Two Small Identical Speakers Are Connected (In Phase)to the Same

question 56

Multiple Choice

Two small identical speakers are connected (in phase) to the same source.The speakers are 3 m apart and at ear level.An observer stands at X, 4 m in front of one speaker as shown.If the amplitudes are not changed, the sound he hears will be least intense if the wavelength is:

• A)1 m
• B)2 m
• C)3 m
• D)4 m
• E)5 m

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Definitions:

Wound-Rotor Induction Motor

A type of induction motor where the rotor has windings connected to slip rings, enabling variable resistance to be inserted in the rotor circuit for speed control.

Starting Torque

The initial torque produced by a motor or engine upon starting, critical for overcoming inertia and commencing rotation.

Starting Current

The initial surge of current experienced when an electric motor starts, typically much higher than the running or nominal current.

Differential Selsyn

A special type of selsyn motor.