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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