Q.1

The peak value of a sine waveform is:

  • the amplitude at 70.7% of the maximum value
  • the amplitude at 90% of the maximum value
  • the amplitude at 1.41 times the maximum value
  • the maximum positive or negative value
  • None of the above
Q.2

What kind of battery is most likely included in a cordless electric knife?

  • Zinc-carbon battery
  • Mercury-cell battery
  • Nicad battery
  • Lead-acid battery
  • None of the above
Q.3

A real voltage source has

  • Zero internal resistance
  • Infinite internal resistance
  • A small internal resistance
  • A large internal resistance
  • None of the above
Q.4

Suppose a voltage source has an ideal voltage ofand a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?

  • 20 Ohm
  • 30 Ohm
  • 10 Ohm
  • 100 Ohm
  • None of the above
Q.5

Doubling the operating frequency of a purely inductive circuit:

  • doubles the amount of current through the inductors
  • has no effect on the current through the inductors
  • cuts the current through the inductors one-half
  • increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
  • None of the above
Q.6

The equivalent of 1 kV is:

  • 1.00 V
  • 1000 V
  • 100 mV
  • 1000 mV
  • None of the above
Q.7

Who invented the first junction transistor?

  • Smith
  • Gomes
  • Fisher
  • Shockley
  • None of the above
Q.8

Which one of the following statements most accurately reflects the nature of ac power?

  • The current in an ac circuit flows in one direction, but changes value periodically
  • The current in an ac circuit flows in one direction at a steady level
  • The current in an ac circuit changes direction periodically
  • The current in an ac circuit flows in two directions at the same time
  • None of the above
Q.9

Which one of the following statements regarding ac circuits is correct?

  • Current and voltage are in phase through an inductor
  • Current leads the voltage through an inductor
  • Current lags the voltage through an inductor
  • All of the above
  • None of the above
Q.10

What kind of device is a diode?

  • Bilateral
  • Linear
  • Nonlinear
  • Unipolar
  • None of the above
Q.11

What is one important thing transistors do?

  • Emit light
  • Amplify weak signals
  • Regulate voltage
  • Rectify line voltage
  • None of the above
Q.12

How may valence electrons does a silicon atom have?

  • 0
  • 1
  • 2
  • 4
  • None of the above
Q.13

The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:

  • One-half the primary current
  • Same as the primary current
  • Twice the primary current
  • No more than 10% less than the primary current
  • None of the above
Q.14

The period of a waveform is:

  • the time required to complete one full cycle
  • the number of cycles completed in one second
  • the time required for the voltage to rise from 10% to 90% of the peak amplitude
  • equal to 0.707 times the peak amplitude
  • None of the above
Q.15

When a series RLC circuit is operating at its resonant frequency:

  • capacitive reactance is greater than the inductive reactance
  • inductive reactance is greater than the capacitive reactance
  • inductive reactance is equal to the capacitive reactance
  • the difference between inductive and capacitive reactance is equal to the resistance
  • None of the above
Q.16

A step-up transformer has a turns ratio of 1:If the line voltage isV rms, what is the peak secondary voltage?

  • 700 V
  • 707 V
  • 651 V
  • 208 V
  • None of the above
Q.17

Doubling the operating frequency of a capacitive circuit:

  • doubles the amount of a capacitive reactance
  • has no effect on the capacitive reactance
  • cuts the capacitive reactance in half
  • multiplies the capacitive reactance by 6.28
  • None of the above
Q.18

Which one of the following statements applies to common, non-rechargeable flashlight batteries?

  • Common flashlight batteries are secondary wet-cell batteries
  • Common flashlight batteries are primary wet-cell batteries
  • Common flashlight batteries are primary dry-cell batteries
  • Common flashlight batteries are secondary dry-cell batteries
  • None of the above
Q.19

At room temperature an intrinsic silicon crystal acts approximately like

  • a battery
  • a conductor
  • an insulator
  • a piece of copper wire
  • None of the above
Q.20

Reducing the amount of current through an inductor:

  • reduces the value of inductance by one-half
  • multiplies the value of inductance by four
  • multiplies the value of inductance by two
  • has no effect on the inductance
  • None of the above
0 h : 0 m : 1 s