76. For a npn BJT transistor fβ is 1.64 x 108 Hz. Cμ = 10-14 F; Cp = 4 x 10-13 F and DC current gain is 90. Find fT and gm (fβ = cut off frequency, Cμ = capacitance, Cp = parasitic capacitance, gm = transconductance, fT = gain BW product)
77. The impulse response h(t) of a linear time-invariant continuous time system is described by h(t) = exp (a t) u(t) + exp (βt) u (- t), where u(t) denotes the unit step function, and a and β are constants. This system is stable if
78. The heat coming out of the sun is in the form of?
79.
ωL =
80. An 8 level encoding scheme is used in a PCM system of 10 kHz channel BW. The channel capacity is
81. For the power amplifier circuit shown below, the maximum power dissipated by both output transistor is
82. For static electric and magnetic fields in an homogenous source-free medium, which of the following represents the correct form of Maxwell's equations?
83. A periodic rectangular signal, x(t) has the waveform shown in the given figure. Frequency of the fifth harmonic of its spectrum is __________
84. An antisymmetric filter having odd number of coefficient may have a performance as
85. A material has conductivity of 105 mho/m and permeability of 4p x 10-7 H/m. The skin depth at 9 GHz is
86. Choose the set of correct chronological order of dynasties?
87. The steady state error of a stable type 0 unity feedback system for a unit step function is :
88. Find RTH across the terminals A and B
89. Find Y- parameters
90. For a second-order system with the closed-loop transfer function The settling time for 2-percent band, in seconds, is :
91. An open loop transfer function is given by has
92. The current i(t) through a 10 Ω resistor in series with an inductance is given by i(t) = 3 + 4 sin (100t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are
93. The cut off voltage for JFET is 5 V. The pinch off voltage is __________ .
94. Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.
95. The circuit given below is:
96. Rank of the matrix:
97. His rather casual remarks on politics __________ his lack of seriousness about the subject.
98. The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts, the digital output of the ADC will be
99. The maximum percent overshoot with maximum value of first overshoot as 3.5 V and steady state value as 2.575 V is
100. Find Vo(t) for the following circuit.
Data: L = 1 H, C = 1 F, R1 = R2 = 1 Ω and zero initial conditions.