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 mentioned

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 mentioned
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The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0.

Description : The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

Last Answer : The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

Two AC generators of the same capacity are operating in parallel. One with a zero speed droop setting and the other with a 5% speed droop. If its capacity is not exceeded, the unit whose governor has the zero speed droop setting will _____________. A. assume the smaller share of the load B. maintain the frequency of the system C. have poor sensitivity characteristics D. have poor power response

Description : Two AC generators of the same capacity are operating in parallel. One with a zero speed droop setting and the other with a 5% speed droop. If its capacity is not exceeded, the unit whose ... B. maintain the frequency of the system C. have poor sensitivity characteristics D. have poor power response

Last Answer : Answer: B

In closed loop control system, with positive value of feedback gain the overall gain of the system will

Description : In closed loop control system, with positive value of feedback gain the overall gain of the system will

Last Answer : In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease.

For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

Description : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

Last Answer : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to inverse of feedback factor

In the ideal closed loop operational amplifier, the gain depends on

Description : In the ideal closed loop operational amplifier, the gain depends on (A) value of the series component (B) value of the feedback component (C) on the operational amplifier itself (D) both A and B

Last Answer : In the ideal closed loop operational amplifier, the gain depends on (A) value of the series component (B) value of the feedback component (C) on the operational amplifier itself (D) both A and B

After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be

Description : After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be determined from which of the following criterion ? (A) Magnitude criterion alone (B) Angle criterion alone (C) Both Magnitude and Angle criteria (D) Angle of departure and angle of arrival.

Last Answer : After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be determined from which of the following criterion ? (A) Magnitude criterion alone (B) Angle ... (C) Both Magnitude and Angle criteria (D) Angle of departure and angle of arrival.

An OP amp has an open loop gain of 1,00,000. If the feedback fraction is 0.02, the approximate closed loop...

Description : An OP amp has an open loop gain of 1,00,000. If the feedback fraction is 0.02, the approximate closed loop gain is (a) 1 (b) 1,00,000 (c) 50 (d) 0.02

Last Answer : The closed loop gain Ag = G/(1+G*f) Where G is the open loop gain and f is the feedback fraction  So Ag = 49.975

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -

Description : The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -  a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the ... inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

Last Answer : The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : - is depending upon the fact whether the input is connected to inverting or non -inverting terminal

The closed-loop voltage gain of an inverting amplifier equal to

Last Answer : The closed-loop voltage gain of an inverting amplifier equal to The feedback resistance divided by the input resistance.

A non inverting closed loop op amp circuit generally has a gain factor

Last Answer : A non inverting closed loop op amp circuit generally has a gain factor Greater than one.

What basic requirement of a closed-loop system (not present in open-loops) enables present load position to be sensed?

Description : What basic requirement of a closed-loop system (not present in open-loops) enables present load position to be sensed?

Last Answer : Feedback.

n project financing ,sensitivity analysis is applied because a) almost all the cash flow methods involve uncertainty b) of the need to assess how sensitive the project to changes in input parameters c) what if one or more factors are different from what is predicted d) all the above situation

Description : n project financing ,sensitivity analysis is applied because a) almost all the cash flow methods involve uncertainty b) of the need to assess how sensitive the project to changes in input parameters c) what if one or more factors are different from what is predicted d) all the above situation

Last Answer : d) all the above situation

With respect to factors that affect reorganization, when a single change triggers off a sequence of related changes, it is called the (a) Halo effect ; (b) Hawthorne effect ; (c) Domino effect ; (d) Sensitivity effect

Description : With respect to factors that affect reorganization, when a single change triggers off a sequence of related changes, it is called the (a) Halo effect ; (b) Hawthorne effect ; (c) Domino effect ; (d) Sensitivity effect

Last Answer :  (c) Domino effect ;

Which of the following statements is correct for any closed loop system ? (a) All the co-efficients can have zero value (6) 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

Description : Which of the following statements is correct for any closed loop system ? (a) All the co-efficients can have zero value (6) 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

Last Answer : Ans: C

Closed loop and Open loop Control System Advantages and Disadvantages

Description : Closed loop and Open loop Control System Advantages and Disadvantages

Last Answer : Open Loop Control System: Control System in which output quantity has no effect on the input quantity is called Open Loop Control System. Open Loop Control System has no facility to correct automatically the ... in the closed loop system and more care is needed to design a stable closed loop system

The voltage output of an AC generator is accurately controlled by _____________. A. changing the sensitivity of the prime mover to large changes in voltage B. varying the reluctance of the air gap C. varying the DC exciter voltage D. shorting out part of the armature windings

Description : The voltage output of an AC generator is accurately controlled by _____________. A. changing the sensitivity of the prime mover to large changes in voltage B. varying the reluctance of the air gap C. varying the DC exciter voltage D. shorting out part of the armature windings

Last Answer : Answer: C

What is the advantage of using a closed-servo loop to control load velocity?

Description : What is the advantage of using a closed-servo loop to control load velocity?

Last Answer : The closed-servo loop can regulate load speed under changing conditions.

G(s) = (1-s)/s(s+2) then closed loop transfer function is a) Unstable b) Stable c) Marginally stable d) All

Description : G(s) = (1-s)/s(s+2) then closed loop transfer function is a) Unstable b) Stable c) Marginally stable d) All

Last Answer : Ans: Stable

The nurse assesses subtle personality changes, restlessness, irritability, and confusion in a patient who has sustained a fracture. The nurse suspects a) fat embolism syndrome. Cerebral disturbances in the patient with fat embolism syndrome include subtle personality changes, restlessness, irritability, and confusion.

Description : The nurse assesses subtle personality changes, restlessness, irritability, and confusion in a patient who has sustained a fracture. The nurse suspects a) fat embolism syndrome. Cerebral disturbances in ... severe, burning pain, local edema, hyperesthesia, muscle spasms, and vasomotor skin changes.

Last Answer : a) fat embolism syndrome. Cerebral disturbances in the patient with fat embolism syndrome include subtle personality changes, restlessness, irritability, and confusion.

In the illustrated amplifier, the RESET potentiometer A1R2 sets the stability of the control loop by changing the reset time constant. As the potentiometer is turned clockwise _________. EL-0060 A. the gain is increased B. the stability is increased by slowing the response time C. feedback is increased to the summing point at terminal 5 D. response time is increased decreasing stability

Description : In the illustrated amplifier, the RESET potentiometer A1R2 sets the stability of the control loop by changing the reset time constant. As the potentiometer is turned clockwise _________. EL-0060 A. ... is increased to the summing point at terminal 5 D. response time is increased decreasing stability

Last Answer : Answer: B

If the three-phase motor, shown in the illustrated schematic diagram, is running in the forward direction, which of the following actions must occur before the motor will reverse rotation? EL-0011 A. Normally-closed contacts '4'-'5' must open. B. Normally- open contacts '2'-'3' must close. C. 'L1' and 'L3' must be interchanged via the 'R' contacts. D. All of the above.

Description : If the three-phase motor, shown in the illustrated schematic diagram, is running in the forward direction, which of the following actions must occur before the motor will reverse rotation? EL-0011 A. Normally-closed ... 'L1' and 'L3' must be interchanged via the 'R' contacts. D. All of the above.

Last Answer : Answer: C

Refering to the illustrated schematic diagram, which of the following statements is true when the motor is running in the forward direction? EL-0011 A. Normally-open contacts '4-5' are closed. B. Current flows through the 'Reverse' push-button switch. C. Normally-closed contacts 'R' are open. D. The blowout coils must be closed.

Description : Refering to the illustrated schematic diagram, which of the following statements is true when the motor is running in the forward direction? EL-0011 A. Normally-open contacts '4-5' are closed. B. Current ... switch. C. Normally-closed contacts 'R' are open. D. The blowout coils must be closed.

Last Answer : Answer: B

The amount and Intensity of monsoon rainfall is determined by the frequency of (a) western disturbances (b) dust storms (c) cyclones (d) tropical depressions

Description : The amount and Intensity of monsoon rainfall is determined by the frequency of (a) western disturbances (b) dust storms (c) cyclones (d) tropical depressions

Last Answer : Ans: (d)

A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon

Description : A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon

Last Answer : A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not ... turns in the loop D. strength of the current

An operational amplifier, as used in today's consoles, has a calculated gain of 5. This means that when the input changes _____________. A. 5 volts, the output changes 10 volts B. 10 volts, the output changes 5 volts C. 2 volts, the output changes 10 volts D. 10 volts, the output changes 2 volts

Description : An operational amplifier, as used in today's consoles, has a calculated gain of 5. This means that when the input changes _____________. A. 5 volts, the output changes 10 volts B. 10 volts, the output changes 5 volts C. 2 volts, the output changes 10 volts D. 10 volts, the output changes 2 volts

Last Answer : Answer: C

An operational amplifier, as used in today's consoles, may have a calculated gain of 5. This means that as the input changes by ______________. A. 1 volt, the output changes 5 volts B. 5 volts, the output changes 1 volt C. 5 volts, the output changes 10 volts D. 10 volts, the output changes 5 volts

Description : An operational amplifier, as used in today's consoles, may have a calculated gain of 5. This means that as the input changes by ______________. A. 1 volt, the output changes 5 volts B. 5 volts, the output changes 1 volt C. 5 volts, the output changes 10 volts D. 10 volts, the output changes 5 volts

Last Answer : Answer: A

In which system we get feedback? a.Open-loop system b.Machine control system c.Closed-loop system d.None of the above

Description : In which system we get feedback? a.Open-loop system b.Machine control system c.Closed-loop system d.None of the above

Last Answer : c.Closed-loop system

Explain Closed loop and Open loop system with sketch.

Description : Explain Closed loop and Open loop system with sketch. 

Last Answer : Closed Loop System: [1] The name indicates that the closed loop control system has a loop that is closed as shown in figure. [2] A feedback device is used for this purpose. This makes ... system is generally used in point-to-point systems where the accuracy requirements are not critical. 

With the help of block diagram explain closed loop control CNC system.

Description : With the help of block diagram explain closed loop control CNC system. 

Last Answer : Special motors called servos are used for executing machine movements in closed loop system. The name indicates that the closed loop control system has a loop that is closed as shown in fig. ... to the drive unit and the cycle repeats until there is no error signal from the comparator.

Describe open loop and closed loop system.

Description : Describe open loop and closed loop system.

Last Answer : Open loop and closed loop system: Open system: When the input is independent of the output, the system is called open- loop system. The control action is based on only some ... system is called closed- loop control system. The output is continuously measured and fed to the input. 

Difference between open loop and closed loop control system

Description : Difference between open loop and closed loop control system

Last Answer : Difference between open loop and closed loop control system : Sr No. Open loop control system Closed loop control system  1 Feedback doesn't exists Feedback exists 2 ... and hence costly 9 Highly affected by nonlinearities Reduced effect of non-linearity

Negative feedback in a closed-loop control system DOES NOT

Description : Negative feedback in a closed-loop control system DOES NOT (A) reduce the overall gain (B) reduce bandwidth (C) improve disturbance rejection (D) reduce sensitivity to parameter variation

Last Answer : Negative feedback in a closed-loop control system DOES NOT reduce bandwidth

In a closed loop control system ...

Description : In a closed loop control system  (a) control action depends upon the output and also on the input command (b) output signal is fed back to be compared with the reference signal (c) the accuracy is better than in the open loop system (d) all of the above

Last Answer : In a closed loop control system control action depends upon the output and also on the input command , output signal is fed back to be compared with the reference signal , the accuracy is better than in the open loop system. 

If the characteristics equation of a closed loop system is s2+2s+2=0, then the system is...

Description : If the characteristics equation of a closed loop system is s2+2s+2=0, then the system is  (A) Over damped (B) Critically damped (C) Under damped (D) Undamped 

Last Answer : C. Solving the above character equation gives complex roots -1+i and -1-i. If we plot that roots on real and imaginary axis plane(s-plane), it will be completely on left side of s-plane. So, the oscillations of the above conjugate roots are underdamped and are absolutely stable.

In a closed-loop system in which the output is the speed of a motor, the output rate control can be used to_________.

Last Answer : In a closed-loop system in which the output is the speed of a motor, the output rate control can be used to limit the acceleration of the motor.

_____is a closed loop system.

Description : _____is a closed loop system.

Last Answer : Auto-pilot for an aircraft is a closed loop system.

What are some examples of a closed loop system?

Description : What are some examples of a closed loop system?

Last Answer : C.L s/m. EX. Air conditioner (AC), rocket launcher, radar system, voltage stabilizer etc.

True statement about dark adaptation include: a. there is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation b. rods are more sensitive than cone during dark adaptation c. biphasic changes only occur in retina which processes both rods and cones d. all above

Description : True statement about dark adaptation include: a. there is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation b. rods are more sensitive than cone during dark adaptation c. biphasic changes only occur in retina which processes both rods and cones d. all above

Last Answer : all above

Elasticity of demand measures the A.Sensitivity of sales to changes in a particular causal factor B.Sensitivity of production to changes in a particular cost C.Value of price and cost D.Volume of product

Description : Elasticity of demand measures the A.Sensitivity of sales to changes in a particular causal factor B.Sensitivity of production to changes in a particular cost C.Value of price and cost D.Volume of product

Last Answer : A.Sensitivity of sales to changes in a particular causal factor

If a single-phase induction motor fails to start, the problem may be _____________. A. an open in the main winding B. a shorted shunt field C. a closed centrifugal switch D. low circuit frequency

Description : If a single-phase induction motor fails to start, the problem may be _____________. A. an open in the main winding B. a shorted shunt field C. a closed centrifugal switch D. low circuit frequency

Last Answer : Answer: A

If a single-phase induction motor fails to start, the problem may be _____________. A. an open in the run winding B. a shorted shunt field C. a closed centrifugal switch D. low circuit frequency

Description : If a single-phase induction motor fails to start, the problem may be _____________. A. an open in the run winding B. a shorted shunt field C. a closed centrifugal switch D. low circuit frequency

Last Answer : Answer: A

An alternator is being paralleled with one on the line. At the INSTANT the circuit breaker is closed, the frequency of the incoming alternator will normally _____________. A. increase B. not change C. decrease D. be exactly 60 hertz

Description : An alternator is being paralleled with one on the line. At the INSTANT the circuit breaker is closed, the frequency of the incoming alternator will normally _____________. A. increase B. not change C. decrease D. be exactly 60 hertz

Last Answer : Answer: C

You are attempting to parallel two AC generators, and the synchroscope pointer is revolving fast in the clockwise direction. This indicates that the frequency of the incoming machine is _____________. A. higher than the bus frequency B. lower than the bus frequency C. the same as the bus frequency and the circuit breaker may be closed at any pointer position D. the same as the bus frequency but out of phase with it

Description : You are attempting to parallel two AC generators, and the synchroscope pointer is revolving fast in the clockwise direction. This indicates that the frequency of the incoming machine is _____________. A. higher ... at any pointer position D. the same as the bus frequency but out of phase with it

Last Answer : Answer: A

You are attempting to parallel two AC generators, and the synchroscope pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is _____________. A. higher than the bus frequency B. lower than the bus frequency C. the same as the bus frequency but out of phase with it D. the same as the bus frequency and the circuit breaker may be closed at any pointer position

Description : You are attempting to parallel two AC generators, and the synchroscope pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is _____________. A. higher ... the same as the bus frequency and the circuit breaker may be closed at any pointer position

Last Answer : Answer: A

You are attempting to parallel two AC generators and the synchroscope pointer stops at a position other than 0° prior to closing the circuit breaker. This indicates ___________. A. the frequency of the incoming machine is the same as the bus frequency B. the incoming machine is in phase with the bus, but the frequency is not the same C. the circuit breaker may be closed after breaker has been reset D. there is an existing cross current between generators

Description : You are attempting to parallel two AC generators and the synchroscope pointer stops at a position other than 0° prior to closing the circuit breaker. This indicates ___________. A. the frequency of ... be closed after breaker has been reset D. there is an existing cross current between generators

Last Answer : Answer: A

You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow direction. This indicates that the frequency of the incoming machine is _____________. A. higher than the bus frequency B. lower than the bus frequency C. the same as the bus frequency but out of phase with it D. the same as the bus frequency, and the circuit breaker may be closed at any pointer position

Description : You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow direction. This indicates that the frequency of the incoming machine is _____________. A. higher than ... same as the bus frequency, and the circuit breaker may be closed at any pointer position

Last Answer : Answer: B

What is an auto-associative network? a) a neural network that contains no loops b) a neural network that contains feedback c) a neural network that has only one loop d) a single layer feed-forward neural network with pre-processing

Description : What is an auto-associative network? a) a neural network that contains no loops b) a neural network that contains feedback c) a neural network that has only one loop d) a single layer feed-forward neural network with pre-processing

Last Answer : b) a neural network that contains feedback