The continuous time system with impulse response h(t) = is stable, for n is even

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Signals and Systems See What Others Are Saying!

Question
The continuous time system with impulse response h(t) = is stable, for n is even, when
Options
A. a = 0
B. a > 0
C. a < 0
D. a ? 0

Correct Answer

a < 0

Explanation

The continuous time system with impulse response h(t) = is stable, for n is even, when a = 0 a > 0 a

The continuous time system with impulse response h(t) = is stable, for n is even, when a = 0 a > 0 a

The continuous time system with impulse response h(t) = is stable, for n is even, when a = 0 a > 0 a

The continuous time system with impulse response h(t) = is stable, for n is even, when a = 0 a > 0 a

For stable system exponential must be -ve so that a < 0.

More questions

1. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
Options
A. will be less than 100 N-m
B. will be more than 100 N-m
C. may be more or less than 100 N-m depending on motor parameters
D. very small

2. The phenomenon of overlap in converter operation due to
Options
A. source resistance
B. source inductance
C. both source resistance and source inductance
D. high value of firing angle

3. As the frequency is increased, the charging MVAR in a cable
Options
A. decreases
B. increases
C. remain the same
D. decreases or remains the scheme

4. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency
Options
A. must be a sub-multiple of input frequency
B. can be any frequency
C. must be an even sub-multiple of input frequency
D. must be an odd sub-multiple of input frequency

6. Out of modes TE₂₀ and TE₃₀ of propagation of electromagnetic engery
Options
A. both have the same cutoff frequency
B. TE₂₀ has lower cut off frequency as compared to TE₃₀
C. TE₃₀ has lower cutoff frequency as compared to TE₂₀
D. either (a) or (c)

7. Two function g₁(t) and g₂(t) with correlation of 6 has average power of 4 and 5 respectively. The power of g₁(t) + g₂(t) is
Options
A. 9
B. 21
C. 3
D. 15

8. An SUS is
Options
A. exactly similar to SCR but with higher rating
B. similar to UJT
C. PUT and avalanche diode connected in anti parallel
D. SCR and avalanche diode connected in parallel

9. The static equalisation circuit for thyristors connected in series is
Options
A. one resistor in series with each thyristor
B. one resistor in parallel with each thyristor
C. one resistor and one capacitor in parallel with each thyristor
D. none of the above

Comments

There are no comments.

More in Electronics and Communication Engineering: