All of the following are correct statements about braking EXCEPT ________
A) Kinetic energy must be absorbed by the braking system
B) Kinetic energy of a vehicle doubles when the speed doubles
C) If the vehicle weight is doubled, the kinetic energy of a moving vehicle is doubled
D) The heavier the vehicle, the greater the kinetic energy when moving
B
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A dc, separately excited motor has an armature resistance of 1 ? and field constant K? = 3 Vs. The motor is driven by a full-wave, ac/dc, SCR circuit. The triggering angle of the SCRs is 30o . The voltage on the ac side is 277 V (rms). The motor load is bidirectional and equals 120 Nm at steady state, regardless of the direction of rotation. A countercurrent braking is implemented by reversing the polarities of the motor terminals. The triggering angle of the SCRs is adjusted so that the maximum braking current is twice the steady-state value. Calculate the new steady-state speed.
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Clutch plate travel can be checked with ________
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