatec. NAND Gated. NOR Gate

19. A unit used to measure very small lengths, such as wave length. Equal to 10-10m.

a. Angstrom b. Nanometerc. Hertz (Hz)d. Micrometer

20. Rate of rotation about an axis. It is the rate of change of angle with time. It is measured either in revolutions per second, revolutions per minute (r.p.m.) or radians per second (rad/s).

a. Angular Velocity()b. Linear Velocity (V)c. Hertz (Hz)d. Constant Linear Velocity

21. Positive electrode. The element of an electronic device that receives the flow of electrons.

a. Cathodeb. Anodec. Both a and bd. None of the above

22. A device consisting of spaced elements that are used to receive broadcast signals also a system of conductors that radiates and or receives electromagnetic waves (radio waves).

a. Radiob. Transmitterc. Receiverd. Antenna

23. The ________of an alternating current circuit is the product of the rms values of the voltage and the current.

a. Apparent Powerb. Reactive Powerc. Real Powerd. None of the above

24. The coil or coils of an electric motor or generator or of an electric apparatus in which a voltage is induced by a magnetic field.

a. Commutatorb. Shaftc. Armature d. Brushes

25. Cable with a metal protective covering.

a. Armored Cableb. Metallic sheathed cablec. a onlyd. Both a and b

26. A device placed from phase to ground, or phase to phase, whose nonlinear impedance characteristics provide a path for high-amplitude transients.

a. Conservatorb. Bushingc. Arrester d. Armature

27. Especially used with electric machines to denote that the magnetic field and the rotation are not exactly the same.

a. Harmonizeb. Symmetricc. Synchronousd. Asynchronous

28. Unit used for expressing masses of isotopes of elements. 1 ___ = 1.661 x 10-27kg.

a. Atomic Mass Unit (amu) b. Board of Trade Unit or (BOT unit)c. British Thermal Unit (BTU)d. Combined Cycle Unit

29. A device for altering the direction of an electric current.

a. Commutator b. Shaftc. Armature d. Brushes

30. A d.c. motor with both a series connected winding as well as a shunt connected winding. Depending on whether the fields of the series winding and the shunt winding aid each other or oppose each other, they are called cumulative compound or differential compound.

a. Series Motorb. Compound Motor c. Complex Motord. Universal Motor

31. Loss of signal power or amplitude suffered during its transmission through a medium.

a. Distortionb. Attenuatorc. Attenuation d. Avalanche

32. A passive device used to reduce signal strength.

a. Distortionb. Attenuator c. Attenuationd. Repeater

33. A switch that automatically transfers electrical loads to alternate or emergency-standby power sources.

a. Automatic Trip off Switchb. Automatic Relay Switchc. Automatic Return Switchd. Automatic Transfer Switch

34. A feature of certain circuit breakers where they close automatically after a predetermined time after an automatic opening due to a transient fault.

a. Auto-disruptb. Automationc. Auto-Connectd. Auto-Reclose

35. A transformer in which both the primary and the secondary windings share common turns. It provides no isolation.

a. Autotransformer b. Power Transformerc. Potential Transformerd. Current Transformer

36. The contacts of a switching device, in addition to the main current contacts, that operates with the movement of the latter. They can be normally open (NO) or normally closed (NC) and change state when operated.

a. Momentary Contact Switchb. Magnetic Contactc. Auxiliary Contacts d. Actuator

37. The _______ of a periodic waveform is defined by taking the mean value of the full-wave rectified waveform.

a. Average Valueb. Absolute Value c. True Valued. None of the above

38. The emf set up in the coil of an electric motor, opposing the current flowing through the coil, when the armature rotates.

a. Forward emfb. Back emf c. Induced emfd. Artificial emf

39. Flash-over occurring from an object usually at earth potential (such as a tower) to a line conductor due to the potential of the earthed object rising due to lightning.

a. Induced Flashoverb. Artificial Flashoverc. Forward Flashoverd. Back Flashover

40. A three phase voltage or current is said to be _____ when the magnitude of each phase is the same, and the phase angles of the three phases differ from each other by 120o.A star-connected load or a delta-connected load is said to be balanced when the three arms of the star or the delta have equal impedances in magnitude and phase.

a. Unbalanced Three Phaseb. Balanced Three Phasec. Both a and bd. None of the above

41. _______ is an electrical device which is required for all discharge lamps. It limits the current through the lamp, preventing damage to both the lamp and the electrical supply.

a. Ballast b. Filamentc. Fused. Rectifiers

42. Instrument for measuring the total quantity of electricity passing through a circuit due to a momentary current. The period of oscillation of the ____________ must be long compared with the time during which the current flows.

a. Wiggins Solenoid Meterb. Ammeter c. Barometerd. Ballistic Galvanometer

43. A filter designed to pass all frequencies within a band of frequencies.

a. Butterworth Filterb. Bandpass Filterc. Active Filterd. Bandstop Filter

44. A filter designed to eliminate all frequencies within a band of frequencies.

a. Butterworth Filterb. Bandpass Filterc. Active Filterd. Bandstop Filter

45. Commonly defined as the difference between the upper and lower frequencies of the half power points of the response relative to the reference frequency.

a. Cycleb. Frequency Differencec. Bandwidth d. Amplitude

46. The minimum load experienced by an electric utility system over a given period of time, which must be supplied at all times.

a. Base Loadb. Common Load c. Total Loadd. Continuous Load

47. Capacity of generating equipment operated to serve loads 24-hours per day.

a. Base Load Capacityb. Common Load Capacityc. Total Load Capacityd. Continuous Load Capacity

48. A number of primary or secondary cells arranged in series or parallel. A device for turning chemical energy into electrical energy.

a. Battery Backupb. Battery c. Battery Chargerd. Dynamo

49. A device or a system which provides the electrical power needed to keep the battery backup fully charged.


50. A battery or a set of batteries in a UPS system. Its purpose is to provide an alternate source of power if the main source is interrupted.


Answers:

1. A2. C3. D4. D5. C6. A7. D8. B9. B10. C11. A12. A13. B14. D15. C16. D17. D18. A19. A20. A21. B22. D23. A24. C25. D26. C27. D28. A29. A30. B31. C32. B33. D34. D35. A36. C37. A38. B39. D40. B41. A42. D43. B44. D45. C46. A47. A48. B49. C50. A

electrical engineering terms (guarina)

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