Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 30, Problem 13R
(a)
To determine
Mention whether the statement “receptacles installed from the edge of hot tub or spa should be within 5 ft” is true or false.
(b)
To determine
Mention whether the statement “receptacles installed within 10 ft (3 m) from the hot tub or spa should be protected by GFCI” is true or false.
(c)
To determine
Mention whether the statement “receptacles providing power to the equipment of pool should be GFCI protected” is true or false.
(d)
To determine
Mention whether the statement “wall switches should be installed within 5 ft (1.5 m) from the swimming pool” is true or false.
(e)
To determine
Mention whether the statement “luminaires installed above a spa should be less at least 7 ft 6 in. when the circuit is GFCI protected” is true or false.
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In this experiment, we are going to use a 2N3904 BJT. Examine the data sheet for this device
carefully. In particular, make a note of the current gain (identified by hFE).
1. Obtain the curve trace for a "Darlington Pair" of Bipolar Junction Transistors. A Darlington
Pair consists of two transistors with the first BJT driving the base terminal of the second
transistor as shown in Figure 1 below.
A. Set up the primary sweep voltages for V1 the same as shown in the lecture notes (see
the Darlington pair IV curve).
B. Set up the secondary sweep currents for 11 to be an order of magnitude smaller than
for the single BJT. In the Sweep Type box choose linear and enter the following 3
values: Start Value: 0, End Value: 8u and Increment: 1u (see lecture notes).
C. Describe the primary differences you observe between the single BJT Curve Trace and
that of the Darlington Pair. Discuss what might cause each difference.
Q1
11
Q2
V1
Q2N3904
Figure 1. A Darlington Pair of 2N3904 transistors in a…
2. Using the IV plots shown in Fig. 3 (and found in the reintroduction to PSpice) design a BJT
biasing circuit that results in the following parameters: VCE = 2 Vand ig = 40 μA. We
also require the power supply to be fixed at 5 Volts (this is where the load line intercepts
the iB =ic = 0 line). You may use the circuit shown in Example 1. Note that all resistor
values in Example 1 must be recalculated. Your solution for the base to ground and base
to collector resistors may not be unique.
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- b) A semiconductor is doped with an impurity concentration N such that N >> n; and all the impurities are ionized. Also, n = N and p = n2/N. Is the impurity a donor or an acceptor? Explain.arrow_forwardd) For a silicon sample maintained at T=300K, the Fermi level is located 0.259 eV above the intrinsic Fermi level. What are the hole and electron concentrations?arrow_forwarde) In a nondegenerate germanium sample maintained under equilibrium conditions near room temperature, it is known that n=10¹³/cm³, n = 2p, and NA 0. Determine n and ND.arrow_forward
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- 5. Represent the following system in state-space form. Write A, B, C and D clearly in your answer. d³y d²y dt3 - +5y=2u dt²arrow_forward3. Find the transfer function H(s) and frequency response H (w) of the following system whose differential equation is given by d¹y d³y +3. dy +5 dt4 dt3 dt - d²u du 4y = - 5 dt² dtarrow_forward1. Consider a plant that you want to control. The input u(t) and output y(t) of the plant are related by y(t) = 7 u(t) + w(t) where w(t) is an additive disturbance at the output which is bounded by -0.5 w(t) ≤0.5 for all time t. You want to build a controller so that the output follows a constant reference signal r(t) = where -15 ≤≤ 15. You will consider both open-loop and closed-loop for this problem. a) Sketch the block diagram of the plant. b) Please build an open-loop controller that sets the output to 7, assuming the disturbance is ignored. Please show your controller both as an equation and a block diagram. c) Say that you use the open-loop controller in part b, but now the disturbance w(t) is present. What is the maximum possible magnitude of error in the output for the reference signal? Suppose you have designed a feedback control for the plant where the controller has the form u(t) = K(r(t) − y(t)). Here K is the gain constant of the controller that you will design. d) Please…arrow_forward
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