Determining capacitive reactance

Reference no: EM131017407

1. Which of the following is a correct statement concerning omega (ω)?

A. to must be converted to degrees
B. to is no longer being used.
C. to must be converted to radians.
D. to is equal to 2Πf

2. Which of the following is the same as 6 nanofarads?
A. 6 x 10^-12 farads
B. 6 x 10^-9 farads
C. 6 x 10⁶ farads
D. 6 x 10^-6farads

3. Which of the following is not a passive component?
A. Capacitor
B. Transistor
C. Resistor
D. Inductor

4. How many radians are equal to 57.3 degrees?
A. 1.0
B. Π
C. 2Π
D. Π2

5. In the time-constant curve of a resistor and large inductor, the initial part of the curve that represents the start-up of current is blank. That blank space is due to
A. inductive reactance.
B. switching delay.
C. slow switching speed.
D. kickback voltage.

6. Canactive reactance is measured in

A. farads.
B. henries.
C. ohms.
D. microfarads.

7. On a graph of a sine wave, time
A. stands still if the graph is plotted on the radian axis.
B. stands still if the graph is plotted on a degree axis.
C. gets later as you move to the right.
D. gets later as you move to the left.

8. Which of the following is a correct example of scientific notation?
A. 6000 x 10² Hertz
B. 600,000 Hertz
C. 600 x 10³ Hertz
D. 6 x 10⁵ Hertz

9. Which of the following is a component that opposes any change in current through it?
A. Air-dielectric capacitor
B. Coil
C. Resistor
D. Mylar-dielectric capacitor

10. Which of the following is the correct formula for determining capacitive reactance?

A. X_c = 0.159/f_c
B. X_c = 27cf/t
C. X_c= 0.159 xR xC
D. X_c = 1/ωC

11. Any periodic wave, regardless of its wave shape, can be constructed with a combination of
A. triangular waves.
B. angles.
C. square waves.
D. sine waves.

12. Which of the following is a component that opposes any change in voltage across its terminals?
A. Capacitor
B. Transistor
C. Inductor
D. Resistor

13. Which of the following is correct?
A. Π radians = 360°
B. Π radians = 90°
C. Π radians = 270°
D. Π radians = 180°

14. According to Faraday's Law, every time there's motion between a conductor and magnetic field, there's
A. a current generated.
B. heat generated.
C. a voltage generated.
D. friction.

15. When an AC sine wave current flows through an inductor, the current
A. is a square wave.
B. lags the voltage.
C. leads the voltage.
D. is in phase with the voltage.

16. Components that do not generate a voltage are called_____components
A. passive
B. intrinsic
C. bilateral
D. active.

17. Which of the following is correct for calculating inductive reactances?

A. X_L= 1/2 ΠfL
B. X_L - 2ΠfL

C. X_L = Ldi/dt
D. X_L = time constant x L

18. How long does it take a capacitor to charge through a resistor to 63% of the applied DC voltage?

A. 0.63 of one time constant
B. 0.63 seconds
C. One time constant
D. 50% of one time constant

19. How many radians are there in 90 degrees?
A. Π radians
B. 2Π radians
C. Π/2 radians

D. Π/4 radians

20. Which of the following is the meaning of di/dt?

A. Rate of change of current
B. Magnitude of current
C. Change in current
D. Current at some instant of time

Reference no: EM131017407

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