Assume active mode for circuit 1
(a)Ve = 1.30 V
(b)Ic = 9.90e-004 A
(c)Ve = 3.03 V
Thus the circuit operates in an active mode

For circuit 2,assume active mode
(a)Ve = 1.7 V
(b)Ie = 4.30e-004 A
(c)Vc = 4.30 V
This circuit operates in a saturated mode

For circuit 3,assume active mode
(a)Ve = -4.3 V
(b)Ie = 6.9000e-005 A
(c)Ic = 6.832e-005 A
(d)Vc = -40.2 V
The circuit operates in an active mode

For circuit 4,assume active mode
(a)Ie = 1.86e-003 A
(b)Vc = -13.68 V
The circuit operates in an active mode