1- Stepper motors of the same faceplate size but longer length a) Offer no diffe

Question

1- Stepper motors of the same faceplate size but longer length
a) Offer no difference in performance
b) Generally run at higher speed
c) Are generally capable of producing more torque
d) Generally run at lower speed
e) Generally run at longer period of time.

2- To increase the power of a stepper or servo motor without increasing the frame size:
a) This cannot be done, power is limited by frame size
b) A motor of a higher voltage may be specified
c) A motor can be operated above rated voltage to provide more power
d) A motor of a lower voltage may be specified
e) A motor can be operated below rated voltage to provide more power

3- For an intermittent load, such as a manual lathe, which method should be used to size the motor:
a) The motor’s nominal size should match the minimum load
b) The motor’s nominal size should match the RMS horsepower calculated based on the anticipated loads
c) The motor’s nominal size should match the maximum anticipated load
d) Any available motor can be used, the operator will adapt their work methods

4- A motor is running at 90% of its nameplate voltage. Compared to running under the same condition at 100% of name plate voltage you expect the temperature to:
a) Increase
b) Decrease
c) Remain the same

5- A motor is running at 90% of its nameplate voltage. Compared to running under the same condition at 100% of name plate voltage you expect the current to:
a) Increase
b) Decrease
c) Remain the same

6- A motor is running at 90% of its nameplate voltage. Compared to running under the same condition at 100% of name plate voltage you expect the speed to:
a) Increase
b) Decrease
c) Remain the same

7- A motor is running at 110% of its nameplate voltage. Compared to running under the same condition at 100% of name plate voltage you expect the starting torque to:
a) Increase
b) Decrease
c) Remain the same

8- Motors with the same NEMA frame size are:
a) Electrically interchangeable (identical voltage and current ratings)
b) Mechanically interchangeable (same mounting hole locations and shaft size)
c) Mechanically interchangeable (same speed and horsepower rating)
d) Both electrically and mechanically interchangeable
e) The same colour

9- Which is not a component of a DC motor:
a) Field Winding
b) Squirrel Cage Rotor
c) Armature winding
d) Brushes
e) Commutator

10- In a permanent magnet DC motor the magnets take the place of the:
a) field Winding
b) Armature Winding
c) Bearings

Explanation / Answer

1) For a stepper motor;

As a thumb rule the available torque output from a motor of one faceplate size is directly proportional to the body length.

Thus, the answer is

c) Are generally capable of producing more torque

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