Q.1

How many types of flow are there in a semiconductor?

  • 0
  • 1
  • 2
  • 3
  • None of the above
Q.2

Which one of the following phrases best describes residual magnetism?

  • Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
  • The force of attraction between the poles of a permanent and temporary magnetic field
  • The amount of magnetic flux that is not confined to the core material of an electromagnet
  • The circular magnetic field that surrounds a conductor carrying a current
  • None of the above
Q.3

The knee voltage of a diode is approximately equal to the

  • Applied voltage
  • Barrier potential
  • Breakdown voltage
  • Forward voltage
  • None of the above
Q.4

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

  • The total current is equal to the sum of the currents for the resistance and capacitance
  • 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 for the resistance and capacitance
  • The total current. is greater than the sum of the currents for the resistance and capacitance
  • None of the above
Q.5

A certain electromagnet hasturns of wire. How much current must flow through the coil in order to generate an mmf ofampere-turns?

  • 0.1 A
  • 1000 A
  • 10 A
  • 100 A
  • None of the above
Q.6

Holes are the minority carriers in which type of semiconductor?

  • Extrinsic
  • Intrinsic
  • n-type
  • p-type
  • None of the above
Q.7

A battery is a device composed of one or more:

  • chemical cells
  • voltage generators
  • solar cells
  • piezoeletric cells
  • None of the above
Q.8

Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

  • Ammeter
  • Voltmeter
  • Ohmmeter
  • Wattmeter
  • None of the above
Q.9

A transformer has a primary voltage ofV rms and a secondary voltage ofV rms. If the secondary current isrms, what is the primary current?

  • 7.8 mA
  • 208 mA
  • 200 mA
  • 300 mA
  • None of the above
Q.10

A zener regulator has an input voltage fromtoV and a load current from 5 tomA. If the zener voltage is 6.8 V, what value should the series resistor have?

  • 310 Ohm
  • 400 Ohm
  • 410 Ohm
  • 550 Ohm
  • None of the above
Q.11

Which one of the following statements is true for current flowing in a series circuit?

  • The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
  • The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
  • The same current flows through every part of a series circuit
  • The total current in a series circuit is equal to the total voltage multiplied by the total resistance
  • None of the above
Q.12

If a load resistance is 1 kW, a stiff current source has a resistance of

  • At least 10 Ohm
  • Less than 10 Ohm
  • More than 100 k Ohm
  • Less than 100 k Ohm
  • None of the above
Q.13

Doubling the number of turns of wire in an inductor:

  • reduces the value of inductance by one-half
  • multiplies the value of inductance by two
  • multiplies the value of inductance by four
  • reduces the value of inductance by one-fourth
  • None of the above
Q.14

Doubling the operating voltage of a purely capacitive circuit:

  • has no effect on the capacitive reactance
  • doubles the amount of capacitive reactance
  • multiplies the capacitive reactance by 7
  • cuts the capacitive reactance in half
  • None of the above
Q.15

What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

  • Electronical energy
  • Mechanical energy
  • Chemical energy
  • Solar energy
  • None of the above
Q.16

Household light bulbs have a given power rating, and they operate atV. Which one of the following equations most directly provides the current rating of these light bulbs?

  • P = I2R
  • P = IE
  • P = E2/R
  • I = P/E
  • None of the above
Q.17

The rms value of a sine waveform is:

  • the number of cycles completed in one second
  • the time required to complete one full cycle
  • equal to 0.707 times the peak amplitude
  • equal to 1.41 times the peak amplitude
  • None of the above
Q.18

The total inductance of a series inductor circuit is:

  • equal to the sum of the individual inductance values
  • equal to the sum of the individual inductive-reactance values
  • less than the value of the smallest inductor
  • equal to the source voltage divided by total current
  • None of the above
Q.19

A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?

  • 60 Ohm
  • 50 Ohm
  • 100 Ohm or more
  • 10 Ohm
  • None of the above
Q.20

A farad is defined as the amount of capacitance necessary for:

  • dissipating 1 W of power
  • causing an ac phase shift greater than 90 degree
  • storing 1 V for 1 second
  • changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
  • None of the above
Q.21

How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?

  • 0.02 A
  • 0.955 A
  • 10 A
  • 2.02 A
  • None of the above
Q.22

Which one of the following statements best applies to a parallel RLC circuit?

  • The voltage waveform for each component always has the same amplitude and phase as the applied voltage
  • The sum of the current is always less than the applied current
  • The current waveform for each component always has the same amplitude and phase as the applied current
  • All of the above
  • None of the above
Q.23

Which one of the following phrases most accurately describes a purely inductive circuit?

  • Resistances provide the only opposition to current flow
  • Inductive reactance provides the only opposition to current flow
  • Combinations of resistance and inductive reactance provide any opposition to current flow
  • The ac voltage lags the current by 90 degree
  • None of the above
Q.24

Which one of the following is a direct statement of Ohm's law?

  • The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
  • The total resistance of a parallel circuit is less than the value of the smallest resistance
  • The algebraic sum of voltages 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.25

When the graph of current versus voltage is a straight line, the device is referred to as

  • Active
  • Linear
  • Nonlinear
  • Bipolar
  • None of the above
Q.26

The number of free electrons and holes in intrinsic semiconductor increases when the temperature

  • Decreases
  • Increases
  • Stays the same
  • 0oC
  • None of the above
Q.27

What is the capacitive reactance of a 0.1 micro F capacitor that is operating atHz?

  • less than 1 Ohm
  • 1590 Ohm
  • 312 Ohm
  • 690 Ohm
  • None of the above
Q.28

The transistor has a collector current ofmA and a base current ofmA. What is the current gain of the transistor?

  • 250 μA
  • 350 μA
  • 0.25 μA
  • 300 μA
  • None of the above
Q.29

The equivalent of 1 micro A is:

  • 10000A
  • 1000 A
  • one-millionth of an ampere
  • one million amperes
  • None of the above
Q.30

A high-pass filter:

  • passes lower-frequency signals and reduces higher-frequency signals
  • passes higher-frequency signals and reduces lower-frequency signals
  • has no effect on ac signals
  • increases the level of all frequencies by a significant amount
  • None of the above
0 h : 0 m : 1 s