3rd Class Power Engineering - A2 Chapter 7 Exam 2025 Questions and Answers

3rd Class Power Engineering - A2
Chapter 7 Exam 2025 Questions and
Answers


e - Correct Answer✔️✔️-Resistance:


1. Limits current flow.

2. Depends on material.

3. Depends on temperature.

4. Depends on dimensions.




a. 1, 3, 4

b. 1, 2, 3

c. 1, 2, 4

d. 2, 3, 4

e. 1, 2, 3, 4.


d - Correct Answer✔️✔️-Conductive materials:


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,1. Gain resistance while temperature rises while others lose resistance.

2. Have no resistance change with temperature change.

3. Always have resistance changing directly with temperature.

4. Can vary resistance directly or inversely with temperature.




a. 1, 3, 4

b. 2, 3

c. 2, 4

d. 1, 4

e. 1, 2, 3, 4.


b - Correct Answer✔️✔️-Free valence electrons flow from _____ when connected to an electrical

supply.




a. Positive to negative.

b. Negative to positive.

c. Positive to proton.

d. Negative to proton.

e. Positive to neutron.




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, b - Correct Answer✔️✔️-Where an approximate constant speed is to be maintained between no-

load and full-load the DC motor to use would be:




a. Series.

b. Shunt.

c. Compound.

d. Separately-excited.

e. Self-excited.


c - Correct Answer✔️✔️-An electrical source could be in the form of a:


1. Battery.

2. Magnet.

3. Flux.

4. Generator.




a. 1, 2, 4

b. 2, 3

c. 1, 4

d. 2, 3, 4

e. 1, 2, 3, 4.


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