Practice Test

In series RL circuit,

• Resistor voltage and total current are out of phase by 90°

• Inductive voltage leads the total current by 90°

• Inductive voltage lags the resistor voltage by 90°

• Inductive voltage and the resistor voltage are in phase

The energy in an electrob that is called the energy of position

• Electromotive force

• Kinematics

• Potential energy

• Kinematic energy

When the magnetic field of the inductor is completely collapsed, where is the energy of the tank circuit stored?

• In the circuit

• Capacitor

• Expanding the inductor

• Dissipated as heat

At the critical frequency, the output of a filter is reduced from its peak value by

• 0 dB

• -3 dB

• -20 dB

• -6 dB

At room temperature the current in an intrinsic semiconductor is due to

• Holes

• Ions

• Electrons

• Holes and Electrons

At room temperaturea semiconductor material is

• Perfect insulator

• Slightly conducting

• Conductor

• Any of the above

A zener diode is used in

• Voltage regulator circuit

• Amplifier circuits

• Both voltage regulator and amplofier circuit

• None of the above

As compared to an ordinary semiconductor diode, a Schottky diode

• Has lower cut in voltage

• Has higher cut in voltage

• Lower reverse saturation current

• Higher cut in voltage and lower reverse saturation current

Three 100W light bulbs are connected in parallel across the 120V power linr. If one bulb opens, how many bulbs can light?

• Zero

• One

• Two

• Three

What do you call the circuit below

• Half adder

• Full subtractor

• Full adder

• Half subtractor