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
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2) _______________is an open loop control system? a. Ward Leonard control b. Field controlled D.C. motor c. Stroboscope d. Metadyne
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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
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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
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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
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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
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7) A.C. servomotor resembles_____________? a. two phase induction motor b. Three phase induction motor c. direct current series motor d. universal motor
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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
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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
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10) Regenerative feedback implies feedback with_______________? a. oscillations b. step input c. negative sign d. positive sign
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11) increases the steady state accuracy? a. Integrator b. Differentiator c. Phase lead compensator d. Phase lag compensator
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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
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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
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14) The transient response, with feedback system_____________? a. rises slowly b. rises quickly c. decays slowly d. decays quickly
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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
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16) A controller, essentially, is a________________? a. sensor b. clipper c. comparator d. amplifier
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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
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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
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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
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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
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