Control Systems Mcqs - Set 2

1)   The band width, in a feedback amplifier_______________?

a. remains unaffected
b. decreases by the same amount as the gain increase
c. increases by the sane saaaajajt as the gain decrease
d. decreases by the same amount as the gain decrease
Answer  Explanation 

ANSWER: increases by the sane saaaajajt as the gain decrease

Explanation:
No explanation is available for this question!


2)   _______________is an open loop control system?

a. Ward Leonard control
b. Field controlled D.C. motor
c. Stroboscope
d. Metadyne
Answer  Explanation 

ANSWER: Field controlled D.C. motor

Explanation:
No explanation is available for this question!


3)   As a result of introduction of negative feedback which of the following will not decrease ?

a. Band width
b. Overall gain
c. Distortion
d. Instability
Answer  Explanation 

ANSWER: Band width

Explanation:
No explanation is available for this question!


4)   Zero initial condition for a system means_______________?

a. input reference signal is zero
b. zero stored energy
c. an initial movement of moving parts
d. system is at rest and no energy is stored in any of its components
Answer  Explanation 

ANSWER: system is at rest and no energy is stored in any of its components

Explanation:
No explanation is available for this question!


5)   Transfer function of a system is used to calculate which of the following ?

a. The order of the system
b. The time constant
c. The output for any given input
d. The steady state gain
Answer  Explanation 

ANSWER: The output for any given input

Explanation:
No explanation is available for this question!


6)   The output of a feedback control system must be a function of_________________?

a. reference and output
b. reference and input
c. input and feedback signal
d. output and feedback signal
Answer  Explanation 

ANSWER: reference and output

Explanation:
No explanation is available for this question!


7)   A.C. servomotor resembles_____________?

a. two phase induction motor
b. Three phase induction motor
c. direct current series motor
d. universal motor
Answer  Explanation 

ANSWER: two phase induction motor

Explanation:
No explanation is available for this question!


8)   A control system with excessive noise, is likely to suffer from_______________?

a. saturation in amplifying stages
b. loss of gain
c. vibrations
d. oscillations
Answer  Explanation 

ANSWER: saturation in amplifying stages

Explanation:
No explanation is available for this question!


9)   On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?

a. Frequency
b. Loop gain
c. Forward gain
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


10)   Regenerative feedback implies feedback with_______________?

a. oscillations
b. step input
c. negative sign
d. positive sign
Answer  Explanation 

ANSWER: positive sign

Explanation:
No explanation is available for this question!


11)   increases the steady state accuracy?

a. Integrator
b. Differentiator
c. Phase lead compensator
d. Phase lag compensator
Answer  Explanation 

ANSWER: Integrator

Explanation:
No explanation is available for this question!


12)   The second derivative input signals modify which of the following ?

a. The time constant of the system
b. Damping of the system
c. The gain of the system
d. The time constant and suppress the oscillations
e. None of the above
Answer  Explanation 

ANSWER: The time constant and suppress the oscillations

Explanation:
No explanation is available for this question!


13)   Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?

a. The system is relatively stable
b. The system is highly stable
c. The system is highly oscillatory
d. None of the above
Answer  Explanation 

ANSWER: The system is highly oscillatory

Explanation:
No explanation is available for this question!


14)   The transient response, with feedback system_____________?

a. rises slowly
b. rises quickly
c. decays slowly
d. decays quickly
Answer  Explanation 

ANSWER: decays quickly

Explanation:
No explanation is available for this question!


15)   Which of the following statements is correct for any closed loop system ?

a. All the co-efficients can have zero value
b. All the co-efficients are always non-zero
c. Only one of the static error co-efficients has a finite non-zero value
d. None of the above
Answer  Explanation 

ANSWER: Only one of the static error co-efficients has a finite non-zero value

Explanation:
No explanation is available for this question!


16)   A controller, essentially, is a________________?

a. sensor
b. clipper
c. comparator
d. amplifier
Answer  Explanation 

ANSWER: comparator

Explanation:
No explanation is available for this question!


17)   In a stable control system backlash can cause which of the following ?

a. Underdamping
b. Overdamping
c. Poor stability at reduced values of open loop gain
d. Low-level oscillations
Answer  Explanation 

ANSWER: Low-level oscillations

Explanation:
No explanation is available for this question!


18)   In a control system the output of the controller is given to_____________?

a. final control element
b. amplifier
c. comparator
d. sensor
e. none of the above
Answer  Explanation 

ANSWER: final control element

Explanation:
No explanation is available for this question!


19)   Due to which of the following reasons excessive bond width in control systems should be avoided ?

a. It leads to slow speed of response
b. It leads to low relative stability
c. Noise is proportional to band width
d. None of the above
Answer  Explanation 

ANSWER: Noise is proportional to band width

Explanation:
No explanation is available for this question!


20)   In an automatic control system which of the following elements is not used ?

a. Error detector
b. Final control element
c. Sensor
d. Oscillator
Answer  Explanation 

ANSWER: Oscillator

Explanation:
No explanation is available for this question!