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A complete circuit contains two parallel connected devices

29/11/2021 Client: muhammad11 Deadline: 2 Day

Exam: 986056RR - Electricity and Electronics

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Questions 1 to 25: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. An example of an atom that has no charge is one that has A. 3 protons, 2 electrons, and 1 neutron.

B. 1 proton, 2 electrons, and 3 neutrons.

C. 3 protons, 1 electron, and 3 neutrons.

D. 2 protons, 2 electrons, and 1 neutron.

2. In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the A. deflecting plate.

B. anode.

C. grid.

D. cathode.

3. To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your A. thumb in the direction of the magnetic flux.

B. forefinger in the direction of the lines of force.

C. thumb in the direction of the electromagnetic force.

D. forefinger in the direction of the motion.

4. The grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be A. accelerated toward the anode.

B. accelerated toward the cathode.

C. attracted to the cathode instead of the grid.

D. attracted to the anode instead of the grid.

5. Which of the following does not affect the electrical resistance of a body? A. Bodies directly surrounding the body

B. Material composing the body

C. Length of the body

D. Temperature of the body

6. If the resistance of an electric circuit is 12 ohms and the voltage in the circuit is 60 V, the current flowing through the circuit is A. 720 A.

B. 5 A.

C. 60 A.

D. 0.2 A.

The following question is based on the figure below.

7. If you want to stop the current flow through Device 3 in the circuit shown above, which one of the following single switches should you open? A. Switch S3

B. Switch S2

C. Switch S5

D. Switch S4

8. A body that offers little resistance to the movement of free electrons from one point to another is a/an A. capacitor.

B. conductor.

C. coulomb.

D. insulator.

9. If a bar of copper is brought near a magnet, the copper bar will be A. unaffected by the magnet.

B. attracted by the magnet.

C. made into an induced magnet.

D. repelled by the magnet.

10. When an electric current flows through a long conductor, each free electron moves A. from one end of the conductor to the other end.

B. with a speed of 300,000,000 m/s.

C. through a relatively short distance.

D. back and forth between the ends of the conductor.

11. A circuit contains two devices that are connected in parallel. If the resistance of one of these devices is 12 ohms and the resistance of the other device is 4 ohms, the total resistance of the two devices is A. 0.333 ohms.

B. 16 ohms.

C. 0.0625 ohms.

D. 3 ohms.

12. The relationship between a cathode and an anode involves A. electrons.

B. neutrons.

C. diodes.

D. protons.

13. The ability to regulate the amount of charge flowing in a circuit is A. direct current.

B. alternating current.

C. voltage.

D. resistance.

14. A transmission system at a radio station uses a/an _______ to convert a direct current into a high frequency alternating current. A. modulator

B. demodulator

C. oscillator

D. transmitting antenna

15. The magnitude of the voltage induced in a conductor moving through a stationary magnetic field depends on the _______ and the _______ of the conductor. A. color, capacitance

B. resistance, current

C. distance, circumference

D. length, speed

16. What bias conditions must be present for the normal operation of a transistor amplifier? A. Both junctions must be reverse biased.

B. The emitter-base junction must be reverse biased, and the collector-base junction must be forward biased.

C. The emitter-base junction must be forward biased, and the collector-base junction must be reverse biased.

D. Both junctions must be forward biased.

17. The unit for measuring electric power is the A. volt.

B. ampere.

C. ohm.

D. watt.

18. If an electrically uncharged body is contacted by an electrically charged body, the uncharged body will A. remain a neutrally charged body.

B. neutralize the charged body.

C. develop the same charge as the charged body.

D. develop the opposite charge as the charged body.

19. The part of the atom that accounts for electricity is the A. nucleus.

B. electron.

C. proton.

D. neutron.

20. When all parts of a circuit are composed of conducting materials, the circuit is said to be A. open.

B. parallel.

C. closed.

D. shorted.

21. A battery consists of five dry cells connected in series. If the voltage developed by each cell is 1.5 V, the total voltage developed by the battery is A. 1.5 V.

B. 5.0 V.

C. 7.5 V.

D. 0.3 V.

22. When an electron is displaced in a semiconductor, the hole that's left behind is A. incapable of carrying a charge.

B. considered an impurity in the crystal.

C. attracted to the anode of the voltage source.

D. attracted to the negative terminal of the voltage source.

23. A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns

End of exam

in the primary is 345, how many turns are in the secondary? A. 1,653

B. 72

C. 690

D. 8

24. Including a full-wave rectifier in an AC circuit will yield a(n) _______ current. A. intermittent direct

B. continuous direct

C. intermittent alternating

D. continuous alternating

25. A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device? A. 13.32 A

B. 10 A

C. 8 A

D. 3.33 A

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