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41.

42.

43,

45.

46.

47,

48.

The luminance signal is delayed by approximately
(ಗಿ). 100/5 (8) 60/5
(0೮). 120/5 (0) 30/5

The function of using a squelch circuit in a TV receiver is
(A) 10 boost the higher frequencies.

(B) toimprove the frequency response of amplifiers.

(0) mute audio output during the absence of video signal.
(D) to improve the S/N ratio.

The sensitivity of an oscilloscope depends on
(A) vertical amplifier {B) sweep oscillator
(0) horz amplifier {D) CRT

The impedance of Yagi - Uda antenna 15
(^) 100 08111 (8) 300 001%
(^) 200 01111 (12) 75 ohm

Which of the following gate has high output when its inputs are different ?
(A) NAND gate (B) EXNOR gate
(0 NOR gate (D) EXOR gate

In RS flip flop using NAND gates, the race condition occurs when its inputs are
(^) 0.0 (B) 01
(^) 10 o L1

The BCD equivalent of decimal 38 is
(A) 10000011 (B) 00111000
(0 00111001 (D) 00100110

The voltage across the diode in a half wave rectifier when it is non-conducting 15
(4) 0 (B) isconstantat 0.3 V
(7) ۷ (D) same as the input voltage

PN junctions are called bipolar devices because
(வி they contain both P and N layers
(8) conduction is due to both hole and electron currents
(0) they work with both +ve and —ve supplies
(D) all of the above
7 218/2014