CONTROL SYSTEM MCQS SET 37

CONTROL SYSTEM MCQS SET 37

1. For a type one system, the steady – state error due to step input is equal to
a) Infinite             b) Zero           c) 0.25              d) 0.5
Answer: b

2. The equation 2s4+s3+3s2+5s+10=0 has roots in the left half of s–plane:
a) One            b) Two         c) Three      d) Four
Answer: b

3. If the Nyquist plot of the loop transfer function G (s)H (s) of a closed-loop system encloses the (1, j0) point in the G (s)H (s) plane, the gain margin of the system is
a) Zero             b) Greater than zero         c) Less than zero      d) Infinity
Answer: c

4. Consider the function F (s) =5/s (s2+s+2) , where F (s) is the Laplace transform f (t). Then the final value theorem is equal to
a) 5             b) 5/2               c) Zero            d) Infinity
Answer: b
5. The transfer function of a phase-lead controller is given by
a) (1+aTs)/(1+Ts) , a>1 T>0            b) (1+aTs)/(1+Ts) , a<1 T>0
c) (1-aTs)/(1+Ts) , a>1 T>0              d) (1±Ts)/(1+Ts) , a<1 T>0
Answer: a

6. If the system matrix of a linear time invariant continuous system is given by
Its characteristic equation is given by:
a) s2+5s+3=0              b) s2-3s-5=0              c) s2+3s+5=0         

d) s2+s+2=0

7. Given a unity feedback control system with G (s) = K/s(s+4), the value of K for which the damping ratio is 0.5.
a) 1         b) 16          c) 64                d) 32
Answer: b

8. The LVDT is used in the measurement of:
a) Displacement          b) Acceleration           c) Velocity         d) Humidity
Answer:a

9. A system with gain margin close to unity and phase margin close to zero is :
a) Highly stable           b) Oscillatory    c) Relatively stable      d) Unstable
Answer: c