IDA-201 Unit 18

Which of the following voltages are not safe for a 208-V motor to operate?

• 170 Volts and 238 Volts
• 170 Volts
• 238 Volts
• 220 Volts

If the voltage supplied to the motor is well below the motor rated voltage, the current draw will be ____ it should be.

• higher than
• lower than
• the same as
• in reverse polarity than

The voltage tolerance of a standard electric motor is ____.

• +10% -10%
• +5% -10%
• +10% -5%
• +15% -15%

The locked-rotor amperage is normally ____ times as great as the run-load amperage.

• 5
• 2
• 3
• 10

The motor that should be used in a potentially wet area is a(n) ____ motor.

• drip proof
• enclosed
• explosion proof
• open

When referring to motors, to what does the "insulation class" relate?

• the normal operating temperature of the motor
• the noise level of the motor
• the type of base on which the motor is mounted
• None of the above

A sleeve bearing would typically be used in a motor that operates with a ____.

• light load and where noise is a factor
• heavy load and where noise is a factor
• heavy load in a dirty atmosphere
• heavy load in a moist atmosphere

A slotted screw at the bottom of the bearing housing is called a ____.

• relief plug
• purge screw
• drain plug
• retaining screw

A direct-drive motor is usually connected to a load with a ____.

• coupling
• cradle mount
• rigid base mount
• pulley

Grounding straps are required on resilient mounted motors to ____.

• ground the motor in case of winding failure
• prevent rotation of the motor in the mount
• help reduce motor vibration transfer to the object on which the motor is mounted
• act as the position for locating the motor leads