33, The opto coupler is most commonly called as
(A) Photo detector (8) Photo tansistor
(C) Opto isolator (10) Darlington transistor

34. The function of RC snubber circuit in lamp dimmer is
(ക) to slow down the rate of rise of voltage applied across the triac
(8) to provide smooth phase control
(0) 10 provide variable firing angle (o triac
(D) to provide effective grounding

35. Semiconductor device BPW 34158
(ക) photo diode (8) photo and varacter diode
(0) “ലേ! diode (D) photo voltaic cell

36. For a 20 picture tube, the filament voltage is
(ക) ३४/५८ (8) ‏عل ١5‎
(09 63۷ © (D) 6.3% ‏عه‎

37. Ina TV Receiver, the linearity coil is connected in
(A) Parallel with horz deflection coil
(B) Series with horz deflection coil
(C) Series with horz driver transformer
(D) Parallel with LOT

38. Bifilr IF coils has the following advantage over other IF coils
(A) maximum energy transfer from primary and secondary winding,
(8) small in size.
(8) maximum coupling between primary and secondary winding.
(D) ferrite iron core is not used as former for winding.

39. The balun transformer consists of two small 470 pF capacitors inside it. The purpose of
these capacitors is

(A) 10 8100 60 870 761171! ೩0

(8) facilitates static charging

(C) effective coupling of ac signal to tuner input
(D) 10 prevent damage due to lightning

218/2014 0 A

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