B-004 — Circuit components

The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.

All 63 questions

• B-004-001-001 What term describes a circuit designed to increase the amplitude of a signal?
• B-004-001-002 If an amplifier becomes non-linear, the output signal would:
• B-004-001-003 To increase the level of very weak radio signals from an antenna, you would use:
• B-004-001-004 To increase the level of very weak signals from a microphone you would use:
• B-004-001-005 What range of frequencies does the speech amplifier of an amateur radio transceiver typically process?
• B-004-001-006 Apart from power and current, which signal property can amplifiers be specifically designed to increase?
• B-004-001-007 The increase in signal level by an amplifier is called:
• B-004-001-008 A device with gain has the property of:
• B-004-001-009 A device labelled "Gain = 10 dB" is likely to be an:
• B-004-001-010 What term describes the ratio of output power to DC input power of an amplifier?
• B-004-001-011 What is the result of excessive positive feedback in an amplifier stage?
• B-004-002-001 A diode is in series in the positive power lead to a transceiver. What is its purpose?
• B-004-002-002 One important application for diodes is recovering information from transmitted signals. This is referred to as:
• B-004-002-003 The primary purpose of a Zener diode is to:
• B-004-002-004 The action of changing alternating current to direct current is called:
• B-004-002-005 The electrodes of a semiconductor diode are known as:
• B-004-002-006 If alternating current is applied to the anode of a diode, what would you expect to see at the cathode?
• B-004-002-007 In a semiconductor diode, electrons flow from:
• B-004-002-008 What semiconductor device glows different colours, depending upon its chemical composition?
• B-004-002-009 Which property of a semiconductor diode permits its use for reverse-polarity protection?
• B-004-002-010 In order for a diode to conduct, it must be:
• B-004-003-001 Which of these components can amplify a small signal using low voltages?
• B-004-003-002 What term describes the most basic semiconductor component used to amplify?
• B-004-003-003 What are the three electrodes of a bipolar transistor?
• B-004-003-004 If a low-level signal is placed at the input to a transistor and a higher level of the signal is produced at the output, what is this effect called?
• B-004-003-005 What prevents the substitution of a PNP transistor with an NPN transistor?
• B-004-003-006 A semiconductor device is labelled as a "general purpose audio NPN device." What is it?
• B-004-003-007 What are the two basic types of bipolar transistors?
• B-004-003-008 Which of these operating conditions is most likely to cause a transistor to fail?
• B-004-003-009 Which electrode of the bipolar transistor controls the output current?
• B-004-003-010 When a bipolar transistor is used as a switch, which electrode controls its state?
• B-004-003-011 If a transistor is alternatively driven into saturation and cut-off, what does it behave like?
• B-004-004-001 When considering the material between source and drain, what are two basic types of field-effect transistors (FET)?
• B-004-004-002 Which semiconductor device has a gate, a drain and a source?
• B-004-004-003 In a field-effect transistor, which electrode controls the resistance of the device's channel?
• B-004-004-004 In a field-effect transistor, from which electrode do charge carriers enter the channel?
• B-004-004-005 In a field-effect transistor, from which electrode do charge carriers leave the channel?
• B-004-004-006 Why is a field-effect transistor considered a high impedance device?
• B-004-004-007 What is the control electrode in a field-effect transistor?
• B-004-004-008 In a field-effect transistor, what circuit parameter change causes the current to increase?
• B-004-004-009 Which electrode of a bipolar transistor corresponds to the source of a field-effect transistor?
• B-004-004-010 Which electrode of a bipolar transistor corresponds to the drain of a field-effect transistor?
• B-004-004-011 In a field-effect transistor, which two electrodes are connected to the ends of the channel?
• B-004-005-001 What is one reason a triode vacuum tube might be used instead of a transistor in a circuit?
• B-004-005-002 Which two elements of a triode carry the output current?
• B-004-005-003 A feature common to triode tubes and transistors is that both:
• B-004-005-004 Which electrode on a vacuum tube is operated with the highest positive voltage?
• B-004-005-005 Which semiconductor device has characteristics most similar to a triode vacuum tube?
• B-004-005-006 Which electrode of a vacuum triode is the control element?
• B-004-005-007 In a vacuum tube, which electrode emits electrons?
• B-004-005-008 What is inside the envelope of a triode tube?
• B-004-005-009 What term describes a vacuum tube with a cathode, a single grid and a plate?
• B-004-006-001 On resistors with four colour bands, which colour band specifies the tolerance?
• B-004-006-002 On a resistor with four colour bands, what do the first three colour bands indicate?
• B-004-006-003 On a resistor with four colour bands, what does the fourth colour band indicate?
• B-004-006-004 What are the possible values of a 100-ohm resistor with a 10% tolerance?
• B-004-006-005 On resistors with four colour bands, which colour band differentiates two resistors rated at 33 ohms and 39 ohms respectively?
• B-004-006-006 Out of the list of resistor tolerances below, which has the highest precision?
• B-004-006-007 Out of the list of resistor tolerances below, which has the lowest precision?
• B-004-006-008 How does the resistance of a resistor change with rising ambient temperature?
• B-004-006-009 Which resistor rating is specified as a given fraction per degree Celsius?
• B-004-006-010 On resistors with four colour bands, which colour band differentiates two resistors rated at 120 ohms and 1200 ohms respectively?
• B-004-006-011 Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads "red," "violet" and "yellow"?