electronic-principles computer-science question and answers -Page 18

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Home Aptitude

1. Which one of the following statements is true?
Options
A. Capacitive reactance is at a minimum for dc source voltages
B. Capacitive reactance decreases as the operating frequency increases
C. There is no meaningful relationship between capacitive reactance and operating frequency
D. Capacitive reactance increases as the operating frequency increases
E. None of the above

4. Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?
Options
A. Flux density
B. Number of lines of force
C. Magnetomotive force
D. Reluctance
E. None of the above

5. What is the primary difference between primary and secondary cell batteries?
Options
A. Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
B. Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
C. Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
D. Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
E. None of the above

6. The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
Options
A. One-half the primary current
B. Same as the primary current
C. Twice the primary current
D. No more than 10% less than the primary current
E. None of the above

7. Which one of the following statements is true for resistance in a parallel circuit?
Options
A. The total resistance is equal to the sum of the individual resistances in a parallel circuit.
B. The total resistance of a parallel circuit is always less than the value of the smallest resistance
C. The total resistance of a parallel circuit is equal to the total voltage
D. The total resistance in a parallel circuit is equal to the average value of the individual resistances
E. None of the above

8. Which one of the following statements most accurately describes the nature of inductive reactance?
Options
A. Inductive reactance is an opposition to current flow in dc circuits
B. Inductive reactance is an opposition to current flow in ac circuits
C. Inductive reactance is another term for counter emf
D. Inductive reactance is a force that tends to overcome the effects of counter emf
E. None of the above

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