DESIGN OF MASONRY STRUCTURES QUIZ

In control systems the output of sensor usually, is

Analog or digital electrical signal

Mechanical signal

Analog electrical signal

Digital electrical signal

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Which of the following is open loop system?

Aqualing

Wind screen wiper

Respiratory system of animal

System for controlling antirocket missiles

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For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.

True

False

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In the field controlled motor the entire damping comes from

Armature resistance

Field resistance

Back emf

Motor friction and load

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DC tachogenerator can be used in

Position control system

Neither A nor B

Both A and B

Speed control system

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Integral control action

Removes offset

Both (a) and (b)

Neither (a) nor (b)

May lead to oscillatory response

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Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator

1 and 2

3 and 4

All

1, 2 and 3

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A lead compensator

Increases the stability margin and speeds up the transient-response.

Increases the stability margin

None of these

Speeds up the transient response

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If the poles lie in second quadrant, damping ratio is

1

more than 1

zero

less than 1

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A lag compensator

Improves steady state behavior and speeds up the transient response of the system

Speeds up the transient response of the system

Improves steady state behavior of the system

Improves steady state behavior and preserves the transient response of the system

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