TIG special Test 2 third year

The short circuit impedance is given by 18 ohm and the characteristic impedance is 50 ohm. Find the open circuit impedance.

• 138.8
• 188.3
• 388.1
• 838.1

For a load impedance of ZL=60-j80. Design of 2 single-stub shunt tuning networks to match this load to a 50Ω line is to be done. What is the normalized admittance?

• 1+j
• 0.3+j0.4
• 0.4+j0.3
• 0.3-j0.4

If the normalized admittance at a point on a transmission line to be matched is 1+j1.47. Then the normalized susceptance of the stub used for shunt stub matching is:

• 1 Ω
• 1.47 Ω
• -1.47 Ω
• -1 Ω

 In series stub matching, if the normalized impedance at a point on the transmission line to be matched is 1+j1.33. Then the reactance of the series stub used for matching is:

• 1 Ω
•  -1.33 Ω
• -1 Ω
• 1.33 Ω

The characteristic impedance of a line having open and short impedances of 20 and 5 respectively is

• 20
• 100
• 250
• 10

A spectrum of 30 MHz is allocated to a cellular system which uses two 25 KHz simplex channels to provide full duplex voice channels. What is the number of channels available per cell for 4 cell reuse factor?

• 150 Channels
• 100 Channels
• 200 Channels
• 115 Channels

Which among the following processing steps combine multiple OFDM subcarriers into a single signal for transmission?

• Serial to Parallel conversion
• FFT
• IFFT
• Channel Mapping

High capacity mobile systems are ______________ limited systems.

• interference
• noise
• bandwidth
• error

Which among the following replaces the static sine pulses of OFDM to improve flexibility?

• Wavelet bases
• Triangular pulses
• Impulse bases
• Ramp pulses

Which of the following is the most significant characteristic for GMSK modulation?

• Minimum ISI
• Minimum error rate
• Better spectral efficiency than PSK and its variants
• Variable envelope property and discontinuous phases at envelope