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Introduction to Electronic Emission, Tubes and Power Supplies


Quiz Questions

1.The _____________ is the electron-emitting element of a tube.
Cathode
Anode
2. Diode operation depends upon current flow through the tube.
True
False
3.Factors that limit vacuum tube operation are plate dissipation, maximum average current, maximum peak-plate and current and peak-inverse voltage.
True
False
4.A _________ is basically a diode with a control grid mounted between the plate and the cathode. The control grid gives it the ability to amplify signals.
Triode
Diode
5.Tube biasing is the process of placing a dc voltage, usually negative, on the grid.
True
False
6.The class of operation of an amplifier is not determined by the bias applied to a triode.
True
False
7._______________is the time required for electrons emitted by the cathode to reach the plate.
Conducting time
Transit time
8.______________were developed to compensate for the effects of inter electrode capacitance.
Tetrodes
Cathodes
Anodes
9.Pentodes do not suffer from the effects of secondary emission. This is because a negatively charged suppression grid placed between the screen grid and plate forces any electrons emitted back to the plate.
True
False
10. _________ tubes contain a small amount of gas that ionizes and reduces the internal resistance of the tubes.
Gas filled
Planar
11.UHF Tubes are special-purpose tubes designed to operate at ultrahigh frequencies between______________ with minimum effect from transit time limitations.
100 to 1000 MHz
200 to 2000 MHz
300 to 3000 MHz
12.Figure 3-1 represents ___________________.
Block diagram of a transformer
Block diagram of a power supply
Block diagram of a generating system
13.Therefore, current or voltage pulses with a value of .318 of the peak value have the same effect on the load as a steady voltage or current.
True
False
14._________________rectifier circuit uses two diodes (V1 and V2) and a center-tapped transformer (T1).
Half wave
Full wave
15.How many types of filter circuits exist?
Three
Four
Five
16.What is the most basic type of filter?
Resistor
Inductor
Capacitor

17.___________ are designed to smooth, or filter, the ripple voltage present on the pulsating dc output of the rectifier.
Rectifier circuits
Filter circuits
18.PI-type filters use both _________ and ____________filters connected in a pi-type configuration.
Resistive & inductive
Capacitive & resistive
Capacitive & inductive
19.Shunt regulators do not use a variable resistance placed in parallel with the load.
True
False
20.Ballast tube is normally used to control _________ surges.
Current
Voltageh