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Match each class with its maximum efficiency.

List I

A. Class A, resistive load

B. Class A, transformer coupled

C. Class B

List II

P. Twenty-five per cent

Q. Fifty per cent

R. Seventy-eight and a half per cent

Select the correct match.

  • A.A-P, B-Q, C-R
  • B.A-Q, B-P, C-R
  • C.A-R, B-Q, C-P
  • D.A-P, B-R, C-Q

Answer: A

The pairing is A-P, B-Q, C-R. The first two differ only in their coupling, which shows that an efficiency figure belongs to a class and a coupling arrangement together rather than to the class alone. The third's transcendental value betrays its origin in integrating a half sine, and remembering that makes the odd number easier to recall than a bare figure would be.

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