ELECTRICAL 2 MODULE 1 EXAM QUESTIONS

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ELECTRICAL 2 MODULE 1 EXAM QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -45 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: Power factor is the ratio of true power to __ power

Answer:

Apparent Question 2: If the vector diagram of two AC waveforms is A right angle then the waves are __ degrees out of phase

Answer:

90

Question 3: What is ohms law

Answer:

I=E/R I- current E- volts R- resistance Question 4: In an inductive AC circuit when the applied voltage is at its maximum negative value the current is __

Answer:

Question 5: If the phase angle as of two sound waves are both at 00 then the waves are

Answer:

In phase

Question 6: Capacitive reactance __ when Frequency increases

Answer:

Decreases Question 7: The phase relationships that exist between the voltage and current in a inductive circuit can be remembered by __. Explain the meaning

Answer:

ELI the ICE man.ELI(voltage lead current in a inductive circuit) ICE(current leads voltage in a capacitive circuit)

Question 8: Three equal capacitors in series has __ of the applied voltage

Answer:

1/3

Question 9: The time for one cycle is 0.1 seconds the frequency is__

Answer:

10 Question 10: The __ of a circuit always opposes any change in the current of the circuit

Answer:

Inductance Question 11: A circuit has a peak voltage of 275 V the average voltage is. How do you get that?

Answer:

175.175v. 275x.637

Question 12: Capacitance is measured in __

Answer:

Farad or microfarad

Question 13: Opening the secondary of a CT (current transformer) underload will cause?

Answer:

Dangerously high voltages Question 14: Transformers in which the primary and secondary voltages are 180° out of phase are known as __ wound transformers

Answer:

Unlike Question 15: The turns ratio of a transformer with 200 turns into primary and 100 turns in the secondary is __

Answer:

2:1

Question 16: What is the total capacity of 30 microfarad capacitor in parallel with a 15 microfarad capacitor

Answer:

45

Question 17: What is true power measured in

Answer:

Watts

Question 18: What is the equation of power

Answer:

P=I^2xR

Question 19: Current an inductive circuit __ the voltage

Answer:

Lags behind Question 20: The hertz rating of a ac circuit is __ if the frequency is 20 cycles per 1/2 second

Answer:

40 hertz

Question 21: All DC rules and laws including Ohms law apply in AC circuits containing only __

Answer:

Resistance Question 22: The current an AC circuit With resistance only is __. the circuit has a resistance of 15 ohms and a voltage of 150 V

Answer:

10 amps

Question 23: To increase the capacitance of a capacitor __ the area of plates

Answer:

Increase

Question 24: A circuit has an rms voltage of 120vac, the peak voltage is?

Answer:

170v

Question 25: The average value of a AC sine wave is __ times the peak value

Answer:

0.637 Question 26: In power factor calculation is the product of the source voltage in the total current is the __

Answer:

Apparent power Question 27: What is the secondary voltage of a transformer that has a 200 turn primary with a 150VAC and a secondary of 100 turns?

Answer:

75vav

Question 28: And electric current always produces a __

Answer:

Magnetic field