Automatic Control Systems - ECE Questions and Answers

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A stepper motor is

a two phase induction motor

is a kind of rotating amplifier

is an electromagnetic transducer used to convert an angular position of shaft into electrical signal

is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis

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In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if

X² = R

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In the given figure, the input frequency is such that R = X_C. Then

v₀ lags v_i by 45°

v₀ lags v_i by 90°

v₀ leads v_i by 45°

v₀ leads v_i by 90°

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From the noise point of view, bandwidth should

be large

not be too large

should be as large as possible

should be infinite

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First column elements of Routh's tabulation are 3, 5, , 2. It means that there

is one root in left half s plane

are two roots in left half s plane

are two roots in right half s plane

is one root in right half s plane

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When a unit step voltage drives a lag network the output

remains constant at unit step value

increases exponentially from zero to final value

decreases exponentially from 1 to 0

either (b) of (c) depending on values of R and C

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For the given figure C(s)/R(s)

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For the circuit in the given figure,

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A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is

stable

unstable

limitedly stable

either (a) or (c)