Deck 4: Control System Components and Functions

Question 1

The phase lag produced by transportation relays

A)is independent of frequency
B)is inverseh'proportional to frequency
C)increases linearly with frequency
D)decreases linearly with frequency

Answer 1

increases linearly with frequency

Question 2

In a stable control system saturation can cause which of the following ?

A)Low-level oscillations
B)High-level oscillations
C)Conditional stability
D)Overdamping

Answer 2

Low-level oscillations

Question 3

Which of the following can be measured by the use of a tacho-generator ?

A)Acceleration
B)Speed
C)Speed and acceleration
D)Displacement

Answer 3

Speed

Question 4

is not a final control element.

A)Control valve
B)Potentiometer
C)Electro-pneumatic converter
D)Servomotor

Question 5

Which of the following is the definition of proportional band of a controller ?

A)The range of air output as measured variable varies from maximum to minimum
B)The range of measured variables from set value
C)The range of measured variables through which the air output chan¬ges from maximum to minimum
D)Any of the above

Question 6

Pressure error can be measured by which of the following ?

A)Differential bellows and straingauge
B)Selsyn
C)Strain gauge
D)Strain gauge and potentiometer

Question 7

Which of the following devices is used for conversion of co-ordinates ?

A)Microsyn
B)Selsyn
C)Synchro-resolver
D)Synchro-transformer

Question 8

The effect of error damping is to

A)provide larger settling lime
B)delay the response
C)reduce steady state error
D)any of the above

Question 9

technique gives quick transient and stability response

A)Root locus
B)Bode
C)Nyquist
D)Nichols

Question 10

A phase lag lead network introduces in the output

A)lag at all frequencies
B)lag at high frequencies and lead at low frequencies
C)lag at low frequencies and lead at high frequencies
D)none of the above

Question 11

Which of the following is the non-linearity caused by servomotor ?

A)Static friction
B)Backlash
C)Saturation
D)None of the above

Question 12

can be extended to systems which are time-varying ?

A)Bode-Nyquist stability methods
B)Transfer functions
C)Root locus design
D)State model representatives

Question 13

When the initial conditions of a system are specified to be zero it implies that the system is

A)at rest without any energy stored in it
B)working normally with reference input
C)working normally with zero reference input
D)at rest but stores energy

Question 14

A differentiator is usually not a part of a control system because it

A)reduces damping
B)reduces the gain margin
C)increases input noise
D)increases error

Question 15

In a control system integral error compensation _______ steady state error

A)increases
B)minimizes
C)does not have any effect on
D)any of the above

Question 16

Which of the following can be measured byLVDT?

A)Displacement
B)Velocity
C)Acceleration
D)Any of the above

Question 17

directly converts temperature into voltage.

A)Thermocouple
B)Potentiometer
C)Gear train
D)LVDT

Question 18

The transfer function technique is considered as inadequate under which of the following conditions ?

A)Systems having complexities and non-linearities
B)Systems having stability problems
C)Systems having multiple input dis¬turbances
D)All of the above

Question 19

Which of the following is the output of a thermocouple ?

A)Alternating current
B)Direct current
C)A.C. voltage
D)D.C. voltage

Question 20

A.C. servomotor is basically a

A)universal motor
B)single phase induction motor
C)two phase induction motor
D)three phase induction motor

Question 21

The first order control system, which is well designed, has a

A)small bandwidth
B)negative time constant
C)large negative transfer function pole
D)none of the above