Question 1

The time constant of an inductor is:

Accepted Answer

A)  inversely proportional to the resistance in the circuit. 
B)  directly proportional to the inductance in the circuit. 
C)  the time required for voltage or current to increase to 63% or to decrease to 37%. 
D)  all of these. D

Question 2

If two 2.5 mH inductors are connected in series with a 4.7 k? resistor and the source voltage is 100 VDC, what is the circuit's maximum current?

Accepted Answer

A)  21.3 mA 
B)  1.1 mA 
C)  63.2 mA 
D)  7.9 mA A

Question 3

An 0.05 ?H inductance is larger than a ________.

Accepted Answer

A)  0.00005 H inductance 
B)  0.000000008 H inductance 
C)  0.000005 H inductance 
D)  0.0000005 H inductance B

Question 4

If a forward biased silicon diode is in series with a 22 k? resistor and a 10 V source, the voltage across the diode is ________ and the voltage across the resistor is ________.

Accepted Answer

A)  0.3 V, 9.7 V 
B)  0.7 V, 9.3 V 
C)  9.3 V, 0.7 V 
D)  9.7 V, 0.3 V

Question 5

The quality factor of a coil or inductor is calculated by:

Accepted Answer

A)  QL = 2? fL/RW. 
B)  QL =
  
C)  QL =
  
D)  QL = 2? fL.

Question 6

The formula for load regulation is:

Accepted Answer

A)   × 100% 
B)   × 100%. 
C)   × 100% 
D)   × 100%

Question 7

If a 15 ?H inductor has a 2.2 K? reactance, the frequency equals ________.

Accepted Answer

A)  4.28 kHz 
B)  23.3 MHz 
C)  23.3 kHz 
D)  4.28 MHz

Question 8

If the resonant frequency is 1 MHz and Q = 50, f1 = ________ and f2 = ________.

Accepted Answer

A)  0.99 MHz, 1.01 MHz 
B)  0.98 MHz, 1.01 MHz 
C)  0.98 MHz, 1.02 MHz 
D)  0.99 MHz, 1.02 MHz

Question 9

The formula for line regulation is:

Accepted Answer

A)   × 100%. 
B)   × 100%. 
C)   × 100%. 
D)   × 100%.

Exam 5: Inductors, Rlc Circuits, Resonancediodes and Applications

The time constant of an inductor is:

If two 2.5 mH inductors are connected in series with a 4.7 k? resistor and the source voltage is 100 V_DC, what is the circuit's maximum current?

An 0.05 ?H inductance is larger than a ________.

If a forward biased silicon diode is in series with a 22 k? resistor and a 10 V source, the voltage across the diode is and the voltage across the resistor is .

The quality factor of a coil or inductor is calculated by:

The formula for load regulation is:

If a 15 ?H inductor has a 2.2 K? reactance, the frequency equals ________.

If the resonant frequency is 1 MHz and Q = 50, f₁ = and f₂ = .

The formula for line regulation is: