Q.1

The basic unit of measurement for resistance is the:

  • volt
  • ampere
  • ohm
  • watt
  • None of the above
Q.2

Absolute Zero temperature equals

  • 0o C
  • -273o C
  • -276o C
  • 25o C
  • None of the above
Q.3

In a step-down transformer, which is larger?

  • Primary voltage
  • Secondary voltage
  • Neither
  • Impossible to say
  • None of the above
Q.4

What is a free electron?

  • An electron that has been freed from its parent atom
  • An electron that costs nothing
  • An electron that has no electrical charge
  • An electron that has twice the amount of charge of a normal electron
  • None of the above
Q.5

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

  • Current and voltages are in phase through a resistor
  • Current leads the voltage through a resistor
  • Current lags the voltage through a resistor
  • All of the above
  • None of the above
Q.6

What is the power dissipation of a resistance that hasV dropped across it and 0.A flowing through it?

  • 3 W
  • 6 W
  • 64 W
  • 122 W
  • None of the above
Q.7

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

  • The current always has the same amplitude and phase for every part of the circuit
  • The total current is equal to the sum of the currents for the resistance and capacitance
  • The total current is greater than the sum of the currents for the resistance and capacitance
  • The total current is less than the sum of the currents for the resistance and capacitance
  • None of the above
Q.8

What is the turns ratio of a power transformer that showsV at its secondary winding when you applyV to its primary winding?

  • 1/4
  • 1/3
  • 2
  • 3
  • None of the above
Q.9

The transistor has a current gain ofIf the base current is 0.1 mA, what is the collector current?

  • 1750 mA
  • 17.5 mA
  • 175 mA
  • 1.75 mA
  • None of the above
Q.10

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

  • The current through a resistance is proportional to the value of resistance and the IR drop across it
  • The total current in a parallel circuit is less than the value of the smallest current
  • The algebraic sum of currents in a loop is equal to zero
  • The algebraic sum of currents entering and leaving a point is equal to zero
  • None of the above
Q.11

How many protons does the nucleus of a silicon atom contain?

  • 4
  • 29
  • 14
  • 48
  • None of the above
Q.12

A circuit has a Norton current ofmA and a Norton resistance ofkW. What is the Thevenin circuit?

  • 1000 V and a series resistance of 10 k Ohm
  • 100 V and a parallel resistance of 10 k Ohm
  • 100 V and a series resistance of 10 k Ohm
  • 1000 V and a parallel resistance of 10 kOhm
  • None of the above
Q.13

To get the Thevenin voltage, you have to

  • Short the load resistor
  • Open the load resister
  • Short the voltage source
  • Open the voltage source
  • None of the above
Q.14

Which one of the following devices is most often used for measuring electrical potential difference?

  • Voltmeter
  • Ohmmeter
  • Ammeter
  • Wattmeter
  • None of the above
Q.15

What is the difference between a conductor and an insulator?

  • A conductor allows current to flow much easier than an insulator does
  • An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
  • An insulator allows current to flow much easier than a conductor does
  • The difference between conductors and insulators depends on how they are used
  • None of the above
Q.16

Doubling the operating frequency of a purely capacitive circuit:

  • has no effect on the total circuit current
  • doubles the amount of total current
  • cuts the total current by one-half
  • thrice the amount of total current
  • None of the above
Q.17

Which one of the following statements is true for the currents in a parallel RL circuit?

  • The total current is equal to the sum of the currents through the resistance and inductance
  • The current always has the same amplitude and phase for every part of the circuit
  • The total current is less than the sum of the currents through the resistance and inductance
  • The total current leads the total voltage by less than 90
  • None of the above
Q.18

If the current gain isand the collector current ismA, the base current is

  • 2 mA
  • 0.5 mA
  • 2 A
  • 200 A
  • None of the above
Q.19

When the Q point moves along the load line, the voltage increases when the current

  • Decreases
  • Stays the same
  • Increases
  • Can be any of above
  • None of the above
Q.20

Most AC power is obtained from:

  • generators
  • batteries
  • oscillators
  • lightning
  • None of the above
Q.21

Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?

  • Clockwise
  • Counterclockwise
  • Out of this page
  • Into this page
  • None of the above
Q.22

Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

  • The voltage remains at one polarity and at a steady level
  • The voltage remains at one polarity but changes value periodically
  • The voltage causes current to flow in two directions at the same time
  • The voltage reverses polarity periodically
  • None of the above
Q.23

A typical light switch in your home is a:

  • knife switch
  • toggle switch
  • rotary switch
  • momentary push button switch
  • None of the above
Q.24

The core of an electromagnet is said to be in saturation when:

  • the core is permitted to move freely within the coil
  • an increase in current through the coil causes no further increase in the mmf
  • frequent changes in the direction of current through the coil causes heating effects in the core material
  • changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
  • None of the above
Q.25

What is the phase shift between total current and voltage, ifohm resistor connected in parallel with an inductor that has a reactance of 200W?

  • 0 degree
  • 26.6 degree
  • 90 degree
  • 180 degree
  • None of the above
Q.26

At cut off, the Q point is at

  • upper end of the load line
  • middle of the load line
  • lower end of the load line
  • infinity
  • None of the above
Q.27

To get the Norton current, you have to

  • Short the load resistor
  • Open the load resistor
  • Short the voltage source
  • Open the voltage source
  • None of the above
Q.28

Which one of the following statements most accurately describes the nature of inductive reactance?

  • Inductive reactance is an opposition to current flow in dc circuits
  • Inductive reactance is an opposition to current flow in ac circuits
  • Inductive reactance is another term for counter emf
  • Inductive reactance is a force that tends to overcome the effects of counter emf
  • None of the above
Q.29

Which one of the following kinds of materials has the highest permeability?

  • A diamagnetic material
  • A ferromagnetic material
  • A paramagnetic material
  • All of the above
  • None of the above
Q.30

Inductive reactance is measured in units of:

  • volts per second
  • amperes per second
  • Ohm
  • henrys
  • None of the above
0 h : 0 m : 1 s