Question 1

In a few cases, industrial machines require power at slow speeds and high torque.

Accepted Answer

False

Question 2

Gear motors are available in many of the standard motor types, but run only at constant speeds.

Accepted Answer

Gear motors have a gearbox attached to the motor shaft, which allows for different output speeds and torque. Therefore, gear motors can run at variable speeds, not just constant speeds. Gear motors can run at different speeds depending on the gear ratio and load, but they cannot vary their speeds on their own like variable speed motors can.

Question 3

At speeds of 780 rpm and less, the following drives may be prudently used: chain drive, belt drive, separate speed reducer coupled to the motor, or motor.&#10;A)multispeed&#10;B)synchronous&#10;C)gear&#10;D)reverse

Accepted Answer

At speeds of 780 rpm and less, a gear motor is the best choice as it provides direct power transmission and can handle heavy loads with high torque requirements. Chain and belt drives are susceptible to slippage and require constant tension adjustment. Separate speed reducers coupled to the motor can be bulky, costly, and require more maintenance. Multispeed motors are not suited for constant speed applications and may cause instability. Synchronous motors are designed for constant speed and are not suitable for applications requiring adjustable speeds. Reverse motors are not a type of motor but a feature that allows the motor to run in the opposite direction. At speeds of 780 rpm and less, gear drive is the most preferred option. It provides high output torque and high efficiency even at low speeds. Chain and belt drives are not suitable for low speeds as they tend to slip, causing loss of power and efficiency. Separate speed reducers coupled to the motor may also work but can be more expensive and require more maintenance compared to gear drives. Multispeed and synchronous motors are not relevant options for low speeds. Reverse motors are not a viable option for driving machinery.

Question 4

One-unit gear motors are available with horsepower ratings ranging from approximately 1/6 hp to hp.&#10;A)50&#10;B)100&#10;C)150&#10;D)200

Accepted Answer

The answer of One-unit gear motors are available with horsepower...

Question 5

In gearing, as the output speed is decreased, the torque is increased.

Accepted Answer

This is a basic principle of gearing - as the output speed decreases due to a larger gear ratio, the torque at the output shaft increases. This is a fundamental principle of gearing - as the output speed decreases, the torque at the output increases according to the gear ratio. This allows for the transmission of power from a smaller, faster input to a larger, slower output.

Question 6

A gear motor is larger than a low-speed standard motor of the same horsepower.

Accepted Answer

Gear motors are designed to provide high torque at low speeds, which often allows them to be more compact than standard motors of the same horsepower, especially when the gear reduction is integrated into the motor's design.

Question 7

Because the amount of power lost in gearing is very small, the multiple drive has essentially horsepower.&#10;A)low&#10;B)constant&#10;C)high&#10;D)variable

Accepted Answer

The statement suggests that the amount of power lost in gearing is very small, therefore the multiple drive has essentially constant horsepower. The statement mentions that the amount of power lost in gearing is very small. This means that the multiple drive has a constant horsepower, as the power output is not significantly reduced due to gearing.

Question 8

For 24-hour operation under moderate shock conditions, or 8-hour operation under heavy shock conditions, you need a ____ gear.&#10;A)Class I&#10;B)Class II&#10;C)Class III&#10;D)Class IV

Accepted Answer

For 24-hour operation under moderate shock conditions or 8-hour operation under heavy shock conditions, a Class III gear is recommended. Class III gears can withstand higher shock loads and are designed to be used in applications where shock and impact are present. Class III gear is designed for continuous use under moderate to heavy shock conditions, making it the best choice for 24-hour operation under moderate shock or 8-hour operation under heavy shock. Class I and II gears are designed for lighter and intermittent use and Class IV gear is designed for extreme shock conditions, making them not suitable for this specific scenario.

Question 9

The gear motor is a speed-reducing motor.

Accepted Answer

This statement is true. A gear motor is designed to reduce the speed of the motor while increasing torque. It achieves this by using gears to transmit motion from the motor to the output shaft. A gear motor has a geared transmission that reduces the output speed of the motor in order to increase the torque. Therefore, it is a speed-reducing motor.

Question 10

A gear motor usually consists of a AC or DC motor and a sealed gear train correctly engineered for the load.&#10;A)complex&#10;B)very small&#10;C)standard&#10;D)very large

Accepted Answer

A gear motor typically consists of a standard AC or DC motor and a properly designed gear train for the specific load requirements. While complex or very large motors may be used in some applications, a standard motor is often the best choice for many gear motor applications. Very small motors may not provide enough power to drive the gear train effectively. A gear motor typically consists of a standard AC or DC motor and a sealed gear train designed to handle the appropriate load. While complex or very large motors may be used in some specialized applications, a standard motor is typically sufficient for many general purposes. Very small motors may not provide enough power for some applications.

Deck 53: Gear Motors