Question 1

Escalating energy costs have made efficiency an important consideration in determining which adjustable is best suited for a specific application.&#10;A)accelerating relay&#10;B)voltage control&#10;C)current sensor&#10;D)speed controller

Accepted Answer

Escalating energy costs indicate that energy efficiency is important, and therefore a speed controller would be the most appropriate choice. A speed controller allows for optimal energy consumption by regulating the speed of the motor or equipment. The escalating energy costs make efficiency an important consideration for adjustable speed controllers. Adjustable speed controllers can optimize energy consumption and reduce costs by adjusting the speed of motors and machines to the actual process requirements. Therefore, D (speed controller) is the best choice.

Question 2

Speed control is accomplished by controlling motor rotor current, thereby controlling .&#10;A)motors located remotely&#10;B)the SCR&#180;s output voltage&#10;C)the motor torque&#10;D)the operation of relays

Accepted Answer

Controlling the motor rotor current will allow for control over the motor torque, which in turn will control the speed of the motor. The other options are not directly related to speed control. Controlling the motor rotor current controls the amount of torque produced by the motor, which in turn controls the speed of the motor. Therefore, the correct choice is C - the motor torque.

Question 3

Circuit cards may also be called .&#10;A)modules&#10;B)packets&#10;C)kits&#10;D)units

Accepted Answer

While "packets," "kits," and "units" could all refer to electronic components or devices, "modules" is the most commonly used term for circuit cards. While all of the answer choices could potentially refer to some component of a circuit board, "modules" is the most commonly used term to describe a specialized component or subsystem of a circuit board. "Packets" typically refers to data packets in networking, "kits" usually refers to collections of components for assembly, and "units" is a more general term that could refer to any individual component of a device or system.

Question 4

Electronic circuitry is arranged on plug-in circuit cards.

Accepted Answer

Electronic circuitry is often arranged on plug-in circuit cards or modules to allow for easy replacement, maintenance, and upgrades. Plug-in circuit cards, also known as circuit boards, are a common way to arrange electronic circuits for easy installation and replacement.

Question 5

Starting resistors are required for reduced speed range systems only.

Accepted Answer

Starting resistors are used to control the starting current of motors in reduced speed range systems. In high speed range systems, the motor can start without the need for starting resistors. Starting resistors are used to reduce starting current in induction motors for reduced speed range systems, such as those with variable frequency drives or wound rotor motors. They are not required for standard full-speed motors.

Question 6

All controller startup adjustments are located on a startup adjust card.

Accepted Answer

Controller startup adjustments can be located on various components and devices within the controller, not just on a single card. Startup adjustments can vary depending on the specific controller and may be located in different places, not necessarily limited to a single adjustment card.

Question 7

Electronic cards are coated to protect against damage due to a hot environment.

Accepted Answer

The answer of Electronic cards are coated to protect against...

Question 8

An ideal solid-state adjustable speed controller is a modern, energy-saving method of controlling motor speed.

Accepted Answer

A solid-state adjustable speed controller uses power electronics to adjust the speed of an AC or DC motor, and it offers significant energy savings compared to traditional methods like throttling. A solid-state adjustable speed controller is a modern and energy-efficient way to control the speed of motors. It uses semiconductor devices like transistors, thyristors, and diodes to control the AC or DC motor's speed. These controllers offer precise control and better efficiency than traditional methods like using resistors or changing the number of poles in the motor.

Question 9

Card-edge connectors are generally coated to ensure reliable contact between the card and the rack terminals.&#10;A)silver&#10;B)gold&#10;C)copper&#10;D)zinc

Accepted Answer

Gold is a popular choice for coating card-edge connectors because it is corrosion-resistant and has excellent conductivity, ensuring reliable contact between the card and the rack terminals. Gold is the best choice for coating card-edge connectors as it is highly conductive and does not corrode or tarnish easily, ensuring reliable contact over time.

Question 10

Power factor correction is recommended for slip power recovery systems.&#10;A)very few&#10;B)some&#10;C)most&#10;D)all

Accepted Answer

Power factor correction is recommended for all slip power recovery systems to improve their efficiency and reduce losses.

Deck 38: Solid-State Adjustable Speed Controller for Ac Wound Rotor Motors