55403. Examine the following statements A small size hydraulic actuator can develop good torque.It is easy to maintain a hydraulic system leak proof.Both linear and rotatary hydraulic actuators are available.Hydraulic power is more easily available than electric power. Which of the above statements are correct?
55404. The given figure shows a constant current source driving a parallel RC circuit. It is equivalent to
55405. Consider the following statements regarding negative feedback It increases system gainIt improves sensitivityIt improves system stability Which of these are not correct?
55406. Which of the following are applications of position control systems?
55407. The system in the given figure has
55408. Assertion (A): Increasing the system gain improves steady state behaviour but may result in instability.Reason (R): A compensator is inserted into a system to ensure specified performance.
55409. Assertion (A): Inverse Laplace transform can be found from P(s) by inversion integral.Reason (R): The function f(t) is assumed to be zero for t < 0.
55410. For a second order system delay time td is the time required to reach
55411. Coulomb friction is
55412. A feedback amplifier has forward gains A1, A2 and feedback factor β as shown in signal flow graph of the given figure. Because of feedback as shown in signal noise ratio at output will
55413. For the system in the given figure . Then steady state error is
55414. The damping ratio of a pair of complex poles when expressed in terms of angle θ measured from jω axis equal to
55415. Assertion (A): Derivative control action is also called rate control and has an anticipatory character.Reason (R): Derivative control amplifies noise signals.
55416. Assertion (A): When a PID controller is added to a system, the peak overshoot to step input cannot be determined easily.Reason (R): Use of PID controller introduces a zero in the forward path.
55417. For the system shown in the given figure the time response to unit step input is
55418. The slope of log magnitude asymptote changes by - 40 dB/ decade at a certain frequency and the error between asymptote and actual curve is - 6 dB. This means that
55419. Friction forces acts in a direction
55420. Assertion (A): Integral control action is sometimes called reset control.Reason (R): Reset rate is expressed as number of repeats per unit time.
55421. Charaka was the famous ......... of ancient India?
55422. In some on-off controllers a differential gap is provided
55423. If there are
55424. In Bode analysis the correction at corner frequency is 3 dB.
55425. The transfer function G(s) of a PID controller is
55426. In a proportional plus integral control action
55427. An RLC series circuit has
If poles p1 and p1 are close to jω axis, then
55428. A reactance function
55429. The Greek Philosopher who was never written a book is?
55430. Consider the following systems
System I,
System II,
where C(s) is the output and R(s) is the input of these systems
55431. Nyquist stability criterion is based on a theorem from the theory of complex variables.
55432. For the function G(s) H(s) = the phase cross-over frequency is
55433. While forming Routh's array, the situation of a row of zeros indicates that the system
55434. Assertion (A): In liquid system the ratio of change in liquid level to change in flow rate is called resistance of liquid flow.Reason (R): In liquid level systems the ratio of change in liquid stored in a tank to the change in head is called capacitance of tank.
55435. The frequency at which phase angle is 180° is called
55436. In a mechanical accelerometer, the steady state displacement is a measure of
55437. A unity feedback system has . If input r(t) = 1 + 2t + t3, the steady error is
55438. Assertion (A): The root locus of a control system is symmetrical about real axis.Reason (R): For all polynomials with real coefficients, complex poles always occur in conjugate pairs.
55439. In log magnitude Bode diagram the slope of high frequency asymptote of (1 + jωT) is
55440. A compensator has its pole and zero as shown in the given figure
55441. For a stable system having two or more gain crossover frequencies the phase margin is measured
55442. In a second order system, peak overshoot is independent of
55443. Nyquist plot provides information about absolute stability as well as relative stability.
55444. Power handling capacity of wire wound potentiometer used in control systems is about
55445. Where is the headquarters of South Commission?
55446. For a factor the log
55447. The number of stator field windings in an ac tachometer are
55448. The radius of constant -N circle for N=1 is
55449. In using Nyquist stability criterion it is not necessary to determine closed loop poles.
55450. The polar plot of transport lag is a unit circle.