Q. If Voltage Standing Wave Ratio, (VSWR) of a wave is 2, its reflection coefficient will be a. 0 b. 1/3 c. 1/4 d. 1/2 Answer and Explanation: Answer is 1/3. The relationship between Voltage Standing Wave Ratio (VSWR) and Reflection Coefficient is given by the Following EquationsSWR=( 1+Γ )/ (1-Γ )—————1 and Γ= (SWR…
Category: MCQs
The system 2d2y/dt2+4dy/dt+8y=8x, has damping ratio______
Q. The system 2d2y/dt2+4dy/dt+8y=8x, has damping ratio______ a. 0.25 b. 0.1 c. 0.33 d. 0.5 Answer and Explanation Answer is 0.5 The given System is a second order system and is given by 2d2y/dt2+4dy/dt+8y=8x After taking the Laplace Transform we get 2s2Y(s)+4sY(s)+8Y(s)=8X(s) or (2s2+4s+8) Y(s)=8X(s) Y(s)/X(s) =8/(2s2+4s+8) so, the transfer function of the system is…
Full wave rectifier with 50 Hz input frequency
Q. Full wave rectifier with 50 Hz input frequency has output frequency_________ a. 100 Hz b. 50 Hz. c. 75 Hz d. None of the above Explanation A full-wave rectifier rectifies both cycles of the AC input i.e., it conducts two times during one cycle. The output frequency is Twice/double that of the input frequency….
Apparent power drawn by an A.C.
The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is a. 4 kVAR b. 6 kVAR c. 8 kVAR d. none of these Explanation: Fig. 1 below show the Power Triangle. It shows the relationship B/W apparent power, active and reactive…
Vertical lines on the S-plane are the lines of constant ______________
a. Peak time Tp b. Settling time Ts c. Percent Overshoot c. Rise time Answer Explanation Ans is b) Settling time Ts Solution: As Ts=4/σd where σd is real part of a complex pole. Now as shown in the above Fig. C1 below, on S-plane vertical lines represents constant real part of the imaginary poles…