Question 1

In a Current Source Inverter, ____________________ is controlled while the voltage is varied to satisfy the motor's needs.

Accepted Answer

current

Question 2

A chopper circuit is used to ____.

Accepted Answer

A)  change AC to DC 
B)  change DC to AC 
C)  change pulsating DC into steady DC 
D)  change steady DC into pulsating DC 
A)  change AC to DC 
B)  change DC to AC 
C)  change pulsating DC into steady DC 
D)  change steady DC into pulsating DC D

Question 3

PWM stands for ____.

Accepted Answer

A)  permanent magnet motor 
B)  perfectly whirling machine 
C)  partial winding motor 
D)  pulse-width modulation 
A)  permanent magnet motor 
B)  perfectly whirling machine 
C)  partial winding motor 
D)  pulse-width modulation D

Question 4

A step change is a(n) ____________________ in the motor rotation due to an advancement in the flux field.

Accepted Answer

The answer of A step change is a(n) ____________________ in...

Question 5

Which inverter cannot operate from battery power?

Accepted Answer

A)  Chopper-controlled VVI 
B)  Phase-controlled CSI 
C)  Chopper-controlled CSI 
D)  PWM 
A)  Chopper-controlled VVI 
B)  Phase-controlled CSI 
C)  Chopper-controlled CSI 
D)  PWM

Question 6

When using a DC motor with a DC drive, the most common DC motor connection is the ____.

Accepted Answer

A)  series wound DC motor 
B)  self-excited shunt wound DC motor 
C)  separately excited DC motor 
D)  compound wound DC motor 
A)  series wound DC motor 
B)  self-excited shunt wound DC motor 
C)  separately excited DC motor 
D)  compound wound DC motor

Question 7

The function of the converter is to ____.

Accepted Answer

A)  convert AC to DC 
B)  convert DC to AC 
C)  filter the DC 
D)  filter the AC 
A)  convert AC to DC 
B)  convert DC to AC 
C)  filter the DC 
D)  filter the AC

Question 8

The AC sine wave supplied to the motor is artificially produced by an inverter stage in the flux vector drive.

Accepted Answer

A) True 
 B)False

Question 9

The inverter stage in a flux vector drive allows ____.

Accepted Answer

A)  control over the synthetic AC 
B)  AC to be turned into DC current 
C)  current to be stepped down 
D)  voltage to be removed 
A)  control over the synthetic AC 
B)  AC to be turned into DC current 
C)  current to be stepped down 
D)  voltage to be removed

Question 10

The best definition of torque is ____.

Accepted Answer

A)  an opposing voltage produced in the motor's armature 
B)  the difference between the actual speed and the desired speed of a motor 
C)  an undesirable phenomenon, and steps should be taken to eliminate it 
D)  the turning force produced by a motor 
A)  an opposing voltage produced in the motor's armature 
B)  the difference between the actual speed and the desired speed of a motor 
C)  an undesirable phenomenon, and steps should be taken to eliminate it 
D)  the turning force produced by a motor

Question 11

All types of VVIs provide ____________________ protection.

Accepted Answer

The answer of All types of VVIs provide ____________________ protection....

Question 12

The voltage that is set for the desired speed of the motor is called the ____.

Accepted Answer

A)  feedback signal 
B)  error signal 
C)  reference signal 
D)  sawtooth signal 
A)  feedback signal 
B)  error signal 
C)  reference signal 
D)  sawtooth signal

Question 13

____________________ drives operate by monitoring rotor position and changing the rotor's position as compared to its orientation to the stator field.

Accepted Answer

The answer of ____________________ drives operate by monitoring rotor position...

Question 14

The signal that represents the difference between the control signal and the feedback signal is called the ____.

Accepted Answer

A)  feedback signal 
B)  error signal 
C)  reference signal 
D)  sawtooth signal 
A)  feedback signal 
B)  error signal 
C)  reference signal 
D)  sawtooth signal

Question 15

The DC link is also called ____.

Accepted Answer

A)  the DC bus 
B)  the converter 
C)  the inverter 
D)  pulsating DC 
A)  the DC bus 
B)  the converter 
C)  the inverter 
D)  pulsating DC

Exam 24: Electronic Variable Speed Drives

In a Current Source Inverter, ____________________ is controlled while the voltage is varied to satisfy the motor's needs.

A chopper circuit is used to ____.

PWM stands for ____.

A step change is a(n) ____________________ in the motor rotation due to an advancement in the flux field.

Which inverter cannot operate from battery power?

When using a DC motor with a DC drive, the most common DC motor connection is the ____.

The function of the converter is to ____.

The AC sine wave supplied to the motor is artificially produced by an inverter stage in the flux vector drive.

The inverter stage in a flux vector drive allows ____.

The best definition of torque is ____.

All types of VVIs provide ____________________ protection.

The voltage that is set for the desired speed of the motor is called the ____.

____________________ drives operate by monitoring rotor position and changing the rotor's position as compared to its orientation to the stator field.

The signal that represents the difference between the control signal and the feedback signal is called the ____.

The DC link is also called ____.

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