Motor Speed and Torque Quiz

What happens to a motor's speed when it is loaded with no torque?

• It stops completely

• It runs at stall speed

• It runs at no-load speed

• It runs at half speed

The relationship between speed and torque in a motor is:

• Exponential

• Logarithmic

• Parabolic

• Linear

When does a motor produce zero power?

• At maximum torque

• At half speed only

• When either torque or speed is zero

• At minimum efficiency

Maximum power in a motor occurs at:

• Full stall torque

• One-quarter of stall torque

• Three-quarters of stall torque

• Half of stall torque

In the formula P = τ · ω, what does ω represent?

• Work

• Angular speed

• Torque

• Power

Power in a motor can be calculated using:

The torque at maximum power is:

• Equal to stall torque

• Double the stall torque

• Half the stall torque

• One-third the stall torque

What is no-load current in an electric motor?

• The current drawn when the motor is operating at maximum speed

• The current drawn when the motor has no mechanical load

• The current drawn when the motor is stalled

• The current drawn at maximum efficiency

The stall torque of a motor occurs when:

• The motor reaches maximum speed

• The motor draws minimum current

• The shaft stops rotating completely

• The motor operates at peak efficiency

Maximum efficiency in an electric motor typically occurs at:

• 75-85% of no-load speed

• 100% of no-load speed

• 25-35% of no-load speed

• 0% of no-load speed