Computer Principles Free Online Practice - Set 05 - ObjectiveBooks
Hello everybody! You can translate the content of this page by selecting a language in the select box.

# Practice Test: Question Set - 05

1. The core of an electromagnet is said to be in saturation when:
(A) The core is permitted to move freely within the coil
(B) An increase in current through the coil causes no further increase in the mmf
(C) Frequent changes in the direction of current through the coil causes heating effects in the core material
(D) Changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

2. Which one of the following phrases most accurately describes the nature of a pulsating dc voltage?
(A) The voltage remains at one polarity and at a steady level
(B) The voltage remains at one polarity but changes value periodically
(C) The voltage causes current to flow in two directions at the same time
(D) The voltage reverses polarity periodically

3. Which one of the following statements best applies to a series RLC circuit?
(A) The voltage waveform for each component always has the same amplitude and phase as the applied voltage
(B) The current waveform for each component always has the same amplitude and phase as the applied current
(C) The sum of the current is always less than the applied current
(D) None of the above

4. If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point
(A) Down
(B) Up
(C) Nowhere

5. The total impedance of a series RLC circuit:
(A) Is minimum at the resonant frequency
(B) Always increases as the applied frequency increases
(C) Always decreases as the applied frequency increases
(D) Is maximum at the resonant frequency

6. A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?
(A) 12 V
(B) 18 V
(C) 24 V
(D) 30 V

7. The total capacitance of a series capacitor circuit is:
(A) Equal to the sun of the individual capacitive-reactance values
(B) Equal to the sum of the individual capacitance values
(C) Equal to the source voltage divided by total current
(D) Less than the value of the smallest capacitor

8. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
(A) Clockwise
(B) Counterclockwise

9. What causes the depletion layer?
(A) Doping
(B) Recombination
(C) Barrier potential
(D) Ions

10. A typical light switch in your home is a:
(A) Knife switch
(B) Toggle switch
(C) Rotary switch
(D) Momentary push button switch

11. For normal operation of the transistor, the collector diode has to be
(A) Forward-biased
(B) Reverse-biased
(C) Non-conducting
(D) Operating in the breakdown region

12. When applying a square waveform to a capacitor, the circuit tends to:
(A) Peak the voltage and round off the current waveforms
(B) Peak the current and round off the voltage waveforms
(C) Round off both the voltage and current waveforms
(D) Peak both the voltage and current waveforms

13. A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
(A) 15 V
(B) 16 V
(C) 7.5 V
(D) 8 V

14. The graph of current gain versus collector current indicates that the current gain
(A) Varies enormously
(B) Is constant
(C) Varies slightly
(D) Equals the collector current divided by the base current

15. The total inductive reactance of a parallel inductor circuit is:
(A) Equal to the sum of the individual inductive-reactance values
(B) Equal to the sum of the individual inductance values
(C) Equal to the source voltage divided by total current
(D) Less than the inductance value of the smallest inductor

Show and hide multiple DIV using JavaScript View All Answers

Next Tests:
Blogger Comment