Automation System
For a type 1 system, the steady-state:

None of these
error for a step input is always zero
(a) and (c)
error for a velocity input is always zero
input for acceleration input is always non-zero

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Automation System
A stepping motor;

has a commutator
None of these
is a good choice where continuous rotation is needed
can index positional movement.
has a speed proportional to voltage input

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Automation System
Time proportioning control:

None of these
is less efficient than normal PID control
a and b above.
cannot use a TM990 micro¬computer
can be used on a PM550 programmable process controller

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