Control Systems — Part 1 MCQs with Explanations

Either lie on the real axis or occur in complex conjugate pairs is the correct answer to “In root locus analysis the breakaway and break in points”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “Lag compensation permits a high gain at low frequencies.”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.”. This question is standard in competitive examination syllabi for Control Systems.

The frequency at intersection of G (j$$\omega $$) locus and M = +3 dB locus gives bandwidth of closed loop system is the correct answer to “Which of the following features is not associated with Nichols chart”. This question is standard in competitive examination syllabi for Control Systems.

Improves steady state behavior and preserves the transient response of the system is the correct answer to “A lag compensator”. This question is standard in competitive examination syllabi for Control Systems.

Increases the stability margin and speeds up the transient-response. is the correct answer to “A lead compensator”. This question is standard in competitive examination syllabi for Control Systems.

Both phase and gain margins is the correct answer to “The relative stability of a system is given by”. This question is standard in competitive examination syllabi for Control Systems.

Thermal, hydraulic and pneumatic systems is the correct answer to “Transport lag usually exists in”. This question is standard in competitive examination syllabi for Control Systems.

Electric motor actuator is the correct answer to “Robotic manipulator arms mostly use”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “Nichol’s chart is symmetric about -180° axis.”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.”. This question is standard in competitive examination syllabi for Control Systems.

Motor friction and load is the correct answer to “In the field controlled motor the entire damping comes from”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “In Bode plots the frequency at which two asymptotes meet is called corner frequency.”. This question is standard in competitive examination syllabi for Control Systems.

Both (a) and (b) is the correct answer to “Integral control action”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.”. This question is standard in competitive examination syllabi for Control Systems.

Inversely proportional to gain constant is the correct answer to “For type 1 system the velocity lag error is”. This question is standard in competitive examination syllabi for Control Systems.

Bode plot is the correct answer to “The effect of adding poles and zeros can be determined quickly by”. This question is standard in competitive examination syllabi for Control Systems.

1 and 2 is the correct answer to “Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator”. This question is standard in competitive examination syllabi for Control Systems.

Analog or digital electrical signal is the correct answer to “In control systems the output of sensor usually, is”. This question is standard in competitive examination syllabi for Control Systems.

M = 1 straight line and real axis is the correct answer to “M circles are symmetrical with respect to”. This question is standard in competitive examination syllabi for Control Systems.

Gain margin is close to 1 or phase margin is zero is the correct answer to “A system is highly oscillatory if”. This question is standard in competitive examination syllabi for Control Systems.

Phase relation of voltages applied to the two stator windings is the correct answer to “In a two phasor servomotor, the direction of rotation of the rotating field depends on”. This question is standard in competitive examination syllabi for Control Systems.

Wind screen wiper is the correct answer to “Which of the following is open loop system”. This question is standard in competitive examination syllabi for Control Systems.

Higher frequencies of oscillations is the correct answer to “The poles with greater displacement from the real axis correspond to”. This question is standard in competitive examination syllabi for Control Systems.

Photodiode is the correct answer to “The sensor generally used in incremental optical encoder is”. This question is standard in competitive examination syllabi for Control Systems.

Impedance Z is the correct answer to “In force current analogue, mechanical mobility is analogous to”. This question is standard in competitive examination syllabi for Control Systems.

Magnitude and phase angle loci in log-magnitude versus phase diagram is the correct answer to “Nichols chart consists of”. This question is standard in competitive examination syllabi for Control Systems.

Power amplification is the correct answer to “Magnetic amplifier is used for”. This question is standard in competitive examination syllabi for Control Systems.

Derivative is the correct answer to “Which control action can never be used alone”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “Nyquist stability criterion uses open loop frequency response characteristics.”. This question is standard in competitive examination syllabi for Control Systems.

Magnetic flux linkage is the correct answer to “In force current analogy, displacement x is analogous to”. This question is standard in competitive examination syllabi for Control Systems.

less than 1 is the correct answer to “If the poles lie in second quadrant, damping ratio is”. This question is standard in competitive examination syllabi for Control Systems.

less than 1 is the correct answer to “If poles lie in first quadrant, damping ratio is”. This question is standard in competitive examination syllabi for Control Systems.

Both (a) and (b) is the correct answer to “In a simple on-off controller with differential gap, the magnitude of differential gap determines”. This question is standard in competitive examination syllabi for Control Systems.

True is the correct answer to “Bandwidth is proportional to speed of response.”. This question is standard in competitive examination syllabi for Control Systems.

Uqndamped natural frequency is the correct answer to “The distance of poles from origin depends on”. This question is standard in competitive examination syllabi for Control Systems.

Rotor is the correct answer to “The permanent magnet field system of brushless dc servo- motor is generally on”. This question is standard in competitive examination syllabi for Control Systems.

A family of circles is the correct answer to “For any transfer function, the constant phase angle loci are”. This question is standard in competitive examination syllabi for Control Systems.

To the right is the correct answer to “The addition of a pole to the open loop transfer function pulls the root locus”. This question is standard in competitive examination syllabi for Control Systems.

Both A and B is the correct answer to “DC tachogenerator can be used in”. This question is standard in competitive examination syllabi for Control Systems.