Answer / alok0207ac@gmail.com

The advantage of PID controller is its feasibility and easy to be implemented. The PID gains can be designed based upon the system parameters if they can be achieved or estimated precisely. Moreover, the PID gain can be designed just based on the system tracking error and treats the system to be "blackbox" if the system parameters are unknown. However, PID controller generally has to balance all three-gains impact to the whole system and may compromise the transient response, such as settling time, overshoots, oscillations. If the system parameters can not be precisely estimated or achieved, the designed PID gains may not resist the uncertainties and disturbances, and thus present low robustness. Even though the PID gains can be well-designed, the PID controller still has low robust ability compared with the robust controller when the system encounters to multiple challenges from the operating environment of the system, such as temperature, weather, power surge, and so on.

Answer / alok0207ac@gmail.com

Generally, PID control algorithms, using in PLC controllers withmany anolog inputs and outputs, enable control of many control loops. It is a great advantage. In my opinion the only disadvantage it is usually related to the tuning methodology. It is connected with the brand of the PLC and its type e.g. nano, micro etc. Sometimes an autotuning procedure doesn't exist e.g. VersaMax Micro from GE and then sometimes a manual tuning process is difficult.

What is the thermal efficiency of a diesel engine?

1 Answers   ABC Inc, RRB, Siemens,

---

What is the difference between first angle and third angle

1 Answers   Ultra Engineers,

---

What is non-destructive test and what is the purpose of it?

1 Answers   RRB,

---

Why the work per kg of air flow in axial flow compressor is less compared to centrifugal compressor for same pressure ratio ?

0 Answers  

---

If an ID Fan is designed for a suction pressure of - 250 mm wg and discharge pressure of +150 mm wg, and it is installed in a system where the required system resistance at suction is only -50 mm wg, will the ID Fan be able to produce a discharge pressure of +350 mm wg?

1 Answers  

---

what is routh,s law in thermal engineering ?

0 Answers   TATA,

---

2. Dry saturated steam at 3.5 bar is expanded through a convergent nozzle to 2.2 bar. The exit area is 5 sq. cm. Calculate the exit velocity and mass flow rate, assuming isentropic expansion and super saturated flow. b) A cast iron cylinder head is fastened to a cylinder of 750mm bore with 12 stud bolts. The maximum pressure inside the cylinder is 3 Mpa. The stiffness of part is thrice the stiffness of the bolt. What should be the initial tightening load so that the point is leak proof at maximum pressure? Also choose a suitable bolt for the above application 2 The propeller shaft of a marine engine is to transmit 600 kW at 1200 rpm, without a significant bending. The efficiency of the propeller is 88% at 32 knots ( 1 knot = 1085 km/hr). If the slenderness ratio is less than 50 and the permissible shear stress should not exceed 65 Mpa. Determine the diameter of shaft. 3 A semi-elliptic leaf spring consists of two extra full-length leaves and six graduated length leaves, including the master leaf. Each leaf is 7.2 mm thick and 65 mm wide. The centre-to-centre distance between the two eyes is 1.3m. The leaves are pre-stressed in such a way that when the load is maximum, stress induced in all leaves are equal to 380 N/mm sq. Determine the maximum force that the spring can withstand

0 Answers  

---

send me jindal tech round papers

0 Answers  

---

HOW TO CALCULTE THE TR CAPACITY FOR SCREW COMPRESSOR, RECIPROCATING COMPRESSOR,PHE & COOLING TOWER? HOW TO CALCULATE THE FLOW RATING OF PUMPS?

0 Answers   Sanmar,

---

What is meant by newtonion and non-newtonion fluids?

0 Answers  

---

Which of the following pairs is correct ?

0 Answers   RRB,

---

what is the reason of hat and work is not conserved energy?

0 Answers  

---