BSNL Online Test Control System 1 (Tta) PDF
BSNL Online Test Control System 1 (Tta) PDF
BSNL Online Test Control System 1 (Tta) PDF
INSTRUCTIONS-
1.NUMBER OF QUESTIONS 25
2.HAS A TIME LIMIT OF 15 MINUTES
3.HAS A PASS MARKS OF 30%
4.QUESTIONS PER PAGE 1
5.EACH QUESTIONS HAS 1 MARKS
6.NEGATIVE MARKING FOR EACH QUESTIONS IS 0.25
7.WILL ALLOW TO YOU GO BACK ,SKIP AND CHANGE YOUR ANSWERS
8.WILL ALLOW TO YOU PRINT OUT YOUR RESULT AND CERTIFICATE
9.WILL ALLOW TO YOU PRINT OUT YOURS RESPONSE SHEET WITH
CORRECT ANSWER KEY AND EXPLANATION
Max Time Al lowed: 15 mi n
Q.1) Which of the following statements is correct for a system with gain margin close to unity or a
phase margin close to zero ?
A. T he system is relatively stable
B. oscillations
C. positive sign
D. step input
Q.3) .A closed loop system is distinguished from open loop system by which of the following ?
A. Output pattern
B. Servomechanism
C. Input pattern
D. Feedback
Q.5) .Which of the following statements is not necessarily correct for open control system ?
A. Less expensive
D. Input command is the sole factor responsible for providing the control action
Q.6) Which of the following statements is correct for any closed loop system ?
A. None of the above
B. Only one of the static error co-efficient has a finite non-zero value
B. resistance
C. charge
D. current
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Q.8) .In closed loop control system, with positive value of feedback gain the overall gain of the system
will
A. decrease
B. be unaffected
C. increase
Q.9) .Zero initial condition for a system means.Zero initial condition for a system means
A. no initial movement of moving parts
B. vibrations
D. oscillations
B. internal forces
C. friction
D. stored energy
B. Meta dyne
Q.14) .A control system in which the control action is somehow dependent on the output is known as
A. Semi closed loop system
B. Open system
B. universal motor
Q.17) Any externally introduced signal affecting the controlled output is called a
A. gain control
B. feedback
C. stimulus
D. signal
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Q.18) For open control system which of the following statements is incorrect ?
A. Errors are caused by disturbances
B. Recalibration is not required for maintaining the required quality of the output
C. Less expensive
B. charge
C. inductance
D. capacitance
C. remains unaffected
C. open
D. closed
Q.22) Which of the following should be done to make an unstable system stable ?
A. T he gain of the system should be increased
Q.23) Due to which of the following reasons excessiv e bond width in control systems should be avoided
?
A. None of the above
Q.24) The initial response when tne output is not equal to input is called
A. Either of the above
B. Dynamic response
C. Transient response
D. Error response
Q.25) As a result of introduction of negative feedback which of the following will not decrease ?
A. Distortion
B. Instability
C. Band width
D. Overall gain
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Answer Key
Q.1) The system is highly oscillatory
Q.2) positive sign
Q.3) Feedback
Q.4) stochastic control system
Q.5) Presence of non-itineraries causes malfunctioning
Q.6) Only one of the static error co-efficient has a finite non-zero value
Q.7) inductance
Q.8) increase
Q.9) input reference signal is zero
Q.10) the control action is independent of the output
Q.11) saturation in amplifying stages
Q.12) stored energy
Q.13) Field controlled D.C. motor
Q.14) Closed loop system
Q.15) reference and output
Q.16) two phase induction motor
Q.17) stimulus
Q.18) Recalibration is not required for maintaining the required quality of the output
Q.19) current
Q.20) increases by the same amount as the gain decreases
Q.21) open
Q.22) The gain of the system should be increased
Q.23) Noise is proportional to band width
Q.24) Transient response
Q.25) Band width
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