Q.1

How many types of flow are there in a semiconductor?

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

At room temperature an intrinsic semiconductor has

  • a few free electrons and holes
  • many holes
  • many free electrons
  • No holes
  • None of the above
Q.3

An unloaded zener regulator has a source voltage ofV, a series resistance ofW, and a zener voltage ofV, What is the Zener current?

  • 28.4 mA
  • 24.2 mA
  • 34.4 mA
  • 68.4 mA
  • None of the above
Q.4

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

  • thermocouple
  • solar cell
  • chemical cell
  • piezoelectric devices
  • None of the above
Q.5

Assumingefficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

  • 200 W
  • 1000 W
  • 20 W
  • 100 W
  • None of the above
Q.6

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

  • The total resistance is equal to the sum of the individual resistances in a parallel circuit.
  • The total resistance of a parallel circuit is always less than the value of the smallest resistance
  • The total resistance of a parallel circuit is equal to the total voltage
  • The total resistance in a parallel circuit is equal to the average value of the individual resistances
  • None of the above
Q.7

The current gain of a transistor is defined as the ratio of the collector current to the

  • base current
  • emitter current
  • supply current
  • collector current
  • None of the above
Q.8

When applying a square waveform to a capacitor, the circuit tends to:

  • peak the voltage and round off the current waveforms
  • peak the current and round off the voltage waveforms
  • round off both the voltage and current waveforms
  • peak both the voltage and current waveforms
  • None of the above
Q.9

When operating below 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.10

A step-down transformer has turns ration of 5:If the primary voltage isVrms, what is the secondary voltage?

  • 18 V
  • 12 V
  • 24 V
  • 30 V
  • None of the above
Q.11

The valence electron of a copper atom experiences what kind of attraction toward the nucleus?

  • Strong
  • Neutral
  • Weak
  • Impossible to say
  • None of the above
Q.12

The total capacitive reactance of a parallel capacitor circuit is:

  • equal to the sum 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 capacitance value of the smallest capacitor
  • None of the above
Q.13

Which one of the following statements is true for the voltage in a parallel RL 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 inductance
  • The total voltage lags the total current by less than 90
  • The total voltages is less than the sum of the voltages across the resistance and inductance
  • None of the above
Q.14

What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?

  • 692.2 Ohm
  • 844.5 Ohm
  • 3890 Ohm
  • 1234 Ohm
  • None of the above
Q.15

Which one of the following statements is true?

  • Capacitive reactance is at a minimum for dc source voltages
  • Capacitive reactance decreases as the operating frequency increases
  • There is no meaningful relationship between capacitive reactance and operating frequency
  • Capacitive reactance increases as the operating frequency increases
  • None of the above
Q.16

Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?

  • Flux density
  • Number of lines of force
  • Magnetomotive force
  • Reluctance
  • None of the above
Q.17

Current is

  • The flow of charged particles through a material
  • An imbalance of electrical charges
  • The force that causes electrons to flow
  • The number of free electrons in an atom
  • None of the above
Q.18

An ideal voltage source has

  • Zero internal resistance
  • Infinite internal resistance
  • A load dependent voltage
  • A load-dependent current
  • None of the above
Q.19

Which one of the following is most likely used for measuring the rate of electron flow?

  • Voltmeter
  • Ammeter
  • Wattmeter
  • Ohmmeter
  • None of the above
Q.20

How much power is being dissipated by aW resistance that hasV applied to it?

  • 0.24 W
  • 0.625 W
  • 80 W
  • 325 kW
  • None of the above
Q.21

Doubling the diameter of the coil in an inductor:

  • multiplies the value of inductance by two
  • reduces the value of inductance by one-half
  • reduces the value of inductance by one-fourth
  • multiplies the value of inductance by four
  • None of the above
Q.22

The direction of conventional current flow is:

  • from negative to positive
  • from positive to negative
  • from left to right
  • from neutral to positive
  • None of the above
Q.23

What is the total resistance of a parallel circuit that contains two resistors having values ofohm andohm?

  • 220 ohm
  • 150 ohm
  • 445 ohm
  • 690 ohm
  • None of the above
Q.24

Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit?

  • Number of lines of force
  • Flux density
  • Reluctance
  • Magnetomotive force
  • None of the above
Q.25

What causes the depletion layer?

  • Doping
  • Recombination
  • Barrier potential
  • Ions
  • None of the above
Q.26

Norton's theorem replaces a complicated circuit facing a load by an

  • Ideal voltage source and parallel resistor
  • Ideal current source and parallel resistor
  • Ideal voltage source and series resistor
  • Ideal current source and series resistor
  • None of the above
Q.27

Suppose a step-down transformer has a turns ration of 5:If the secondary current isrms, what is the primary-current?

  • 0.3 A
  • 0.2 A
  • 0.4 A
  • 0.6 A
  • None of the above
Q.28

Thevenin theorem replaces a complicated circuit facing a load by an

  • Ideal voltage source and parallel resistor
  • Ideal current source and parallel resistor
  • Ideal voltage source and series resistor
  • Ideal current source and series resistor
  • None of the above
Q.29

A low-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
  • reduces the level of all frequencies by a significant amount
  • None of the above
Q.30

Holes act like:

  • Atoms
  • Crystals
  • Negative charges
  • Positive charges
  • None of the above
0 h : 0 m : 1 s