Q.1

When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:

  • parallel RL circuit
  • parallel RC circuit
  • parallel RLC circuit operated above its resonant frequency
  • purely resistive circuit
  • None of the above
Q.2

The total capacitance of a series capacitor circuit is:

  • equal to the sun of the individual capacitive-reactance values
  • equal to the sum of the individual capacitance values
  • equal to the source voltage divided by total current
  • less than the value of the smallest capacitor
  • None of the above
Q.3

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

  • The total voltage is equal to the sum of the individual voltages in a series circuit
  • The total voltage in a series circuit is equal to the average value of the individual voltages
  • The total voltage of a series circuit is equal to the total current divided by the total resistance
  • The total voltage in a series circuit is always less than the value of the smallest voltage
  • None of the above
Q.4

A device that converts chemical energy to electrical energy is called a:

  • solar cell
  • thermocouple
  • chemical cell
  • electric device
  • None of the above
Q.5

What is the impedance of a circuit composed of aohm resistor connected in parallel with a capacitor that has a reactance ofohm?

  • 60 Ohm
  • 99.3 Ohm
  • 250 Ohm
  • 70.7Ohm
  • None of the above
Q.6

Two diodes are in series. The first diode has a voltage of 0.V and the second has a voltage of 0.8 V. If the current through the first diode ismA, what is the current through the second diode

  • 11 mA
  • 12 mA
  • 10 mA
  • 14 mA
  • None of the above
Q.7

Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?

  • E = PR
  • E = I2R
  • I = E/R
  • I = ER
  • None of the above
Q.8

At room temperature a conductor has low many holes?

  • Same number as free electrons
  • many
  • Only those produced by thermal energy
  • less than the free electrons
  • None of the above
Q.9

The primary impedance of a transformer isohm and the secondary impedance isohm. What is the impedance ratio?

  • 0.25
  • 180
  • 0.5
  • 4
  • None of the above
Q.10

One henry of inductance is defined as:

  • the amount of counter emf required to reduce a current to 1 A
  • the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
  • the amount of inductance required to change the frequency of a current by 1 Hz
  • the number of turns of wire in an inductor multiplied by the amount of current flowing through it
  • None of the above
Q.11

The total impedance of a series RLC circuit:

  • is minimum at the resonant frequency
  • always increases as the applied frequency increases
  • always decreases as the applied frequency increases
  • is maximum at the resonant frequency
  • None of the above
Q.12

The rotating coil of wire in an electric motor is called the:

  • armature
  • brush
  • commutator
  • loop
  • None of the above
Q.13

For normal operation of the transistor, the collector diode has to be

  • Forward-biased
  • Reverse-biased
  • Nonconducting
  • Operating in the breakdown region
  • None of the above
Q.14

If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

  • down
  • up
  • nowhere
  • off the load line
  • None of the above
Q.15

Which is the most widely used semiconductor?

  • Copper
  • Silicon
  • Germanium
  • All of the above
  • None of the above
Q.16

Positive ions are atoms that have

  • Gained a proton
  • Lost a proton
  • Gained an electron
  • Lost an electron
  • None of the above
Q.17

Which one of the following statements is true?

  • The secondary voltage for a step-down power transformer is greater than the primary voltage
  • The secondary current for a step-down power transformer is greater than the primary voltage
  • Parallel RLC circuit operated below its resonant frequency
  • purely resistive circuit
  • None of the above
Q.18

Doubling the operating frequency of an inductive circuit:

  • has no effect on the inductive reactance
  • doubles the amount of inductive reactance
  • multiplies the inductive reactance by 6.28
  • cuts the inductive reactance in half
  • None of the above
Q.19

Assumingefficiency, what is the power being applied to the primary winding of the transformer described in the above question?

  • 200 W
  • 1000 W
  • 20 W
  • 100 W
  • None of the above
Q.20

A basic capacitor is composed of:

  • two conductors separated by a dielectric
  • two dielectrics separated by a conductor
  • two coils separated by a dielectric
  • two coils separated by a conductor
  • None of the above
Q.21

Suppose the peak value of a sinusoidal voltage isV. What is the rms value?

  • 37.4 V
  • 35.4 V
  • 38.74 V
  • 30.4 V
  • None of the above
Q.22

Current can flow through a normally open push button switch as long as:

  • you are pressing the button
  • you are not pressing the button
  • its contact remain open
  • its contact remain open
  • None of the above
Q.23

The graph of current gain versus collector current indicates that the current gain

  • varies enormously
  • is contant
  • varies slightly
  • equals the collector current divided by the base current
  • None of the above
Q.24

Suppose a current source has an Ideal current ofmA and an internal resistance ofMW. For what values of load resistance will the current source appear stiff?

  • 20 k Ohm or more
  • 200 k Ohm or less
  • 200 k Ohm or more
  • 20 km or less
  • None of the above
Q.25

A current source has an internal resistance ofkW. What is the largest load resistance if the current source must appear stiff?

  • 2 k Ohm
  • 10 k Ohm
  • 20 k Ohm
  • 1 k Ohm
  • None of the above
Q.26

The Thevenin resistance is equal in value to the

  • Load resistance
  • Half the load resistance
  • Internal resistance of a Morton circuit
  • Open-load resistance
  • None of the above
Q.27

Suppose a voltage source has an ideal voltage ofand an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

  • 5 Ohm
  • 50 Ohm or more
  • 100 Ohm
  • 6 Ohm
  • None of the above
Q.28

The basic unit of measurement for current is the:

  • volt
  • watt
  • ampere
  • ohm
  • None of the above
Q.29

If a load resistance is 1 kW, a stiff voltage 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.30

Which one of the following statements is true for the voltages in a series RL circuit?

  • The total voltages is equal to the sum of the voltages across the resistance and inductance
  • The voltage always has the same amplitude and phase for every part of the circuit
  • The total voltage is less than the sum of the voltages across the resistance and inductance
  • The total voltage lags the total current by less than 90
  • None of the above
0 h : 0 m : 1 s