Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
1. In the system shown schematically below, water is supplied to a spray nozzle by a gear pump with a constant output of 20 US gpm. The flow rate of water discharged through the nozzle is controlled by manipulating the flow of water re-circulated around the pump using a proportional-plus-integral controller. The set point of the controller is normally 14 US gpm but can vary between 9 and 18 US gpm. The flow sensor has a range of 0-20 US gpm and responds instantaneously to flow variations. The control valve has a CV of 3 US gpm/psi1/2, a time constant of 2 seconds, a linear installed characteristic and is current-to-close.
(a) What should be the action of She controller (reverse or direct)? Why?
(b) Would it be better to eliminate the recirculation loop and install the control valve immediately downstream of the pump? Why?
(c) If the pump discharge pressure is 100 psig when the control valve is closed, show that the flow rate across the nozzle is 8 US gpm when the control valve is wide open,
Notes: The valve and nozzle are the only significant flow resistances in this system. You may also assume that the pump suction port and the spray leaving the nozzle are at atmospheric pressure. The nozzle behaves as an orifice.
(d) What are the outputs of the controller and flow transmitter (in %) when the set point is 12 US gpm and steady-state has been achieved?
Properties of filament and contact materials. The Filament materials must have low resistance temperature co-efficient, high melting point, high mechanical strength, ductility
What are the main sources of electrical resistance in a metal? The factors that affect the electrical resistance of a metal are impurity, temperature and alloying. The free mea
Permeability: The rate of diffusion of molten solid liquid and gases through refractories is called permeability. Low permeability is usually more important than low porosity from
Explain with suitable diagrams the atomic model of diffusion. Atomic Model of Diffusion Diffusion happens as a result of repeated jumps of atoms from their sites to other ne
performance equation
Emulsification: Emulsification can be defined as the property of oils to get intimately mixed with water easily. Emulsions can be oil in water emulsion or water in oil emulsion. C
can you help with process control questions
1. a) How are Polymers classified? b) Define polymerization. Differentiate addition and condensation polymerization. 2. a) Explain the free radical mechanism of addition p
Different types of breakdown: (i) Intrinsic breakdown ] (ii) Thermal breakdown (iii)Defect breakdown
write a notes on priming and foaming
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd