There are several ways to construct a stepper motor to achieve digitally control

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Question
There are several ways to construct a stepper motor to achieve digitally controlled stepping action. One possibility is to construct four stator coils set up as four pole pairs, each 45� apart and using three ferromagnetic pairs spaced 60� apart.
Options
A. True
B. False

Correct Answer

True

More questions

4. A counter-ramp ADC stops counting when ________.
Options
A. the input voltage equals the DAC staircase voltage
B. the counter reaches a maximum count
C. the input voltage equals 5 volts
D. the DAC staircase voltage equals 5 volts

5. With regard to a D latch, ________.
Options
A. the Q output follows the D input when EN is LOW
B. the Q output is opposite the D input when EN is LOW
C. the Q output follows the D input when EN is HIGH
D. the Q output is HIGH regardless of EN's input state

6. The device shown in the given figure is checked with a logic probe and the output is HIGH.
Options
A. The device is working properly.
B. For the input conditions shown the output should be LOW; the input is shorted to ground.
C. For the input conditions shown the output should be neither HIGH nor LOW; the device is shorted to .
D. The device is probably alright; the problem is most likely caused by the stage connected to the output of the device.

7. What is the current in R₁ and the current in R₂ for the circuit shown below?
Options
A. I₁ = 0.416 mA, I₂ = 0.416 mA
B. I₁ = 0.357 mA, I₂ = 0.357 mA
C. I₁ = 1.25 mA, I₂ = 0.625 mA
D. I₁ = 0.625 mA, I₂ = 1.25 mA

8. Referring to the given figure, what should the display on the scope look like if the A/D converter is working properly?
Options
A. It should be a circular Lissajous pattern resulting from the simultaneous application of ramps to the vertical and horizontal inputs of the oscilloscope.
B. The pattern should be a straight line across the screen due to the equal but opposite voltages being applied to the scope inputs.
C. A uniform stairstep pattern should be displayed.
D. The scope should display a sequential binary count with the LSB on the left and the MSB on the right side of the display.

9. Referring to the given figure, what appears to be wrong, if anything, with the output of the D/A converter?
Options
A. The input signal is probably noisy.
B. There appears to be some nonlinearity in the scope display.
C. The converter has a nonmonotonic output error.
D. It appears that certain input codes are incorrect; double-check the input coding.

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