204.  State/variable approach may be applied to
A. time variant systems
B. nonlinear systems
C. linear and time variant systems
D. all of these

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205.  In a control system, friction coefficient is usually kept low to
A. maximize the velocity-lag error of the system
B. minimize the velocity-lag error of the system
C. maximize the speed of response of the system
D. minimize the time constant of the system

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206.  AC system are usually preferred to the DC systems in control applications because
A. AC systems are cheaper
B. AC systems are more stable
C. AC systems have better performance characteristics and are smaller in size k
D. all of these

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207.  For large power control applications
A. AC systems are more suited
B. DC systems are more suited
C. both AC and DC systems may be used efficiently
D. neither AC nor DC system is preferred

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208.  Principle advantage of hydraulic system over electrical system is that the former has
A. smaller response time
B. greater flexibility of operation
C. smaller size for the same power
D. none of these

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209.  In hydraulic control system, power is transmit-ted through
A. mechanical gears
B. shafts
C. fluid under pressure
D. none of these

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210.  Time sharing of an expensive control system can be achieved by using
A. an AC control system
B. an analog control system
C. a sampled data control system
D. none of these

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