1) Which among the following controls the speed of D.C. motor?
a. Galvanometer
b. Gauss meter
c. Potentiometer
d. Tachometer
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2) Into which energy signal does the position sensor convert the measured position of servomotor in servomechanisms?
a. Mechanical
b. Electrical
c. Thermal
d. Light
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3) What is the value of steady state error in closed loop control systems?
a. Zero
b. Unity
c. Infinity
d. Unpredictable
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4) A good control system should be sensitive to __________
a. Internal disturbances
b. Environmental parameters
c. Parametric variations
d. Input signals (except noise)
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5) For the transfer function given below, where does the zero of the system lie?
G(s) = 5s -1 / s2 + 5s + 4
a. s = -1 & s = -1/4
b. s = -4 & s = -1
c. s = 1/5
d. s = -1/5
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6) If a signal is passed through an integrator, it _____the amplitude of noise signal.
a. Enhances
b. Reduces
c. Stabilizes
d. Factorizes
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7) Laplace transform of an impulse response is regarded as _____function of the system
a. Analytic
b. Parabolic
c. Transfer
d. Hypothetical
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8) The fundamental function of a tachometer is the conversion of angular _______ into voltage
a. Velocity
b. Displacement
c. Acceleration
d. Current
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9) If finite number of blocks are connected in series or cascade configuration, then how are the blocks combined algebraically?
a. By addition
b. By multiplication
c. By differentiation
d. By integration
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10) Associative law for summing point is applicable only to those summing points which are __________connected to each other.
a. Directly
b. Indirectly
c. Orthogonally
d. Diagonally
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11) For the elimination of feedback loops, the derivation based on transfer function of ______ loop is used.
a. Open
b. Closed
c. Both a and b
d. None of the above
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12) In block diagram representation, what do the lines connecting the blocks, known as?
a. Branches
b. Nodes
c. Datums
d. Sources
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13) In a signal flow graph method, how is an overall transfer function of a system obtained?
a. Poisson's equation
b. Block diagram reduction rules
c. Mason's equation
d. Lagrange's equation
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14) While solving signal flow graph using Mason's gain equation, what does the second letter in two subscript notation of 'L' stand for?
a. Serial number of loop
b. Parallel number of loop
c. Number of touching loops
d. Number of non-touching loops
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15) For which systems are the signal flow graphs applicable?
a. Causal
b. Invertible
c. Linear time invariant system
d. Dynamic
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16) Two loops are said to be non-touching only if no common ______exists between them.
a. Loop
b. Feedback path
c. Branch
d. Node
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17) In time domain system, which response has its existence even after an extinction of transient response?
a. Step response
b. Impulse response
c. Steady state response
d. All of the above
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18) Which among the following is represented by a parabolic input signal?
a. Position
b. Force
c. Velocity
d. Acceleration
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19) Type 0 systems are unsuitable ___________
a. For ramp inputs
b. If the input is parabolic in nature
c. Both a and b
d. None of the above
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20) If a type 0 system is subjected to step input, what is its effect on steady state error?
a. It increases continuously
b. It remains constant
c. It decreases monotonically
d. It gets subjected to another input
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21) Consider that the pole is located at origin and its laplace representation is 1/s. What would be the nature of pole response?
a. Rising exponential
b. Decaying exponential
c. Sinusoidal
d. Constant value
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22) In accordance to relative stability, the settling time exhibits inversely proportional nature to ________parts of roots
a. Real positive
b. Real negative
c. Imaginary positive
d. Imaginary negative
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23) In Routh array, if zero is found in the first column, then by which term it needs to be replaced?
a. δ
b. η
c. σ
d. ε
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24) In a second order system, if the damping ratio is greater than equal to '1', then what would be the nature of roots?
a. Imaginary
b. Real and equal
c. Real but not equal
d. Complex conjugate
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25) For drawing root locus, the angle of asymptote yields the direction along which _________branches approach to infinity.
a. p + z
b. p - z
c. p / z
d. p x z
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26) Which point on root locus specifies the meeting or collision of two poles?
a. Centroid
b. Break away point
c. Stability point
d. Anti-break point
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27) What should be the nature of root locus about the real axis?
a. Assymetric
b. Symmetric
c. Exponential
d. Decaying
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28) If the system is specified by open loop transfer function G(s)H(s) = k / s(s+3) (s + 2), how many root loci proceed to end at infinity?
a. 2
b. 3
c. 5
d. 6
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29) Which plots in frequency domain represent the two separate plots of magnitude and phase against frequency in logarithmic value?
a. Polar plots
b. Bode plots
c. Nyquist plots
d. All of the above
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30) How is the sinusoidal transfer function obtained from the system transfer function in frequency domain?
a. Replacement of 'jω' by 's'
b. Replacement of 's' by 'ω'
c. Replacement of 's' by 'jω'
d. Replacement of 'ω' by 's'
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31) According to the principle of log-scales, if the ratio between two points is same, then the two points get ________equally.
a. United
b. Separated
c. Multiplexed
d. Mixed
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32) If a pole is located at origin, how does it get represented on the magnitude plot?
a. -10 log (ω) dB
b. -20 log (ω) dB
c. -40 log (ω) dB
d. -60 log (ω) dB
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33) Due to an addition of pole at origin, the polar plot gets shifted by ___ at ω = 0?
a. -45°
b. -60°
c. -90°
d. -180°
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34) Consider the system represented by the equation given below. What would be the total phase value at ω = 0?
200/ [s3 (s + 3) (s + 6) (s + 10)]
a. -90°
b. -180°
c. -270°
d. -360°
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35) Which among the following are the interconnected units of state diagram representation?
a. Scalars
b. Adders
c. Integrators
d. All of the above
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36) Which among the following plays a crucial role in determining the state of dynamic system?
a. State variables
b. State vector
c. State space
d. State scalar
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37) In P-D controller, the derivative action plays a significant role in increasing _______ of response.
a. Time
b. Distance
c. Speed
d. Volume
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38) In addition to storage instructions, PLC controls __________
a. Logic sequence timing
b. Counting
c. Arithmetic operations
d. All of the above
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39) Which is the correct sequence of operational steps necessary for proper operation of an elevator (lift) control mechanism?
1. Up switch
2. Stop switch
3. Down switch
4. Start switch
a. 1-2-3-4
b. 2-1-4-3
c. 4-2-1-3
d. 3-1-2-4
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40) How many digital inputs are present in PLCs?
a. 4
b. 8
c. 16
d. 32
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