How do closed-loop capstan drive tape transports overcome the disadvantages of the open-loop drive design?

How do closed-loop capstan drive tape transports  overcome the disadvantages of the open-loop drive design?
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1 Answer

Answer :

Closed loop capstan drive transports use more than one capstan  to clamp the tape in the area around the magnetic head.
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There are two types of tape transport configurations, open loop capstan drive and closed-loop capstan drive. What are two major disadvantages of open-loop capstan drive tape transports?

Description : There are two types of tape transport configurations, open loop capstan drive and closed-loop capstan drive. What are two major disadvantages of open-loop capstan drive tape transports?

Last Answer : a. Only operates in one direction. b. The tape tension and head-to-tape contact can vary.

What are the three most common closed-loop capstan drive designs?

Description : What are the three most common closed-loop capstan drive designs?

Last Answer : a. Differential velocity capstans. b. Dual motors dual capstans. c. Peripheral drive capstans.

How do dual-motor dual capstan drives maintain a constant tape tension while operating in either a forward or reverse direction?

Description : How do dual-motor dual capstan drives maintain a constant tape tension while operating in either a forward or reverse direction?

Last Answer : Each capstan is driven by its own motor. It maintains tape tension by slowing down one of the motors. When the tape motion is reversed, the opposite motor is slowed down.

. How do tape transports with differential velocity capstans maintain a constant tape tension in the area around the magnetic heads?

Description : . How do tape transports with differential velocity capstans maintain a constant tape tension in the area around the magnetic heads?

Last Answer : The supply capstan is slightly larger than the take-up capstan. This causes the take-up capstan to pull the tape slightly faster than the supply capstan feeds the tape.

Closed loop and Open loop Control System Advantages and Disadvantages

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Description : Hard disk drive transports contain the electromechanical parts that perform what three functions?

Last Answer : a. Rotates the hard disk platters. b. Writes data to and reads data from the disk platters

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

Last Answer : Feedback.

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Description : select the correct response from the choices given in the parentheses. Q-20. In a closed-loop configuration the output signal is determined by (the input signal, the feedback signal, both).

Last Answer : Both the input signal and the feedback signal.

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What are two disadvantages of using a recorder’s erase head to erase data recorded on a magnetic tape?

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Last Answer : Using an erase head is slow, and it may not completely erase the tape.

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Description : What are the disadvantages of Open loop control system?

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With reference to NC machines, which of the following statements is wrong a.Both closed-loop and open-loop control systems are used b.Paper tapes, floppy tapes and cassettes are used for data storage c.Digitizers may be used as interactive input devices d.Post processor is an item of hardware

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Last Answer : c.Digitizers may be used as interactive input devices

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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. 

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

Order of the open loop transfer function is_____ to order of closed loop transfer function

Description : Order of the open loop transfer function is _____ to order of closed loop transfer function   (a) not equal (b) equal (c) less than (d) greater than 

Last Answer : Order of the open loop transfer function is equal to order of closed loop transfer function 

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

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In an open-loop control system, what action reduces the input to zero so the load is stopped at the desired position?

Description : In an open-loop control system, what action reduces the input to zero so the load is stopped at the desired position?

Last Answer : Usually the operator senses the desired load movement and reduces the input to stop the motor.

What are the two primary disadvantages of a two-wire open line?

Description : What are the two primary disadvantages of a two-wire open line?

Last Answer : High radiation losses and noise pickup.

What is Capstan or Tarot Led ?

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What is the difference between the first officer and the capstan?

Description : What is the difference between the first officer and the capstan?

Last Answer : What is the answer ?

On tank vessels with an electrically-driven capstan, the motor should be meggered periodically to test _____________. A. insulation resistance B. eddy currents C. capacitance D. armature reactance

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Last Answer : Answer: A

Theodolite is an instrument used for (a) Tightening the capstan-headed nuts of level tube (b) Measurement of horizontal angles only (c) Measurement of vertical angles only (d) Measurement of both horizontal and vertical angles*

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Last Answer : (d) Measurement of both horizontal and vertical angles*

What are the terms used to describe an open or closed telegraph circuit?

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How is the disadvantage of the Gramme-ring armature overcome in the drum-wound armature?

Description : How is the disadvantage of the Gramme-ring armature overcome in the drum-wound armature?

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Would this not be a good example of a closed loop paradox?

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A current l flows through a closed loop as shown in figure .The magnetic field at the centre O is

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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

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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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When the work done in moving a particle round a closed loop in a field is zero, the forces in the field are called A. Zero forces B. Non-Conservative forces C. Conservative forces D. Viscous forces

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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

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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. 

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With respect to a loop in the transportation table, which one of the following is not correct? (1) Every loop has an odd no. of cells and at least 5. (2) Closed loops may or may not b square in shape. (3) All the cells in the loop that have a plus or minus sign, except the starting cell, must be occupied cells. (4) Every loop has an even no. of cells and at least four.

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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

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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

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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.

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

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

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.

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.