26. The state transition given below is realized by a clocked JK FF.
    
    

    State	Transition
    Qn	Qn+1
    0	0
    0	1
    1	0
    1	1

    
    The JK input to realize the transition is

1. 1. J	K
      0	φ
      1	φ
      φ	1
      φ	0

   
   
   

   2. J	K
      φ	0
      φ	1
      1	φ
      0	φ

   
   
   

   3. J	K
      0	φ
      φ	0
      φ	1
      1	φ

   
   
   

   4. J	K
      1	φ
      φ	0
      0	φ
      φ	1

   
   
   

---

1. View Hint View Answer Discuss in Forum

   

   Correct Option: A

   

---

27. An X– Y flip flop, whose Characteristic Table is given below is to be implemented using a J– K flip flop.
    
    This can be done by making

1. 1. J = X, K = Y

   
   
   

   2. J = X, K = Y

   
   
   

   3. J = Y, K = X

   
   
   

   4. J = Y, K = X

   
   
   

---

1. View Hint View Answer Discuss in Forum

   
   
   K- map For K
   
   J = Y, K = X

   Correct Option: D

   
   
   K- map For K
   
   J = Y, K = X

---

---

28. A 4-bit preset table UP counter has preset input 0101. The preset operation takes place as soon as the counter becomes maximum 1111.The modulus of the counter is

1. 1. 5

   
   
   

   2. 10

   
   
   

   3. 11

   
   
   

   4. 15

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

29. The characteristic equation of the T-FF is given by

1. 1. Q⁺ = TQ + TQ

   
   
   

   2. Q⁺ = TQ + QT

   
   
   

   3. Q⁺ = TQ

   
   
   

   4. Q⁺ = TQ

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Excitation table for T-FF
   
   From the table, Q⁺ = TQ + Q T

   Correct Option: B

   Excitation table for T-FF
   
   From the table, Q⁺ = TQ + Q T

---

---

30. The Q output of a J– K flip-flop is ‘1’. The output does not change when a clock-pulse is applied.The inputs J and K will be respectively (X-denotes don’t care state)

1. 1. 0 and X

   
   
   

   2. X and 0

   
   
   

   3. 1 and 0

   
   
   

   4. 0 and 1.

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---