When phase-lag compensation is used in a system, then gain cross over frequency,

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Exam Questions Papers Comments

Question
When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively
Options
A. Increased, Increased, Increased
B. Increased, Increased, Decreased
C. Increased, Decreased, Decreased
D. Decreased, Decreased, Decreased

Correct Answer

Decreased, Decreased, Decreased

Explanation

Phase lag is delay between a correcting signal of control system and response to it.

Exam Questions Papers problems

Search Results

1. Consider a unity feedback control system with open-loop transfer function The steady state error of the system due to a unity step input is :
Options
A. zero
B. K
C. 1/K
D. infinite

2. Radiation resistance of an antenna is 54 ? and loss resistance is 6 ?. If antenna has power gain of 10, then directivity is:
Options
A. 9
B. 11.11
C. data not sufficient
D. 10

3. A noiseless 3 KHz channel can transmit binary at the rate __________ .
Options
A. 12000 bps
B. 10000 bps
C. 6000 bps
D. 3000 bps

4. A rectangular waveguide, in dominant TE mode, has dimensions 10 cm x 15 cm. The cut off frequency is
Options
A. 10 GHz
B. 1 GHz
C. 15 GHz
D. 25 GHz

5. The analog signal given below is sampled at 1200 samples per second. m(t) = 2 sin 120 pt + 3 sin 240 pt + 4 sin 360 pt + 5 sin 480 pt + 6 sin 600 pt + 7 sin 720 pt. The folding (maximum) frequency is __________ .
Options
A. 300 Hz
B. 360 Hz
C. 600 Hz
D. 480 Hz

6. What is the propagation constant for air filled wave guide with dimensions a = 1.59" and b = 0.795" at 4.95 GHz?
Options
A. 0.6698
B. 0.7698
C. 0.503
D. 0.6598

7. The equivalent form of the logical expression ABC + A BC + ABC + ABC + AB C is
Options
A. C + (A ? B)
B. (A + B + C)(A + B + C)
C. (A + B + C)(A + B + C)(A + B + C)
D. (A + B + C)(A + B + C)(A + B + C)

8. An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE₁₀ mode is
Options
A. 1.5 x 10⁸ m/s
B. 5.5 x 10⁸ m/s
C. 3.46 x 10⁸ m/s
D. 0.18 x 10⁷ m/s

9. If x[n] then the sequence x[n] is
Options
A. non-periodic
B. periodic
C. depends on n
D. none of these

10. The impulse response and the excitation function of a linear time invariant causal system are shown in figure (a) and (b) respectively. The output of the system at t = 2 sec is equal to
Options
A. 0
B. 2
C.
D.

Comments

There are no comments.

More in Electronics and Communication Engineering: