Question

441. DC machines are generally designed for maximum efficiency
around
(a) full load. (b) 75% (c) 50%
(d) 25%
offfion
fede machine​

Answer 1

Answer:

option b

that is 75%

hope it helps you

Answer 2

DC machines are commonly designed for maximum performance

around the full load.

Explanation:

• Electric motor performance is the ratio between electricity output (mechanical) and electricity input (electrical).

• The performance of any machine (such as DC motors) is described as the “Percentage of output electricity/enter electricity”.
• Formula for performance is: Efficiency = 100 * output electricity / enter electricity
• Higher the performance, the higher the motor. For a great motor, the performance is 100%. Needless to say, performance can't be extra than 100%.
• For a DC motor, the output electricity in Watts is angular speed (radians/sec) * torque (Nm).
• Input electricity in Watts is implemented voltage * current.

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