Answer:1. Letter Designation for Transistor**: - In electronic schematics, the letter designation used for transistors is "Q". Therefore, the answer is A. Q.2. Lines Indicating Mechanical Linkages: - Dashed lines are typically used in schematic diagrams to represent mechanical linkages between components or parts. Thus, the answer is B. Dashed lines.3. Punctuation Mark for Grouped Interrupted Lines: - In diagrams, brackets are used to show the destination of grouped interrupted lines. Hence, the answer is A. Bracket.4. Blank Space Around Elements: - To avoid crowding information on a schematic diagram, blank space is typically left near symbols. Thus, the answer is D. Symbols.5. Unit of Resistor Values in Schematic Diagrams: - Resistor values are usually labeled in ohms. Therefore, the answer is C. Ohms.Here is the list of the answers:1. A2. B3. A4. D5. C[tex].[/tex]