11 Which of the following statements is true? A) The internal resistance of an ammeter is very high. B) The internal resistance of a voltmeter is very low. C) An ammeter measures current and should not be connected in parallel. D) A voltmeter measures voltage and should be connected in series. E) None of the above. 12 Given an analog signal with highest frequency of 30 KHz, what is the minimum sampling rate needed in order to make the signal can be reconstructed perfectly? A) 15 KHz B) 30 KHz C) 40 KHz D) 50 KHz E) 60 KHz answer in typing format please all subpart is compulsory please 13 What is the equivalent resistance between terminals a and b? A) 28 ohms B) 11.4 ohms C) 12 ohms D) 15 ohms E) 10 ohms 1292 www 20 Ω 60 Ω 30 52 4052 oa ob please answer all questions, much appreciated. Thank you.

If the frequency of the input signal applied to a full wave rectifier is 120 Hz, then what will be the frequency of the output signal?

Consider two amplififiers with the following parameters: Amplififier A: Gain = 20 dB; Noise ratio, NR = 1.05 Amplififier B: Gain = 20 dB; Noise ratio, NR = 4.1 Identify the amplififier that adds the least internal noise to the input signal and determine its noise fifigure in dB.