def default_tc_k_factor_curve():
    """
    Returns a default k factor curve for a generic torque converter.

    :return:
        k factor curve.
    :rtype: callable
    """
    from ..defaults import dfl
    par = dfl.functions.default_tc_k_factor_curve
    a = par.STAND_STILL_TORQUE_RATIO, par.LOCKUP_SPEED_RATIO
    from . import define_k_factor_curve
    return define_k_factor_curve(*a)
