Quiz
BSNL TTA ONLINE TEST - 3 Control System
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Questions in this quiz (30)
1 The transfer function for tachometer E(S)/θ(S) is
- AK
- BKS
- CK/S
- DKS²
2Which of the following id the electrical analogous element for displacement in force-voltage analogy?
- Aflux
- Bvoltage
- Ccharge
- Dcurrent
3Which of the following is/are the characteristics of negative feedback control system?
- ALow sensitivity to parameter variations
- BReduction in gain at the expense of better stability
- CRejection of disturbance signals
- Dall of the above
4Which of the following combinations is/are correct electrical analogous elements in force-current analogy?
- AVelocity (v) ----------------- Voltage (V)
- BForce (f) --------------------- Current (i)
- CSpring element (K) --------- Inverse inductance (1/L)
- Dall of the above
5Lowest critical frequency is due to pole and it may be present origin or nearer to origin, then it is which type of network?
- ALC
- BRL
- CRC
- DRLC
6 Lowest critical frequency is due to zero and it may be present origin or nearer to origin, then it is which type of network ?
- ALC
- BRC
- CRLC
- DRL
7Poles and zeros are arranged alternatively on negative real axis, then type of network is/are
- ALC network
- BRC network
- CRL network
- DRL & RC
8Advantages of open loop system is/are?
- Asimple and economical
- Baccurate
- Creliable
- Dall of the above
9Which of the following are the disadvantages of a closed loop control system?
- Areduces the overall gain
- Bcomplex and costly
- Coscillatory response
- Dall of the above
10Force balancing equation of a dash-pot elements is ( where x = displacement)
- AB d²x/dt²
- BB dx/dt
- CB *x
- Dnone of the above
11What is the order of closed loop system for the plant transfer function G(s) = k/s²(1+Ts) and with unity feedback
- A3
- B2
- C1
- D0
12A second order control system is defined by the following equation:
4 d²c(t)/dt² + 8 dc(t)/dt + 16 c(t) = 16 u(t)
The damping ratio and natural frequency for this system are respectively- A0.25 and 2 rad/s
- B0.25 and 4 rad/s
- C0.50 and 2 rad/s
- D0.50 and 4 rad/s
13The steady state error due to ramp input for a type two system is equal to
- Azero
- Binfinite
- Cnon zero number
- Dconstant
14Differentiation of parabolic response is a -------------- response?
- Aparabolic
- Bramp
- Cstep
- Dimpulse
15Weighting function is in terms of -----------------
- ALaplace transforms of step response
- BLaplace transforms of ramp response
- CLaplace transforms of parabolic response
- DLaplace transforms of impulse response
16The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its closed loop transfer function is
- A(2s+1)/s²
- B(2s+1)/(s+1)²
- C(2s+2)/(s+1)²
- D(2s+2)/s²
17Lead compensator is used to improve ------------------
- Atransient response
- Bsteady state response
- Cboth 1 and 2
- Dnone of the above
18Adding a pole to a system transfer function in terms of compensator represents a --------------- compensator ?
- ALead
- BLag
- CLead-Lag
- DLag-lead
19A linear time invariant system, initially at rest when subjected to a unit step input gave response c(t) = te-t (t ≥ 0). The transfer function of the system is
- A1/s(s+1)²
- B(s+1)²/s
- Cs/(s+1)
- Ds/(s+1)²
20Given the transfer function G(s) = 121/(s² + 13.2s + 121) of a system. Which of the following characteristics does it have?
- AOver damped
- BCritical damped
- CUnder damped
- Dany of the above
21For type 1 system with parabolic input, the steady state error is
- Azero
- Bfinite constant
- Cinfinite
- Dindeterminate
22Time taken for the response to raise from zero to 100 % for very first time is called
- Arise time.
- Bsettling time.
- Cdelay time.
- Dpeak time.
23 Lead network is used to improve
- Aimprove transient response.
- Bincrease bandwidth.
- Cimprove steady state response.
- Dboth A and B.
24Type and order of transfer function G ( s ) = K / {s( s + 2 )}
- A1, 2.
- B2, 1.
- C0, 2.
- D1, 1.
25The magnitude condition for root locus is ............
- A|G(s)H(s)| = 0
- B|G(s)H(s)| = 2
- C|G(s)H(s)| = 1
- D|G(s)H(s)| = ∞
26The angle condition is used for checking whether any point lies on root locus or not is...........
- A± (2q + 1) 180°
- B± (2q) 180°
- C± (2q + 1) 360°
- D± (2q) 360°
27Which of the following statements is/are true?
- ACentroid may be a part of root locus
- BCentroid may not be a part of root locus
- Cboth 1 and 2
- Dnether 1 nor 2
28Transfer function of a control system depends on
- Ainitial conditions of input and output
- Bsystem parameters alone
- Cnature of output
- Dnature of input
29Negative feedback in a closed loop control system
- Areduce gain
- Bimproves disturbance rejection
- Creduce sensitivity to parameter variation
- Dall of the above
30 The magnitude of a transfer function G(jω)H(jω) at gain cross over frequency is
- A0
- B1
- Cinfinity
- Dany of the above
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- Subject : Control System Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
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