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Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-Distribution

Multiple Choice Question (MCQ) of Control Systems page-5

41. Device used for conversion of coordinates is

a) Syschros
b) Microsyn
c) Synchro resolver
d) Synchro transformer

Ans: (c)

42. Friction coefficient is usually kept low to

a) Minimize velocity-lag error
b) Maximize velocity-lag error
c) Minimize time constant
d) Maximize speed of response

Ans: (a)

43. Most common use of the synchros is as

a) Error detector
b) Transmission of angular
c) Transmission of arithmetic data
d) For synchronization

Ans: (d)

44. To decrease time of the servomechanism

a) Decreases inertia of the system
b) Increases inertia of the system
c) Increases damping of the system
d) Decreases torque of the servomotor

Ans: (a)

45. If steady state error for type 1 system for unit ramp input is kept constant, then constant output is

a) Distance
b) Velocity
c) Acceleration
d) Power

Ans: (b)

46. Servomechanism is called a proportional error device when output of the system is function of

a) Error
b) Error and its first derivative
c) First derivative of error
d) None of these

Ans: (a)

47. For type 2 system, position error arises at steady state when input is

a) Ramp
b) Step displacement
c) Constant acceleration
d) None of these

Ans: (c)

48. Which of the following motor is suitable for servomechanism?

a) A.c. series motor
b) 1 ɸ induction motor
c) 2 ɸ induction motor
d) 3 ɸ induction motor

Ans: (c)

49. To decrease the number of system

a) First integrator and then differentiator is inserted
b) First differentiator and then integrator is inserted
c) Only differentiator is inserted in the forward path
d) Only integrator is inserted in the forward path

Ans: (c)

50. Servomechanism with step-displacement input is

a) Type 0 system
b) Type 1 system
c) Type 2 system
d) Type 3 system

Ans: (b)

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