Q.1

What is a negative ion?

  • An atom that contains more electrons than neutrons
  • An atom that contains more protons than neutrons
  • An atom that contains more electrons than protons
  • An atom that contains more protons than electrons
  • None of the above
Q.2

Which one of the following principles best describes the basic operation of an electromagnet?

  • Current is induced in a conductor that is moving through a magnetic field
  • Like magnetic poles repel, while unlike poles attract
  • Current flowing through a conductor generates a magnetic field
  • Like magnetic poles attract, while unlike poles repel
  • None of the above
Q.3

Which one of the following statements is true for the voltage in a parallel RC circuit?

  • The voltage always has the same amplitude and phase for every part of the circuit
  • The total voltage is equal to the sum of the voltages across the resistance and capacitance
  • The total voltage leads the total current by less than 90 degree
  • The total voltage is less than the sum of the voltages across the resistance and capacitance
  • None of the above
Q.4

In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point

  • down
  • up
  • nowhere
  • off the load line
  • None of the above
Q.5

The transistor has a collector current of 2 mA. If the current gain iswhat is the base current?

  • 14.8 µA
  • 10.3 µA
  • 7.8 µA
  • 7.75 µA
  • None of the above
Q.6

The north pole of a magnet is the one:

  • that has its molecules arranged in a random pattern
  • that would be attracted to the earth's north magnetic pole
  • that would be repelled by the south pole of another magnet
  • that would be attracted to the earth's south magnetic pole
  • None of the above
Q.7

What is the impedance of a circuit composed of aohm resistor connected in parallel with an inductor that has a reactance ofW?

  • 77.7 ohm
  • 89.3 ohm
  • 88.8 ohm
  • 224 ohm
  • None of the above
Q.8

What is the smallest number of polarities required for current flow?

  • One - a negative terminal
  • Two - a negative terminal and a positive terminal
  • Three - negative, positive and neutral terminals
  • Four - two negative and two positive
  • None of the above
Q.9

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?

  • P = I2R
  • P = IE
  • P = E2/R
  • I = P/E
  • None of the above
Q.10

What is the barrier potential of a silicon diode at room temperature?

  • 0.7V
  • 0.3V
  • 1 V
  • 2 m V per degree Celsius
  • None of the above
Q.11

The direction of electron current flow is:

  • from right to left
  • from positive to negative
  • from negative to positive
  • from neutral to positive
  • None of the above
Q.12

The value of a capacitor can be made larger by:

  • increasing the area of the plates
  • decreasing the area of the plates
  • increasing the frequency of the applied voltage
  • increasing the voltage applied to the plates
  • None of the above
Q.13

Which one of the following statements most accurately applies to the frequency of a waveform?

  • The actual frequency of a sine waveform is 1.41 times the working frequency
  • Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
  • The higher the amplitude of a waveform, the higher its frequency
  • The longer the period of a waveform, the lower its frequency
  • None of the above
Q.14

Voltage is

  • The flow of charged particles through a material
  • The smallest electrically charged particle
  • Trie force that causes electrons to flow
  • The number of free electrons in an atom
  • None of the above
Q.15

Current and voltage are said to be in phase when:

  • their waveforms are both ac or both dc
  • they have the same amplitude and frequency
  • their waveforms cross through zero and reach positive and negative peaks at the same time
  • All of the above
  • None of the above
Q.16

A resistor has a rated value ofohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?

  • 90 Ohm - 101 ohm
  • 90 Ohm - 110 ohm
  • 98 Ohm - 100.1 ohm
  • 99 Ohm - 102 ohm
  • None of the above
Q.17

The nucleus of the copper atom contains how many protons?

  • 1
  • 4
  • 18
  • 29
  • None of the above
Q.18

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

  • 55 A
  • 55.86 A
  • 18.2 mA
  • 16.3 mA
  • None of the above
Q.19

The equivalent of 1 megohms is:

  • 1 k ohm
  • 100,000 ohm
  • one-millionth of an ohm
  • one million ohms
  • None of the above
Q.20

The Norton current is sometimes called the

  • Shorted-load current
  • Open-load current
  • Thevenin current
  • Thevenin voltage
  • None of the above
Q.21

A device that converts mechanical pressure to electrical energy is called a:

  • piezoelectric device
  • solar cell
  • photodiode
  • nicad cell
  • None of the above
Q.22

The value of a capacitor can be made larger by:

  • moving the plates further apart
  • moving the plates closer together
  • increasing the voltage applied to the plates
  • decreasing the voltage applied to the plates
  • None of the above
Q.23

The merging of a free electron and a hole is called

  • Covalent bonding
  • Lifetime
  • Recombination
  • Thermal energy
  • None of the above
Q.24

What is the turns ratio for the transformer specified in the above question?

  • 10.738
  • 0.707
  • 1.5
  • 0.575
  • None of the above
Q.25

Silicon atoms combine into an orderly pattern called a

  • Crystal
  • Covalent bond
  • Semiconductor
  • Valence orbit
  • None of the above
Q.26

When a parallel 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.27

Which one of the following statements is true for the impedance of a series RC circuit?

  • The impedance is greater than the sum of the resistance and capacitive reactance
  • The impedance is equal to the sum of the resistance and capacitive reactance
  • The impedance is greater than either the resistance or capacitive reactance but less than their sum
  • The impedance is less than the sum of the resistance and capacitive reactance
  • None of the above
Q.28

Which one of the following phrasers best describes flux density?

  • The concentration of lines of magnetic force
  • The rate of change of the number of lines of magnetic force
  • The opposition to a build-up of magnetic fields
  • The force that maintains lines of force
  • None of the above
Q.29

If the base supply voltage increases, the Q point moves

  • down
  • up
  • nowhere
  • off the load line
  • None of the above
Q.30

An audio transformer has a turn ratio ofWhat is its impedance ratio?

  • 81
  • 85
  • 6
  • 9
  • None of the above
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