Question 1

is an open loop control system.
A)Ward Leonard control
B)Field controlled D.C. motor
C)Stroboscope
D)Metadyne

Accepted Answer

B

Question 2

A control system with excessive noise, is likely to suffer from
A)saturation in amplifying stages
B)loss of gain
C)vibrations
D)oscillations

Accepted Answer

Excessive noise in a control system can lead to saturation in amplifying stages, as the noise can cause the amplifiers to reach their maximum output limits, distorting the signal.

Question 3

Zero initial condition for a system means
A)input reference signal is zero
B)zero stored energy
C)ne initial movement of moving parts
D)system is at rest and no energy is stored in any of its components

Accepted Answer

Zero initial condition means the system is at rest and no energy is stored in any of its components.

Question 4

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

Accepted Answer

The transfer function of a system represents the relationship between the input and output in the frequency domain, allowing calculation of the output for any given input.

Question 5

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

Accepted Answer

Feedback in amplifiers tends to stabilize the gain and extend the bandwidth. This means that as the gain decreases due to feedback, the bandwidth increases, compensating for the loss in gain. This is a fundamental principle in feedback amplifier design, aiming to achieve a wider frequency response while controlling the gain.

Question 6

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

Accepted Answer

The sensitivity of a closed-loop system to gain changes and load disturbances depends on several factors, including frequency, loop gain, and forward gain. These elements collectively influence how the system responds to internal and external changes, making the correct answer "All of the above."

Question 7

The transient response, with feedback system,
A)rises slowly
B)rises quickly
C)decays slowly
D)decays quickly

Accepted Answer

The answer of The transient response, with feedback system,
A)rises slowly
B)rises...

Question 8

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

Accepted Answer

The second derivative input signals modify the time constant and suppress the oscillations of the system.

Question 9

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

Accepted Answer

Only one of the static error co-efficients has a finite non-zero value.

Question 10

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

Accepted Answer

A system with a gain margin close to unity or a phase margin close to zero is highly oscillatory, indicating it is on the verge of instability. This is because a small gain margin means the system can easily become unstable with a slight increase in gain, and a small phase margin means the system's response can easily oscillate.

Question 11

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

Accepted Answer

Noise in a control system is proportional to the bandwidth. A wider bandwidth allows more noise to enter the system, potentially degrading performance.

Question 12

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

Accepted Answer

The answer of In a stable control system backlash can...

Question 13

In an automatic control system which of the following elements is not used ?
A)Error detector
B)Final control element
C)Sensor
D)Oscillator

Accepted Answer

Oscillators are not typically used in automatic control systems. Their main function is to generate repetitive signals, which doesn't align with the primary functions of control systems such as error detection, measurement, and control action execution.

Question 14

In a control system the output of the controller is given to
A)final control element
B)amplifier
C)comparator
D)sensor

Accepted Answer

The output of the controller in a control system is given to the final control element, which directly influences the process being controlled.

Question 15

A controller, essentially, is a
A)sensor
B)clipper
C)comparator
D)amplifier

Accepted Answer

A controller functions as a comparator by comparing the actual value of a system's output to a desired setpoint and making decisions to adjust the system accordingly.

Question 16

The capacitance, in force-current analogy, is analogous to
A)momentum
B)velocity
C)displacement
D)mass

Accepted Answer

In the force-current analogy, capacitance is analogous to mass. This is because capacitance (C) relates charge (Q) and voltage (V) in a similar way that mass (m) relates velocity (v) and momentum (p), with the relationship for capacitance being Q = CV and for mass being p = mv.

Question 17

The temperature, under thermal and electrical system analogy, is considered analogous to
A)voltage
B)current
C)capacitance
D)charge

Accepted Answer

In thermal and electrical system analogies, temperature is considered analogous to voltage because both represent potential differences that drive the flow of heat or electricity, respectively.

Question 18

In electrical-pneumatic system analogy the current is considered analogous to
A)velocity
B)pressure
C)air flow
D)air flow rate

Accepted Answer

The answer of In electrical-pneumatic system analogy the current is...

Question 19

In liquid level and electrical system analogy, voltage is considered analogous to
A)head
B)liquid flow
C)liquid flow rate
D)none of the above

Accepted Answer

In liquid level and electrical system analogy, voltage is analogous to head. This analogy is used because both voltage and head represent potential energy in their respective systems. Voltage in an electrical system represents the potential difference that drives the flow of electrons, while head in a liquid system represents the potential energy per unit weight of fluid due to its elevation, which drives the flow of the liquid.

Question 20

The viscous friction co-efficient, in force-voltage analogy, is analogous to
A)charge
B)resistance
C)reciprocal of inductance
D)reciprocal of conductance

Accepted Answer

In the force-voltage analogy, viscous friction coefficient is analogous to electrical resistance. This is because both represent opposition to motion or flow (mechanical motion in the case of viscous friction and electrical current in the case of resistance) and both dissipate energy in the form of heat.

Quiz 2: Control Systems and Analogy Analogies

is an open loop control system.

A control system with excessive noise, is likely to suffer from

Zero initial condition for a system means

Transfer function of a system is used to calculate which of the following ?

The band width, in a feedback amplifier.

On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?

The transient response, with feedback system,

The second derivative input signals modify which of the following ?

Which of the following statements is correct for any closed loop system ?

Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?

Due to which of the following reasons excessive bond width in control systems should be avoided ?

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

In an automatic control system which of the following elements is not used ?

In a control system the output of the controller is given to

A controller, essentially, is a

The capacitance, in force-current analogy, is analogous to

The temperature, under thermal and electrical system analogy, is considered analogous to

In electrical-pneumatic system analogy the current is considered analogous to

In liquid level and electrical system analogy, voltage is considered analogous to

The viscous friction co-efficient, in force-voltage analogy, is analogous to