Electrical Wiring: Residental - With Plans (Paperback) Package
18th Edition
ISBN: 9781305416376
Author: MULLIN
Publisher: Cengage
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Chapter 19.2, Problem 10R
Approximately how long would it take to produce serious burns to an adult with 140°F (60°C) water? ________________
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Students have asked these similar questions
Q4.
a) A purely derivative controller (i.e. with a zero at the origin only) is defined
by an improper transfer function. Considering its asymptotic behaviour,
explain why a purely derivative controller is difficult to implement in
practice. Relate your explanation to the potential limitations on system
performance.
b) Discuss the potential issues faced by a control system with a large cut-off
frequency. Relate your discussion to the implications on system
performance.
c)
The transfer function of a lag compensator is given by
2
KPID(S) = 2.2++0.2s
S
By using the asymptotic approximation technique:
(i) Obtain the standard form and corner frequency for each individual
component of KPID(S).
(ii) Clearly describe the asymptotic behaviour of each individual
component of KPID(S).
Module Code: EN2058
Q1. a) List the advantages and disadvantages of a closed loop system compared to
an open loop system.
b)
c)
What is the procedure for designing a control system for a bread toaster?
An RC circuit is given in Figure Q1. vi(t) and v(t) are the input and output
voltages.
(i) Derive the transfer function of the circuit.
(ii) With a unit step change vi(t) applied to the circuit, derive and sketch the
time response of the circuit.
R1 R2
v₁(t)
R3 C1
vo(t)
R₁ =R2 = 10 k
R3 = 100 kn C₁ = 100 μF
Figure Q1. RC circuit.
(iii) Assuming zero initial conditions, obtain the impulse and ramp responses
of the circuit from the step response derived in (ii). Sketching is not
needed.
Q3.
a)
The frequency response method enables the study of the steady-state
response of a system G(s). What type of inputs are used for frequency
response? If the system is linear and stable, how does the output differ
from the input? Compare the main characteristics of two types frequency
response plots.
b) Consider the control system shown in Figure Q3.
Controller
E(s)
R(s)
Desired
output
C(s)
Plant
G(s)
Y(s)
Actual
output
3(s + 3)
C(s) = k
G(s) =
= s(s - 1)(s + 10)
Figure Q3. Closed-loop system.
(i) Considering definitions in the study of bounded-input bounded-output
stability, is G(s) stable? Classify the poles and zeros of G(s).
(ii) G(s) defined in Figure Q3 is a system completely characterised by
its transfer function. Explain why this is the case.
(iii) Obtain the closed-loop transfer function P(s) = Y(s)/R(s) of the
system.
(iv) Based on your result for the previous question [Question 3b)-(iii)], use
the Routh-Hurwitz stability criterion to determine suitable values of
gain K…
Chapter 19 Solutions
Electrical Wiring: Residental - With Plans (Paperback) Package
Ch. 19.1 - Does a jet pump have any electrical moving parts...Ch. 19.1 - Prob. 2RCh. 19.1 - Where is the jet of the pump located?...Ch. 19.1 - Prob. 4RCh. 19.1 - Prob. 5RCh. 19.1 - Prob. 6RCh. 19.1 - Prob. 7RCh. 19.1 - What is compressed in the water storage tank?...Ch. 19.1 - Explain the difference between a 2-wire...Ch. 19.1 - Prob. 10R
Ch. 19.1 - Why is a 240-volt motor preferable to a 120-volt...Ch. 19.1 - How many amperes does a 1-horsepower, 240-volt,...Ch. 19.1 - What size are the conductors used for this branch...Ch. 19.1 - Prob. 14RCh. 19.1 - What provides the running overload protection for...Ch. 19.1 - What is the maximum ampere setting permitted for...Ch. 19.1 - Prob. 17RCh. 19.1 - Because the controller contains the motor starting...Ch. 19.1 - Prob. 19RCh. 19.1 - Proper pressure of the submersible pump system is...Ch. 19.1 - Fill in the data for a 16-ampere electric motor,...Ch. 19.1 - The NEC is very specific in its requirement that...Ch. 19.1 - Does the NEC allow submersible pump cable to be...Ch. 19.1 - Must the disconnect switch for a submersible pump...Ch. 19.1 - A metal well casing (shall) (shall not) be bonded...Ch. 19.2 - Prob. 1RCh. 19.2 - A major hazard involved with water heaters is that...Ch. 19.2 - Prob. 3RCh. 19.2 - The heating elements in electric water heaters are...Ch. 19.2 - An 80-gallon electric water heater is energized...Ch. 19.2 - Prob. 6RCh. 19.2 - For residential water heaters, the Consumer...Ch. 19.2 - An 80-gallon electric water heater has 60F...Ch. 19.2 - Approximately how long would it take to produce...Ch. 19.2 - Two thermostats are generally used in an electric...Ch. 19.2 - a. How many heating elements are provided in the...Ch. 19.2 - When does the lower heating element operate?...Ch. 19.2 - Prob. 14RCh. 19.2 - Prob. 15RCh. 19.2 - Prob. 16RCh. 19.2 - a. If both elements of the water heater in this...Ch. 19.2 - a. How much power in watts would the two elements...Ch. 19.2 - A condominium owner complains of not getting...Ch. 19.2 - For a single, nonmotor-operated electrical...Ch. 19.2 - A 7000-watt resistance-type heating appliance is...Ch. 19.2 - Prob. 22R
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