Question 1

-If the diode opens in Figure 16-1(b), the voltage across the diode is ________.

Accepted Answer

A) 4.3 V 
B) 0 V 
C) 0.7 V 
D) 1 V 
A) 4.3 V 
B) 0 V 
C) 0.7 V 
D) 1 V D

Question 2

If the cathode voltage of a forward-biased silicon diode equals 6.5 V, the anode voltage equals ________.

Accepted Answer

A) -0.7 V 
B) 7.2 V 
C) -7.2 V 
D) 0.7 V 
A) -0.7 V 
B) 7.2 V 
C) -7.2 V 
D) 0.7 V B

Question 3

A full-wave rectifier uses ________ diode(s) and its output frequency is ________ the input frequency.

Accepted Answer

A) two, equal to 
B) one, equal to 
C) two, twice 
D) one, twice 
A) two, equal to 
B) one, equal to 
C) two, twice 
D) one, twice C

Question 4

When a diode is forward biased it is ________.

Accepted Answer

A) blocking current 
B) conducting current 
C) similar to an open switch 
D) similar to a closed switch 
E) both B and D 
A) blocking current 
B) conducting current 
C) similar to an open switch 
D) similar to a closed switch 
E) both B and D

Question 5

If an aircraft full-wave, dc power supply operates from a 400 Hz sine wave, the ripple frequency is ________.

Accepted Answer

A) 60 Hz 
B) 800 Hz 
C) 120 Hz 
D) 400 Hz 
A) 60 Hz 
B) 800 Hz 
C) 120 Hz 
D) 400 Hz

Question 6

-If the diode is made of silicon in Figure 16-1(b), what is the current?

Accepted Answer

A) 9.4 mA 
B) 0 A 
C) 10 mA 
D) 8.6 mA 
A) 9.4 mA 
B) 0 A 
C) 10 mA 
D) 8.6 mA

Question 7

Varactor diodes are used as voltage-variable capacitors.

Accepted Answer

A) True 
 B)False

Question 8

-If the filter capacitor opens in Figure 16-2, ________.

Accepted Answer

A) the ripple voltage increases 
B) a loud hum will be heard 
C) the diodes would open 
D) the output dc will be very low 
A) the ripple voltage increases 
B) a loud hum will be heard 
C) the diodes would open 
D) the output dc will be very low

Question 9

The ripple frequency of a half-wave rectifier equals the supply frequency.

Accepted Answer

A) True 
 B)False

Question 10

-The output of Block 2 in Figure 16-2 is:

Accepted Answer

A) a steady DC voltage. 
B) a pulsating DC voltage. 
C) a steady DC current. 
D) a pulsating AC voltage. 
A) a steady DC voltage. 
B) a pulsating DC voltage. 
C) a steady DC current. 
D) a pulsating AC voltage.

Question 11

-Which block in Figure 16-2 changes ac to pulsating dc?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 12

Current through a diode is blocked by ________.

Accepted Answer

A) thermally produced electron-hole pairs 
B) reverse voltage across the diode 
C) forward voltage across the diode 
D) depletion layer breakdown 
A) thermally produced electron-hole pairs 
B) reverse voltage across the diode 
C) forward voltage across the diode 
D) depletion layer breakdown

Question 13

When the positive lead of an ohmmeter is connected to the cathode of a diode and the negative lead is connected to the anode, the meter reads ________.

Accepted Answer

A) an infinitely high resistance 
B) a very low resistance 
C)    
D) a gradually increasing resistance 
A) an infinitely high resistance 
B) a very low resistance 
C)    
D) a gradually increasing resistance

Question 14

If a half-wave rectifier outputs 36 VP, the PIV of the diode should be more than ________.

Accepted Answer

A) 29 V 
B) 36 V 
C) 15 V 
D) 116 V 
A) 29 V 
B) 36 V 
C) 15 V 
D) 116 V

Question 15

-What is the current in Figure 16-1(b) if the diode is made of silicon and the polarity of the source voltage is reversed?

Accepted Answer

A) 0.6 mA 
B) 5 mA 
C) 0 A 
D) 10 mA 
A) 0.6 mA 
B) 5 mA 
C) 0 A 
D) 10 mA

Question 16

-If the diode is silicon, what is the voltage across the resistor in Figure 16-1(a)?

Accepted Answer

A) 0 V 
B) 20 V 
C) 0.7 V 
D) 19.3 V 
A) 0 V 
B) 20 V 
C) 0.7 V 
D) 19.3 V

Question 17

-If the polarity of the silicon diode is reversed in Figure 16-1(c),   is ________.

Accepted Answer

A) 25 V 
B) 49.3 V 
C) 0.7 V 
D) 0 V 
A) 25 V 
B) 49.3 V 
C) 0.7 V 
D) 0 V

Question 18

To operate as a voltage regulator, a zener diode requires a:

Accepted Answer

A) series capacitor. 
B) transformer. 
C) silicon diode. 
D) series resistor. 
A) series capacitor. 
B) transformer. 
C) silicon diode. 
D) series resistor.

Question 19

Doping a semiconductor material with pentavalent impurities results in:

Accepted Answer

A) P-type material. 
B) N-P type material. 
C) P-N type material. 
D) N-type material. 
A) P-type material. 
B) N-P type material. 
C) P-N type material. 
D) N-type material.

Question 20

LEDs will emit light if a reverse voltage is applied to them.

Accepted Answer

A) True 
 B)False

Exam 16: RL Circuits

-If the diode opens in Figure 16-1(b), the voltage across the diode is ________.

If the cathode voltage of a forward-biased silicon diode equals 6.5 V, the anode voltage equals ________.

A full-wave rectifier uses ________ diode(s) and its output frequency is ________ the input frequency.

When a diode is forward biased it is ________.

If an aircraft full-wave, dc power supply operates from a 400 Hz sine wave, the ripple frequency is ________.

-If the diode is made of silicon in Figure 16-1(b), what is the current?

Varactor diodes are used as voltage-variable capacitors.

-If the filter capacitor opens in Figure 16-2, ________.

The ripple frequency of a half-wave rectifier equals the supply frequency.

-The output of Block 2 in Figure 16-2 is:

-Which block in Figure 16-2 changes ac to pulsating dc?

Current through a diode is blocked by ________.

When the positive lead of an ohmmeter is connected to the cathode of a diode and the negative lead is connected to the anode, the meter reads ________.

If a half-wave rectifier outputs 36 VP, the PIV of the diode should be more than ________.

-What is the current in Figure 16-1(b) if the diode is made of silicon and the polarity of the source voltage is reversed?

-If the diode is silicon, what is the voltage across the resistor in Figure 16-1(a)?

-If the polarity of the silicon diode is reversed in Figure 16-1(c), is ________.

To operate as a voltage regulator, a zener diode requires a:

Doping a semiconductor material with pentavalent impurities results in:

LEDs will emit light if a reverse voltage is applied to them.

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

Transformers

RC Circuits

RlC Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters

A full-wave rectifier uses diode(s) and its output frequency is the input frequency.