A-001 — Advanced theory

Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.

All 54 questions

• A-001-001-001 What is the meaning of the term "time constant" in an RL circuit ?
• A-001-001-002 What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?
• A-001-001-003 What is the term for the time required for the current in an RL circuit to build up to 63.2% of the maximum value?
• A-001-001-004 What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial value of stored charge?
• A-001-001-005 What is meant by "back EMF"?
• A-001-001-006 After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?
• A-001-001-007 After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage?
• A-001-001-008 What is the time constant of a circuit having a 100 microfarad capacitor in series with a 470 kilohm resistor?
• A-001-001-009 What is the time constant of a circuit having a 470 microfarad capacitor in series with a 470 kilohm resistor?
• A-001-001-010 What is the time constant of a circuit having a 220 microfarad capacitor in series with a 470 kilohm resistor?
• A-001-002-001 What is the result of skin effect?
• A-001-002-002 What effect causes most of an RF current to flow along the surface of a conductor?
• A-001-002-003 Where does almost all RF current flow in a conductor?
• A-001-002-004 Why does most of an RF current flow within a very thin layer under the conductor's surface?
• A-001-002-005 Why is the resistance of a conductor different for RF currents than for direct currents?
• A-001-002-006 What unit measures the ability of a capacitor to store electrical charge?
• A-001-002-007 A wire has a current passing through it. Surrounding this wire there is:
• A-001-002-008 In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?
• A-001-002-009 What is the term for energy that is stored in an electromagnetic or electrostatic field?
• A-001-002-010 Between the charged plates of a capacitor there is:
• A-001-002-011 Energy is stored within an inductor that is carrying a current. The amount of energy depends on this current, but it also depends on a property of the inductor. This property has the following unit:
• A-001-003-001 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 50 microhenrys and C is 40 picofarads?
• A-001-003-002 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 40 microhenrys and C is 200 picofarads?
• A-001-003-003 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 50 microhenrys and C is 10 picofarads?
• A-001-003-004 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads?
• A-001-003-005 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 3 microhenrys and C is 40 picofarads?
• A-001-003-006 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 4 microhenrys and C is 20 picofarads?
• A-001-003-007 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 8 microhenrys and C is 7 picofarads?
• A-001-003-008 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 3 microhenrys and C is 15 picofarads?
• A-001-003-009 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 4 microhenrys and C is 8 picofarads?
• A-001-003-010 What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 1 microhenry and C is 9 picofarads?
• A-001-003-011 What is the value of capacitance (C) in a series R-L-C circuit, if the circuit resonant frequency is 14.25 MHz and L is 2.84 microhenrys?
• A-001-004-001 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 1 microhenry and C is 10 picofarads?
• A-001-004-002 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 15 picofarads?
• A-001-004-003 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 5 microhenrys and C is 9 picofarads?
• A-001-004-004 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 30 picofarads?
• A-001-004-005 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 15 microhenrys and C is 5 picofarads?
• A-001-004-006 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 3 microhenrys and C is 40 picofarads?
• A-001-004-007 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 40 microhenrys and C is 6 picofarads?
• A-001-004-008 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 10 microhenrys and C is 50 picofarads?
• A-001-004-009 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 200 microhenrys and C is 10 picofarads?
• A-001-004-010 What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 90 microhenrys and C is 100 picofarads?
• A-001-004-011 What is the value of inductance (L) in a parallel RLC circuit, if the resonant frequency is 14.25 MHz and C is 44 picofarads?
• A-001-005-001 What is the Q of a parallel RLC circuit, if it is resonant at 14.128 MHz, L is 2.7 microhenrys and R is 18 kilohms?
• A-001-005-002 What is the Q of a parallel RLC circuit, if it is resonant at 14.128 MHz, L is 4.7 microhenrys and R is 18 kilohms?
• A-001-005-003 What is the Q of a parallel RLC circuit, if it is resonant at 4.468 MHz, L is 47 microhenrys and R is 180 ohms?
• A-001-005-004 What is the Q of a parallel RLC circuit, if it is resonant at 14.225 MHz, L is 3.5 microhenrys and R is 10 kilohms?
• A-001-005-005 What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 8.2 microhenrys and R is 1 kilohm?
• A-001-005-006 What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 10.1 microhenrys and R is 100 ohms?
• A-001-005-007 What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 12.6 microhenrys and R is 22 kilohms?
• A-001-005-008 What is the Q of a parallel RLC circuit, if it is resonant at 3.625 MHz, L is 3 microhenrys and R is 2.2 kilohms?
• A-001-005-009 What is the Q of a parallel RLC circuit, if it is resonant at 3.625 MHz, L is 42 microhenrys and R is 220 ohms?
• A-001-005-010 What is the Q of a parallel RLC circuit, if it is resonant at 3.625 MHz, L is 43 microhenrys and R is 1.8 kilohms?
• A-001-005-011 Why is a resistor often included in a parallel resonant circuit ?