#### Electrical engineering

• ( 1 ) Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform?

• 1) Triangular
• 2) Trapezoidal
• 3) Rectangular
• 4) Semi-circular
• Discussion in forum
Solution : If two rectangular waveforms of duration t1 and t2 seconds are convolved. then the shape of the resulting waveform is Trapezoidal.

discussion

• ( 2 ) FIR digital filter having __________ stability than FIR filter.

• 1) good stability
• 2) poor stability
• 3) stability not guarnteed
• 4) poor stability
• Discussion in forum
Solution : FIR digital filter having good stability stability than FIR filter.

discussion

• ( 3 ) For Ergodic Process

• 1) ensemble Average equal to time Average
• 2) ensemble Average is not equal to time Average
• 3) ensemble Average > Time Average
• 4) ensemble Average < Time Average
• Discussion in forum
Answer : 1) ensemble Average equal to time Average
Solution : For Ergodic Process ensemble Average equal to time Average

discussion

Answer : 1) ensemble Average equal to time Average

• ( 4 ) Which of the following is/are not a property/properties power spectral density function Sx(ω)?

• 1) Sx(ω) is real function of ω
• 2) Sx(ω) is a even function of ω
• 3) Sx(ω) is a odd function of ω
• 4) Sx(ω) is non-positive function of ωSx(ω) ≤ 0 for all ω
• Discussion in forum
Answer : 4) Sx(ω) is non-positive function of ωSx(ω) ≤ 0 for all ω
Solution : Properties of power spectral density function Sx(ω):
Sx(ω) is real function of ω
Sx(ω) is a even function of ω
Sx(ω) is a odd function of ω

discussion

Answer : 4) Sx(ω) is non-positive function of ωSx(ω) ≤ 0 for all ω

• ( 5 ) In a complex wave, the negative half of the wave is a reproduction of the positive half wave. Then

• 1) the wave does not contain triple harmonics
• 2) the wave does not contain odd harmonics
• 3) the wave does not contain even harmonics
• 4) the wave contains only fundamental and third harmonic
• Discussion in forum
Answer : 3) the wave does not contain even harmonics
Solution : In a complex wave, the negative half of the wave is a reproduction of the positive half wave. Then the wave does not contain even harmonics

discussion

Answer : 3) the wave does not contain even harmonics

• ( 6 ) The integral of k u(t) is

• 1) 1/k δ(t)
• 2) k δ(t)
• 3) a ramp of slope 1/k
• 4) a ramp of slope k
• Discussion in forum
Answer : 4) a ramp of slope k
Solution : The integral of k u(t) is a ramp of slope k

discussion

Answer : 4) a ramp of slope k

• ( 7 ) The discrete time system describes by y(n) = x(n2) is

• 1) non-casual, non-linear, time variant
• 2) non-casual, Linear, time invariant
• 3) casual, non-linear, timevari
• 4) casual, Linear, time varying
• Discussion in forum
Answer : 4) casual, Linear, time varying
Solution : The discrete time system describes by y(n) = x(n2) is casual, Linear and time varying

discussion

Answer : 4) casual, Linear, time varying

• ( 8 ) The inverse Laplace transform of 1/(s - a)2 is

• 1) eat
• 2) t eat
• 3) t2 eat
• 4) eat/t
• Discussion in forum
Solution : The inverse Laplace transform of 1/(s - a)2 is t eat

discussion

• ( 9 ) For a second order system, damping ratio ζ is such that 0 < ζ <. Then the roots of characteristic equation are

• 1) real but not equal
• 2) imaginary
• 3) complex conjugate
• 4) real and equal
• Discussion in forum
Solution : For a second order system, damping ratio ζ is such that 0 < ζ <. Then the roots of characteristic equation are complex conjugate

discussion

• ( 10 ) The tree selected for the formation of state equations contains

• 1) all voltage sources
• 2) all capacitors
• 3) all inductors and current sources
• 4) all voltage sources and maximum number of capacitors
• Discussion in forum
Answer : 4) all voltage sources and maximum number of capacitors
Solution : The tree selected for the formation of state equations contains all voltage sources and maximum number of capacitors

discussion

Answer : 4) all voltage sources and maximum number of capacitors