The most commonly used gadget that you should know of is a ding-dong doorbell using an electromagnet. In order to make a door bell, please answer the following questions:

1. List the items needed to make a door bell using common household stuff.
2. Draw its labeled schematics, and explain its working principle
3. Which Maxwell’s equation will you use to design the doorbell actuation
4. Describe two ways to make the bell sound loud.
5. List five commercial uses of electromagnets other than doorbell.

81. Given: Service drop conductors passing over a swimming pool have a vertical clearance from the water surface of 18 ft. these conductors must be located a minimum of _____ ft. horizontally from the outer edge of the swimming pool.

A. 0

B. 10

C. 15

D. 22.5

82. What is the full load current in amperes for a 1-hp single-phase, 115-volt, AC motor?

A. 2.1

B. 8

C. 8.4

D. 16

83. If a branch circuit supplies a single 14-ampere non-motor-operated appliance without an over current protection rating, the rating of the over current protection shall not exceed _____ percent of the appliance rated current.

A. 90

B. 100

C. 125

D. 150

84. What is the maximum overcurrent protection rate in amperes permitted for an appliance without a motor that has an input rating of 40 amperes?

A. 30

B. 40

C. 50

D. 60

85. The overload protection for a 3-phase, 25 Hp, 480-volt motor shall be selected

A. from the motor nameplate full load current

B. from the full load current in table 430-150 of the NEC

C. from the locked-rotor current in table 430-150 of the NEC

D. as a percentage of the motor branch-circuit overcurrent protection

86. Branch-circuit conductors that serve a 3-phase, 230-volt, 15 ph induction-type motor shall have an allowance ampacity of at least _____ amperes.

A. 42

B. 46.2

C. 52. 5

D. 60.5

87. Disregarding exceptions, where the design and operation of a generator does not prevent overloading the ampacity of the undergrounded phase conductors shall be at least ______ percent of the name plate current rating of the generator.

A. 80

B. 100

C. 115

D. 125

88. A circuit that supplies a 1/2 -hp motor that operates utilization equipment fastened in place in conjunction with other loads shall be calculated by adding the sum of the other loads plus _____ percent of the largest motor.

A. 100

B. 125

C. 150

D. 175

89. When the design and operation of the generator will prevent overloading the conductors shall not be less than ______>

A. the same hp as the generator

B. 100 percent of nameplate current

C. 115 percent of nameplate current

D. 115 percent of the hp of the generator

90. Transformers for sight located in an attic or soffit shall have a permanent walkway of at least _____ in. wide.

A. 12

B. 18

C. 24

D. 36

Specify the aliasing frequency of a signal that has a maximum frequency of 92kHz and a sample frequency of 130kHz. Is this an optimal sampling frequency? If so, explain why? If not, propose an optimal sampling frequency.

Describe in details three practical applications for magnetostatic.

I need to develop a VHDL code for a FPGA basys 3, 4 digit 7 segment display. So when binary 0, 1 ,and 2 are inputted the display says bad. When binary 3,4,5,6, the display says good.

Explain why several semiconductor materials might be put together to obtain more
efficient solar cells.

Define well with Diagrams
How Oscillator and Phase-shift Oscillator can be constructed, is it possible to adjust the oscillator frequency? If yes! Then explain how oscillator frequency can be adjusted.

Question related to differential equations course....

Use method of un determinate coefficients

5) Explain what is the following:

1.- PWM modulation.

2.- SPWM modulation with third harmonic.

3.- Operation in over modulation and six-step.

Implement the following function using a binary decoder and as few NAND gates as possible.

F= A’B’C’D’ + A’B’C D’ + A’BCD’ + AB’CD’ + ABC’D’ + ABCD’

a) Draw the truth table for the function. (8 Pts)

b) Implement the function using only one 74x138 decoder and as few NAND gates as possible. Clearly name all the signals in accordance with the documentation standards. (12 Pts)

b) Implement the function using only one 74x138 decoder and as few NAND gates as possible. Clearly name all the signals in accordance with the documentation standards. (12 Pts)

Use a 5 nF capacitor to design a series RLC bandpass filter, as shown at the top of Fig. 14.27.The center frequency of the filter is 8 kHz, and the quality factor is 2.

a) Specify the values of R and L.using pspice

b) What is the lower cutoff frequency in kilohertz? using pspice

c) What is the upper cutoff frequency in kilohertz?using pspice

d) What is the bandwidth of the filter in kilohertz?using pspice

14.3.4 - What signal is sent in period 9 if a slave on the I2C bus has the same slave address as was sent by the master in periods 1 to 7?

Question 4 options:

14.3.6 - What field is sent in period 8 of an I2C message?

Question 5 options:

Assume that the registers have the following values (all in hex) and that CS= 1000, DS = 2000,
SS=3000, SI=4000, DI = 5000, BX=6080, BP= 7000, AX=25FF, CX=8791, and DX=1299. Calculate
the physical address of the memory where the operand is stored and the contents of the memory
locations in each of the addressing examples.
a) MOV [SI], AL
b) MOV [SI+BX+8], AH
c) MOV [BX]+300, DX
Now Examine the status of the CF, PF, AF, ZF, and SF if we execute the following statement after
first statement stated above. (N is equal to Last three digits of your roll number, convert to hex, show
binary equivalent of N and show all the carries generated at each stage of addition)
d) MOV [SI], AL
ADD [SI], N