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Question 1
A _____ gear is similar to a spur gear except that its teeth are cut at an angle to the gears axis.
Correct Answer:
Helical
Explanation:
Teeth cut at an angle to the gear’s axis define a helical gear. That angled tooth arrangement means the gear engages gradually as it turns, so multiple teeth share the load at any given time. This results in smoother, quieter operation and higher load capacity than a straight-toothed spur gear, which has teeth that run parallel to the axis and engage all at once. Bevel gears are cut on a conical surface to mesh at angles to the shafts; hypoid gears are like bevels but with offset axes. The described feature—teeth inclined to the axis—fits a helical gear.
Question 2
Diametral pitch relates to which characteristic of gear teeth?
Correct Answer:
Tooth Size
Explanation:
Diametral pitch describes how large or small the gear teeth are by counting how many teeth fit in one inch of the gear’s pitch diameter. In other words, it specifies tooth size and spacing at the pitch circle. Gears that mesh must share the same diametral pitch, or they won’t engage properly. The other options aren’t about tooth size: lubricant viscosity affects lubrication, shaft diameter concerns overall size, and bearing clearance deals with gaps and fits.
Question 3
As the torque on an electric motor increases, what happens to the current?
Correct Answer:
The current increases
Explanation:
Torque in an electric motor is produced by current through the windings, and the torque is proportional to that current. When more torque is required, the motor draws more current to generate it. With a fixed supply voltage, increasing load tends to slow the motor, which reduces back EMF. Less back EMF means less opposing voltage inside the motor, so more current can flow, raising torque again until a new balance is reached. The winding voltage itself doesn’t have to rise, and speed typically falls under heavier torque rather than increasing. So the current increases.
Question 4
A common disadvantage of helical gears is the presence of which axial force?
Correct Answer:
Side thrust
Explanation:
When teeth are cut on a helix, the contact force between gears isn’t directed purely perpendicular to the gear faces. Instead, it has a component along the gear axis. That axial component is a thrust, or axial thrust, on the shaft. Because of the helix angle, this thrust increases with both the angle and the transmitted load, so larger helices push harder along the shaft. This is a disadvantage because it adds a longitudinal load that bearings and housings must support, often requiring thrust bearings or other restraints to keep everything aligned. Pitting, wear, and noise are concerns in gear operation too, but they aren’t the axial force produced by the angled teeth.
Question 5
One revolution per second is equal to how many RPM?
Correct Answer:
60 RPM
Explanation:
Converting revolutions per second to revolutions per minute. There are 60 seconds in a minute, so multiply by 60. One revolution each second equals 60 revolutions per minute, or 60 RPM. If you were counting per hour, you’d multiply by 3600, but RPM is per minute. A value of 120 RPM would mean two revolutions per second (since 120 ÷ 60 = 2).
Question 1
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About this Exam

Prepare with the Introduction to Industrial Maintenance Practice Test practice quiz. This question bank includes 10 questions covering gear, teeth, gears, motor, and defined. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Introduction to Industrial Maintenance Practice Test

This practice set contains 10 questions from the matching question bank and focuses on gear, teeth, gears, motor, and defined. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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