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101.	The expression of short circuit impedance Zsc is?(a) Zsc=(Z1^2-4Z1Z2)/(2Z1-4Z2)(b) Zsc=(Z1^2+4Z1Z2)/(2Z1+4Z2)(c) Zsc=(Z1^2-4Z1Z2)/(2Z1+4Z2)(d) Zsc=(Z1^2+4Z1Z2)/(2Z1-4Z2)I have been asked this question by my college director while I was bunking the class.The doubt is from Filter Networks topic in portion Filters and Attenuators of Network Theory
Answer» The correct CHOICE is (b) Zsc=(Z1^2+4Z1Z2)/(2Z1+4Z2) The BEST I can explain: On short circuiting the port 2 of T-section, we get the expression of short circuit IMPEDANCE Zsc as Zsc=(Z1/2)+((Z1/2)XZ2)/((Z1/2)+Z2). On solving we get Zsc=(Z1^2+4Z1Z2)/(2Z1+4Z2).

102.	The expression of the characteristic impedance of a symmetrical T-section is?(a) ZOT=√(Z1^2/4-Z1Z2)(b) ZOT=√(Z1^2/4+Z1)(c) ZOT=√(Z1^2/4+Z2)(d) ZOT=√(Z1^2/4+Z1Z2)The question was posed to me at a job interview.My query is from Filter Networks topic in chapter Filters and Attenuators of Network Theory
Answer» The CORRECT option is (d) ZOT=√(Z1^2/4+Z1Z2) Explanation: For a T-section, the VALUE of input IMPEDANCE when it is terminated in Zo is Zin=(Z1/2)+(Z2((Z1/2)+Zo))/((Z1/2)+Z2+Zo) and Zin=Zo. On solving, the expression of the characteristic impedance of a symmetrical T-section is ZOT=√(Z1^2/4+Z1Z2).

103.	The expression of the open circuit impedance Zoc is?(a) Zoc=Z1/2+Z2(b) Zoc=Z2/2+Z2(c) Zoc=Z1/2+Z1(d) Zoc=Z1/2-Z2The question was asked by my college director while I was bunking the class.My question is taken from Filter Networks in division Filters and Attenuators of Network Theory
Answer» The correct option is (a) Zoc=Z1/2+Z2 The EXPLANATION is: On OPEN circuiting the PORT 2 of T-section, we get the expression of the open circuit IMPEDANCE Zoc as Zoc=Z1/2+Z2.

104.	A filter that passes all frequencies lying outside a certain range, while it attenuates all frequencies between the two designated frequencies is called?(a) low pass filter(b) high pass filter(c) band elimination filter(d) band pass filterThis question was posed to me during an online interview.My query is from Filter Networks topic in section Filters and Attenuators of Network Theory
Answer» The CORRECT choice is (C) band elimination filter For EXPLANATION I would say: A band elimination filter passes all frequencies lying outside a CERTAIN range, while it attenuates all frequencies between the two DESIGNATED frequencies. It is also referred to as band stop filter.

105.	A filter that passes frequencies between two designated cut-off frequencies and attenuates all other frequencies is called?(a) high pass filter(b) band elimination filter(c) band pass filter(d) low pass filterI had been asked this question in final exam.My question comes from Filter Networks in chapter Filters and Attenuators of Network Theory
Answer» Right answer is (c) band pass filter To explain I WOULD say: A band pass filter passes frequencies between two DESIGNATED cut-off frequencies and attenuates all other frequencies. A band pass filter has two cut-off frequencies and will have the pass band f2-f1; f1 is the lower cut-off frequency, f2 is the UPPER cut-off frequency.

106.	A filter which attenuates all frequencies below a designated cut-off frequency fc and passes all other frequencies greater than fc is called?(a) band elimination filter(b) band pass filter(c) low pass filter(d) high pass filterThe question was posed to me in my homework.I want to ask this question from Filter Networks topic in chapter Filters and Attenuators of Network Theory
Answer» CORRECT answer is (d) high pass FILTER The best I can explain: A filter is called high pass filter if ATTENUATES all frequencies below a DESIGNATED cut-off frequency fc and passes all other frequencies greater than fc. THUS the pass band of this filter is the frequency range above fc and the stop band is the frequency range below fc.

107.	A filter which passes without attenuation all frequencies up to the cut-off frequency fc and attenuates all other frequencies greater than fc is called?(a) high pass filter(b) low pass filter(c) band elimination filter(d) band pass filterI had been asked this question in an online interview.My query is from Filter Networks topic in division Filters and Attenuators of Network Theory
Answer» Right choice is (b) low pass FILTER To explain I would say: A filter is CALLED a low pass filter if it passes all FREQUENCIES up to the cut-off frequency fc without attenuation and attenuates all other frequencies greater than fc. This transmits CURRENTS of all frequencies from ZERO up to the cut-off frequency.

108.	The value of one decibel is equal to?(a) 0.115 N(b) 0.125 N(c) 0.135 N(d) 0.145 NI got this question during an online interview.Origin of the question is Filter Networks in section Filters and Attenuators of Network Theory
Answer» The correct CHOICE is (a) 0.115 N For explanation: The VALUE of ONE DECIBEL is equal to 0.115 N. One decibel = 0.115 N where N is the number of nepers and N = LOGE(V1/V2).

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