# 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

- (D) Off the load
line

**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**

- (A) Short the
load resistor

- (B) Open the
load resister

- (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 = I

^{2}R

- (B) P = IE

- (C) P = E

^{2}/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

- (D) Nicad cell

**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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