Electrical Engineering: Principles and Applications 6th. Edition by Hambley, Allan R | 9789332563308 | 9332563306 | Holooly

Basic Electrical

Electrical Engineering: Principles and Applications

160 SOLVED PROBLEMS

Question: 8.4

Assume that the content of register A is a signed two’s-complement number n. Using the instructions of Table 8.1, write a subroutine called SGN that replaces the content of A with +1 (in signed two’s-complement form) if n is positive, replaces it with −1 if n is negative, and does not change ...

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First, the number is tested. If it is zero, the Z ...

Question: 8.3

Manually determine the machine code for each memory location produced by the source code of Example 8.2.What is the value of the label PLUS? (Hint: Use Table 8.1 to determine the op codes for each instruction.) ...

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The assembler ignores the title and other comments...

Question: 8.2

Write the source code for a program starting in location $0300 that loads register A with the signed two’s-complement number in location $0200, computes its absolute value, returns the result to location $0200, clears the A register, and then stops. Use the instructions listed in Table 8.1. ...

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Recall that branch instructions (also known as con...

Question: 8.1

Suppose that we want a program starting in memory location 0400 that retrieves the number stored in location 0500, adds 5 to the number, writes the result to location 0500, and then stops. (We will use only the instructions listed in Table 8.1, even though the CPU12 has many additional ...

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Comments have been included to explain the purpose...

Question: 17.4

A 480-V-rms 200-hp 60-Hz eight-pole delta-connected synchronous motor operates with a developed power (including losses) of 50 hp and a power factor of 90 percent leading. The synchronous reactance is Xs = 1.4 Ω. a. Find the speed and developed torque. b. Determine the values of Ia, Er , and the ...

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a. The speed of the machine is given by Equation 1...

Question: 17.2

Calculate the starting line current and torque for the motor of Example 17.1. ...

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For starting from a standstill, we have s = 1. The...

Question: 17.1

A certain 30-hp four-pole 440-V-rms 60-Hz three-phase delta-connected induction motor has Rs = 1.2 Ω R′r = 0.6 Ω Xs = 2.0 Ω X′r = 0.8 Ω Xm = 50 Ω Under load, the machine operates at 1746 rpm and has rotational losses of 900 W. Find the power factor, the line current, the output power, copper ...

Verified Answer:

From Table 17.1, we find that synchronous speed fo...

Question: 16.4

A 50-hp shunt-connected dc motor has the magnetization curve shown in Figure 16.19. The dc supply voltage is VT = 240 V, the armature resistance is RA = 0.065 Ω, the field resistance is RF = 10 Ω, and the adjustable resistance is Radj = 14 Ω. At a speed of 1200 rpm, the rotational loss is Prot = ...

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The equivalent circuit is shown in Figure 16.20.Th...

Question: 16.3

The machine having the magnetization curve shown in Figure 16.15 is operating as a motor at a speed of 800 rpm with IA = 30 A and IF = 2.5 A. The armature resistance is 0.3 Ω and the field resistance is RF = 50 Ω. Find the voltage VF applied to the field circuit, the voltage VT applied to the ...

Verified Answer:

Equation 16.14 allows us to find the voltage for t...

Question: 15.10

Consider the source, transformer, and load shown in Figure 15.24. Determine the rms values of the currents and voltages: a. with the switch open; b. with the switch closed. ...

Verified Answer:

Because of the applied source, the primary voltage...

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