Electronic Principles Questions with Answers - Set 09 - ObjectiveBooks
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# Practice Test: Question Set - 09

1. Which one of the following statements is true?
(A) Power dissipation of a pure inductor decreases with operating frequency
(B) Power dissipation of a pure inductor is at a maximum for dc source voltages
(C) Power dissipation of a pure inductor increases with operating frequency
(D) There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency

2. In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point
(A) Down
(B) Up
(C) Nowhere

3. Which one of the following is a statement of Kirchhoff’s voltage law?
(A) The total voltage in a parallel circuit is less than the value of the smallest voltage
(B) The algebraic sum of voltages in a loop is equal to zero
(C) The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
(D) The algebraic sum of voltages entering and leaving a point is equal to zero

4. Silicon atoms combine into an orderly pattern called a
(A) Crystal
(B) Covalent bond
(C) Semiconductor
(D) Valence orbit

5. At room temperature an intrinsic semiconductor has
(A) A few free electrons and holes
(B) Many holes
(C) Many free electrons
(D) No holes

6. The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
(A) 0.25
(B) 180
(C) 0.5
(D) 4

7. To get the Thevenin voltage, you have to
(C) Short the voltage source
(D) Open the voltage source

8. The direction of electron current flow is:
(A) From right to left
(B) From positive to negative
(C) From negative to positive
(D) From neutral to positive

9. An audio transformer has a turn ratio of 9, what is its impedance ratio?
(A) 81
(B) 85
(C) 6
(D) 9

10. Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?
(A) P = I2R
(B) P = IE
(C) P = E2/R
(D) I = P/E

11. A circuit has a Norton current of 10 mA and a Norton resistance of 10 kW. What is the Thevenin circuit?
(A) 1000 V and a series resistance of 10 k Ohm
(B) 100 V and a parallel resistance of 10 k Ohm
(C) 100 V and a series resistance of 10 k Ohm
(D) 1000 V and a parallel resistance of 10 kOhm

12. A device that converts mechanical pressure to electrical energy is called a:
(A) Piezoelectric device
(B) Solar cell
(C) Photodiode

13. A device that converts thermal energy to electrical energy is called a:
(A) Thermocouple
(B) Solar cell
(C) Chemical cell
(D) Piezoelectric devices

14. At room temperature a conductor has low many holes?
(A) Same number as free electrons
(B) Only those produced by thermal energy
(C) Less than the free electrons
(D) None of the above

15. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?
(A) 60 Ohm
(B) 99.3 Ohm
(C) 250 Ohm
(D) 70.7Ohm

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