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# Automatic Control Systems Online Exam Quiz

Important questions about Automatic Control Systems. Automatic Control Systems MCQ questions with answers. Automatic Control Systems exam questions and answers for students and interviews.

Options

A : 0

B : 1

C : 10

D : 0.5

Options

A : K > 20

B : 15 < K < 19

C : 8 ? K ? 14

D : K < 6

### 4. Stepper motors find applications in

Options

A : X-Y plotters

B : numerically controlled machining equipment

C : printers

D : all of the above

### 5. The log magnitude curve for a constant gain K is a

Options

A : horizontal straight line

B : horizontal straight line of magnitude 20 log K decibels

C : an inclined line having slope K

D : an inclined line having slope -K

### 7. In an integral controller

Options

A : the output is proportional to input

B : the rate of change of output is proportional to input

C : the output is proportional to rate of change of input

D : none of the above

### 9. Whether a linear system is stable or unstable that it

Options

A : is a property of the system only

B : depends on the input function only

C : both (a) and (b)

D : either (a) or (b)

### 2. Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions. Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by j ?

Options

A : Both A and R are correct and R is correct explanation of A

B : Both A and R are correct but R is not correct explanation of A

C : A is correct but R is wrong

D : R is correct but A is wrong

### 4. A lag compensator is essentially a

Options

A : low pass filter

B : high pass filter

C : band pass filter

D : either (a) or (b)

### 7. A system has its two poles on the negative real axis and one pair of poles lies on j ? axis. The system is

Options

A : stable

B : unstable

C : limitedly stable

D : either (a) or (c)

### 8. For type 2 system, the magnitude and phase angle of the term ( j ?) 2 in the denominator, at ? = 0, are respectively

Options

A : 0 and - 90°

B : 0 and + 90°

C : infinity and - 180°

D : infinity and + 180°

### 9. Bellows converts

Options

A : pressure difference into displacement

B : pressure difference into voltage

C : displacement into pressure difference

D : either (a) or (c)

### 3. In Bode diagram (log magnitude plot) the factor in the transfer function gives a line having slope

Options

A : -20 dB per octave

B : -10 dB per octave

C : -6 dB per octave

D : -2 dB per octave

### 8. Bode magnitude plot is drawn between

Options

A : magnitude of network function and ?

B : dB magnitude and log ?

C : dB magnitude and ?

D : log e (magnitude) and log ?

### 9. If a system is to follow arbitrary inputs accurately the bandwidth should be

Options

A : large

B : small

C : very small

D : neither small nor large

### 1. A stepper motor is

Options

A : a two phase induction motor

B : is a kind of rotating amplifier

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

D : 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

Options

A : True

B : False

C :

D :

### 9. From the noise point of view, bandwidth should

Options

A : be large

B : not be too large

C : should be as large as possible

D : should be infinite

### 10. Assertion (A): Potentiometers can not be used as error detectors in position control systems. Reason (R): The resolution of a potentiometer places an upper limit on its accuracy

Options

A : Both A and R are correct and R is correct explanation of A

B : Both A and R are correct but R is not correct explanation of A

C : A is correct but R is wrong

D : R is correct but A is wrong

Options

A : a. A

B : b. B

C : c. C

D : d. D

### For the system in the given figure. The transfer function C(s)/R(s) is

Options

A : a. G1 + G2 + 1

B : b. G1 G2 + 1

C : c. G1 G2 + G2 + 1

D : d. G1 G2 + G1 + 1