Electrical Studys

 

1➤ What is the typical voltage level of electricity used for long-distance transmission in high-voltage power lines?

1 pointA. 120 volts B. 240 voltsC. 480 voltsD. 345,000 volts

2➤ What is the primary purpose of step-up transformers in a power transmission system?

1 pointA. Increase current B.Decrease voltageC. Increase voltageD. Decrease power losses

3➤ Which transmission line configuration is most commonly used for long-distance power transmission?

1 pointA. Single-phase B. Two-phaseC. Three-phaseD. Four-phase

4➤ The phenomenon of electricity "leaking" from power lines into the surrounding air is known as:

1 pointA. Ohm's LawB. Corona dischargeC. Inductive couplingD. Voltage drop

5➤ What is the typical frequency of alternating current (AC) used for power transmission in most countries?

1 pointA. 50 Hz B. 60 HzC. 25 HzD. 10 Hz

6➤ Which of the following materials is commonly used for overhead transmission line conductors due to its high conductivity and strength?

1 pointA. CopperB. AluminumC. SteelD. Silver

7➤ In a transmission line, what is the primary purpose of insulators?

1 pointA. To increase current flowB. To reduce voltage C. To support the conductors and prevent electrical leakageD. To amplify power losses

8➤ When electrical power is transmitted over long distances, which of the following is a major concern?

1 pointA. Voltage dropB. Over current protectionC. ResistanceD. Frequency fluctuations

9➤ What is the standard unit of electrical resistance?

1 pointA. Volt B. AmpereC. OhmD. Watt

10➤ The ability of a material to conduct electric current is measured in terms of its:

1 pointA. Voltage B. FrequencyC. ConductanceD. Conductivity

11➤ Which transmission line parameter primarily affects the capacitance of a transmission line?

1 pointA. Conductor material B. Conductor diameterC. Conductor spacingD. Conductor temperature

12➤ What is the purpose of surge arresters in a power transmission system?

1 pointA. Reduce line losses B. Improve power factorC. Protect against lightning and voltage surgesD. Increase the voltage rating

13➤ In a three-phase power transmission system, how many conductors are typically used in each transmission tower?

1 pointA. 1B. 2C. 3D. 4

14➤ Which law states that the voltage drop across a transmission line is directly proportional to the current and the resistance of the line?

1 pointA. Ohm's Law B. Faraday's LawC. Kirchhoff's LawD. Maxwell's Law

15➤ What is the primary function of a circuit breaker in a power transmission system?

1 pointA. Convert AC to DC B. Regulate voltageC. Control current flow and protect against overcurrent conditionsD. Improve power quality

16➤ In a transmission line, which of the following factors contributes to power losses due to resistance?

1 pointA. High voltage B. Low currentC. High impedanceD. Low capacitance

17➤ Which of the following transmission line materials is known for its excellent strength-to-weight ratio and corrosion resistance?

1 pointA. Copper B. AluminumC. SteelD. Brass

18➤ The unit of electrical power is:

1 pointA. Ampere B. OhmC. VoltD. Watt

19➤ What is the typical operating voltage of a distribution transformer used to step down power for residential and commercial users?

1 pointA. 1 kV (kilovolt) B. 120 V (volts)C. 480 V (volts)D. 13.8 kV (kilovolt)

20➤ When power is transmitted over long distances, which of the following is a key advantage of using high-voltage transmission lines?

1 pointA. Reduced losses B. Increased capacitanceC. Improved power factorD. Greater current flow

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