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You Are On Multi Choice Question Bank SET 1106

55301. When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same.



55302. Which of the following is not correct for two phase servomotor?





55303. Given figure shows the magnitude plot for a system. The steady state error for unit step input is





55304. DC servomotors are, generally





55305. As the bandwidth increases, the cost of components





55306. If Nyquist plot has a encirclement of (-1 + jo) point, the system is stable if





55307. A conditionally stable system has





55308. For very low frequencies, log magnitude for the given figure is





55309. In a pneumatic bellows





55310. Assertion (A): If the Laplace transform is , the Laplaces transform of impulse response is given by Reason (R): The Laplace transform for an impulse function is 1.





55311. The polar plot of is the negative imaginary axis.



55312. The number of branches of root locus plot is equal to





55313. The action of bellows is similar to that of





55314. The given figure shows three Nyquist plots of G(s) H(s) = e-sT/[s(s + 1)] for different values of T. The curves 1, 2, 3 can be





55315. Consider the following statements: The gain margin and phase margin of an unstable system may respectively be positive, positivepositive, negativenegative, positivenegative, negative Of these statements





55316. A first order element yields almost exact duplication only for constant or slowly varying phenomenon.



55317. For a stable system





55318. If the angle of departure of root locus at s = - 1 + j is





55319. The system in the given figure





55320. The units of thermal capacitance are





55321. Assertion (A): In the given figure open loop transfer function = Reason (R): The ratio is called feed forward transfer function.





55322. Nichols chart consists of M and N locii in log magnitude versus phase diagram.



55323. If , initial and final values of i(t) are





55324. The gain margin of first and second order systems is infinite.



55325. One advantage of using polar plot is that it depicts the frequency response characteristics over the entire frequency.



55326. The force required to initiate motion between two contacting surfaces is called





55327. Assertion (A): Derivative control action cannot be used alone.Reason (R): Derivative control action is effective only during transient periods.





55328. The slope of log magnitude curve near the cut off frequency is called cut off rate.



55329. Generally a servomotor operates at





55330. If C is thermal capacitance, m is mass of liquid and c is specific heat, then




55331. Assertion (A): The concept of impulse function is useful in differentiating discontinuous functions.Reason (R):





55332. In a two phase servomotor, if R is rotor resistance, X is rotor reactance, L is rotor length D is rotor diameter then





55333. The ac motor used in servo applications is





55334. A first-order system has a time constant t. For unit ramp input, the steady state error is




55335. The system in the given figure is





55336. For the equation where Q is heat energy, Ct is thermal capacitance and θ is temperature, the analogous electrical equation is


55337. Optical encoders most commonly used in control systems are





55338. A second order system exhibits 100% overshoot. The damping ratio is





55339. The log magnitude curve for a constant gain K is a horizontal straight line at a magnitude 20 log K dB.



55340. Transfer functions of even complicated components can be found by frequency response tests.



55341. The shape of torque-speed curve of a two phase servo- motor mostly depends on





55342. In a lag network the input frequency is 100 fc where fc is critical frequency. The voltage gain is





55343. Assertion (A): Temperature control of the passenger compartment of car uses both feed forward and feedback controls.Reason (R): Feed forward control gives corrective action before the disturbance affects the output and feedback control applies corrective action after output changes.





55344. Assertion (A): Most of actual systems are non-linear.Reason (R): Non linearity may be due to saturation, dead zone, square law etc.





55345. The correct sequence of events to improve system stability is





55346. The static equation of a system is The poles of this system are located at





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