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

Accepted Answer

The phase lag produced by transportation relays increases linearly with frequency because the delay time remains constant while the frequency increases, leading to a greater phase shift.

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

Accepted Answer

A

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

Accepted Answer

A tacho-generator is specifically designed to measure the speed of a rotating object, not acceleration or displacement.

Question 4

is not a final control element.
A)Control valve
B)Potentiometer
C)Electro-pneumatic converter
D)Servomotor

Accepted Answer

A final control element directly affects the process variable. A potentiometer, however, is a type of sensor or transducer; it is not used to directly control a process but to measure or adjust electrical resistance within a circuit. Control valves, electro-pneumatic converters, and servomotors are examples of devices that can directly control a process by adjusting flow, pressure, or mechanical movement.

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

Accepted Answer

The proportional band of a controller is defined as the range of the measured variable through which the controller's output changes from its minimum to its maximum. This means as the input (measured variable) moves through this range, the output of the controller will cover its entire span from the lowest possible output to the highest.

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

Accepted Answer

The answer of Pressure error can be measured by which...

Question 7

Which of the following devices is used for conversion of co-ordinates ?
A)Microsyn
B)Selsyn
C)Synchro-resolver
D)Synchro-transformer

Accepted Answer

Synchro-resolvers are used for the conversion of coordinates, specifically for converting angular position or motion into an electrical signal, which can be interpreted in terms of coordinate data. They are widely used in various applications, including aerospace and robotics, for precise control and measurement of angular positions.

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

Accepted Answer

Error damping is primarily aimed at reducing the steady state error in control systems, making the system more accurate in tracking its desired output.

Question 9

technique gives quick transient and stability response
A)Root locus
B)Bode
C)Nyquist
D)Nichols

Accepted Answer

Root locus technique is used to design control systems to achieve desired transient and stability response by providing a graphical method to analyze and design the system's poles and zeros.

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

Accepted Answer

A phase lag lead network introduces a phase lag at low frequencies and a phase lead at high frequencies. This is due to the frequency-dependent phase shift introduced by the network's components, typically resistors and capacitors.

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

Accepted Answer

Saturation in a servomotor refers to the condition where an increase in input signal does not result in an increase in output, indicating a nonlinear behavior. This is due to the motor reaching its maximum capacity or limit.

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

Accepted Answer

State model representatives can be extended to time-varying systems as they can represent dynamic systems with time-dependent parameters, unlike the other methods which are typically used for time-invariant systems.

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

Accepted Answer

The answer of When the initial conditions of a system...

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

Accepted Answer

Differentiators amplify high-frequency noise present in the input signal, which can lead to instability and erratic behavior in control systems.

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

Accepted Answer

Integral error compensation is used in control systems to minimize steady-state error by integrating the error over time, which helps in achieving zero steady-state error for certain types of inputs, such as step inputs.

Question 16

Which of the following can be measured byLVDT?
A)Displacement
B)Velocity
C)Acceleration
D)Any of the above

Accepted Answer

LVDT (Linear Variable Differential Transformer) is a transducer that converts linear displacement into an electrical signal. It can measure displacement, velocity, and acceleration.

Question 17

directly converts temperature into voltage.
A)Thermocouple
B)Potentiometer
C)Gear train
D)LVDT

Accepted Answer

A thermocouple directly converts temperature differences into a voltage. It works based on the Seebeck effect, where a voltage, the thermoelectric voltage, is generated if there is a temperature difference between two different types of metal joined together at two junctions.

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

Accepted Answer

The transfer function technique is inadequate for systems with complexities and non-linearities, stability problems, and multiple input disturbances because it is primarily designed for linear, time-invariant systems and may not effectively handle these conditions.

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

Accepted Answer

A thermocouple produces a D.C. voltage that is proportional to the temperature difference between its two junctions.

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

Accepted Answer

A.C. servomotors are typically two-phase induction motors, which are used for precise control of angular position, velocity, and acceleration.

Quiz 4: Control System Components and Functions

The phase lag produced by transportation relays

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

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

is not a final control element.

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

Pressure error can be measured by which of the following ?

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

The effect of error damping is to

technique gives quick transient and stability response

A phase lag lead network introduces in the output

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

can be extended to systems which are time-varying ?

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

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

In a control system integral error compensation _______ steady state error

Which of the following can be measured byLVDT?

directly converts temperature into voltage.

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

Which of the following is the output of a thermocouple ?

A.C. servomotor is basically a