Dear candidates you will find MCQ questions of Antennas and Microwave Engineering here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Explanation: the condition for sustained oscillation in a colpitts oscillator is c2/c1 = gm/gi. here c1 and c2 are the capacitance in the feedback network, gm is the transconductance of the transistor and gi is the input admittance.
Explanation: the equivalent value of series combination of the capacitors is given by 1/ ω2l. this gives the equivalent capacitance value of 200 pf. c1c2/ (c1+c2) =200 pf. c1
Explanation: series resistance associated with an inductor is given by ωl/qβ.
Explanation: resonant frequency of hartley oscillator is given by 1/ 2π√(c1 (l1 + l2)). substituting the given values in the above equation, cut-off frequency is 19.89 khz.
Explanation: resonant frequency of colpitts oscillator is given by 1/2π√lcβ, where c0 is the equivalent capacitance given by c1c2/ (c1+c2). substituting and solving the equation, resonant frequency is 45.9 khz.
Explanation: β for a transistor is defined as the ratio of transconductance of the transistor to the input admittance, which is equal to the ratio of c2/c1. substituting the given values, β of the transistor is 25.
Explanation: power amplifier is the primary consumer of dc power in most hand-held wireless devices, so amplifier efficiency is an important consideration. amplifier efficiency is the ratio of rf output power to dc input power.
Explanation: snr is defined as the ratio of desired signal power to undesired noise
Explanation: noise figure is defined as the ratio of input signal to noise ratio to the output signal to noise ratio of a system or a receiver. snri is the signal to noise ratio measured at the input terminals of the device. snr0 is the output signal to noise ratio measured at the output terminals of the device.
Explanation: the equivalent noise temperature of a network given the noise figure of the network or system is given by t0(f-1). in this expression, f is the noise figure of the system. t0 has the value 290 k. t0 is the standard temperature considered.
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