# Practice Test: Question Set - 07

**1. Which one of the following statements is true?**

- (A) The
secondary voltage for a step-down power transformer is greater than the primary
voltage

- (B) The
secondary current for a step-down power transformer is greater than the primary
voltage

- (C) Parallel RLC
circuit operated below its resonant frequency

- (D) Purely
resistive circuit

**2. The nucleus of the copper atom contains how many protons?**

- (A) 1

- (B) 4

- (C) 19

- (D) 29

**3. Who invented the first junction transistor?**

- (A) Smith

- (B) Gomes

- (C) Fisher

- (D) Shockley

**4. Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?**

- (A) 100 V

- (B) 120 V

- (C) 170 V

- (D) 180 V

**5. The equivalent of 1 megohms is:**

- (A) 1 k ohm

- (B) 100,000 ohm

- (C) One-millionth
of an ohm

- (D) One million
ohms

**6. What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?**

- (A) 220 ohm

- (B) 150 ohm

- (C) 445 ohm

- (D) 690 ohm

**7. Which one of the following is a statement of Kirchhoffs current law?**

- (A) The
current through a resistance is proportional to the value of resistance and the
IR drop across it

- (B) The
total current in a parallel circuit is less than the value of the smallest
current

- (C) The
algebraic sum of currents in a loop is equal to zero

- (D) The
algebraic sum of currents entering and leaving a point is equal to zero

**8.A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?**

- (A) 2 k Ohm

- (B) 10 k Ohm

- (C) 20 k Ohm

- (D) 1 k Ohm

**9. One henry of inductance is defined as:**

- (A) The amount
of counter emf required to reduce a current to 1 A

- (B) The
amount of inductance required for generating 1 V of counter emf when the
current changes at the rate of 1 A per second

- (C) The amount
of inductance required to change the frequency of a current by 1 Hz

- (D) The
number of turns of wire in an inductor multiplied by the amount of current
flowing through it

**10. Doubling the operating frequency of a capacitive circuit:**

- (A) Doubles the
amount of a capacitive reactance

- (B) Has no
effect on the capacitive reactance

- (C) Cuts the
capacitive reactance in half

- (D) Multiplies
the capacitive reactance by 6.28

**11. As the temperature increases, the current gain**

- (A) Increases

- (B) Decreases

- (C) Constant

- (D) Can be any
of the above

**12. The value of a capacitor can be made larger by:**

- (A) Moving the
plates further apart

- (B) Moving the
plates closer together

- (C) Increasing
the voltage applied to the plates

- (D) Decreasing
the voltage applied to the plates

**13. What kind of device is a diode?**

- (A) Bilateral

- (B) Linear

- (C) Nonlinear

- (D) Unipolar

**14. Current can flow through a normally open push button switch as long as:**

- (A) You are
pressing the button

- (B) You are not
pressing the button

- (C) Its contact
remain open

- (D) Its contact
remain open

**15. A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?**

- (A) 55 A

- (B) 55.86 A

- (C) 18.2 mA

- (D) 16.3 mA

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