28. If the primary current of transformer is twice the secondary current, then it is named

transformer.
(^) Step down (B) One to one
(C) Ideal (D) Step up

29. 1൩൦ iron-silicon alloy core 18 used in a transformer to
(^) Ensure high permeability of the magnetic circuit
(B) Keep the minimum iron loss
( (A)and (8)
(D) None of these

30. The most economically used transformer connection is for small current and high
voltage applications.
(^) Star-star (B) Delta-star
(0 Star-delta (2) Delta-delta
31. 116 octal number 752.222 is equivalent to which of the following 7
(A) ‏ئ]‎ 6 (8) 6
(൭ [LA8.A3]16 (D) )) 6

32. A 4 bit ripple counter and a 4 bit synchronous counter are made using flip flops having a
propagation delay of 10n seconds each. If the worst case delay in the ripple counter and
the synchronous counter be R and S respectively, then

(A) R=10ns, $=40ns (8) R=40ns, $= 10ns
(൭ R=10ns, ऽ =30ns (2) R=30ns, ऽ = 10௩

33. Which combinational circuit is well-known for selecting a single input from multiple
inputs & guiding the binary information to output line ?
(A) Data selector
(B) Data distributor
(C) Both data selector and data distributor
(D) De-multiplexer

34. How many NOT gates are required for the construction of a 4 to 1 multiplexer from the
followings ?

(A) 3 (B) 4
(0 2 (D) 5
35. 1 the case of adder circuits the carry propagation can be expressed as
(A) Cp=A-B (B) All but YO are LOW
(೧ Cp=A+B (0) All but YO are HIGH
36. The design and architecture of an arithmetic and logic circuit is established on which
scheme ?
(A) Sequential logic (B) Combinational logic

(C) Multiplexing (0) De-Multiplexing