Does "Found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives, electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as from the power grid, inverters or generators." contain the correct answer to "What is the main example of a DC power source?"

A: yes

Does "As for the manner in which the prayer is to be conducted, the Quran refers to prostration." contain the correct answer to "What is the name of the formal prayer proscribed by the Quran?"

A: no

Does "Shortly afterwards, Philip won the hard-fought battle of Bouvines in the north against Otto and John's other allies, bringing an end to John's hopes of retaking Normandy." contain the correct answer to "John besieged what castle?"

A:
no