Hughes Electrical and Electronic Technology 11th. Edition by Edward Hughes | 9780273755104 | 0273755102 | Holooly

Electronics and Electrical

Hughes Electrical and Electronic Technology

302 SOLVED PROBLEMS

Question: 25.11

Divide 6310 by 910 by means of binary numbers. ...

Verified Answer:

63_{10} = 111111_2

9_{10} = ...

Question: 25.12

Divide 6110 by 910 by means of binary numbers. ...

Verified Answer:

61_{10} = 111101_2

9_{10} = ...

Question: 25.14

Determine the 2’s complement of 1101100 directly. ...

Verified Answer:

Split the number to the left of the lowest 1. [lat...

Question: 26.13

Given the function F = (A + B) · (C + D) write a Verilog module that will implement this function. ...

Verified Answer:

The first step is to define the inputs and outputs...

Question: 40.9

A shunt motor, supplied at 250 V, runs at 900 r/min when the armature current is 30 A. The resistance of the armature circuit is 0.4 Ω. Calculate the resistance required in series with the armature to reduce the speed to 600 r/min, assuming that the armature current is then 20 A. ...

Verified Answer:

Initial e.m.f. generated is

250-30 \times 0...

Question: 37.2

What is the efficiency of energy conversion in a coal-fired power station? ...

Verified Answer:

From Table 37.1: Table 37.1 Energy conversion ...

Question: 25.22

Multiply the signed binary numbers 01010011 and 11001101. ...

Verified Answer:

Step 1: The MSBs are different therefore the produ...

Question: 36.5

The following measurements were taken on a 5 HP, four-pole, 208 V, three-phase, 60 Hz, star-connected induction motor. Determine the full per-phase equivalent circuit parameters of the induction motor. ...

Verified Answer:

(a) DC test. For this star-connected motor, the me...

Question: 32.8

The following results were obtained on a 50 kVA transformer. Opencircuit test – primary voltage, 3300 V; secondary voltage, 400 V; primary power, 430 W. Short-circuit test – primary voltage, 124 V; primary current, 15.3 A; primary power, 525 W; secondary current, full-load value. Calculate: (a) the ...

Verified Answer:

(a) Core loss

=...

Question: 32.7

Assuming the power factor of the load to be 0.8, find the output at which the efficiency of the transformer of Example 32.6 is a maximum and calculate its value. ...

Verified Answer:

With the full-load output of

500 \mathrm{k...

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