Control Systems MCQ

1. The transfer function technique is considered as inadequate under which of the following conditions ?
a) Systems having complexities and non-linearities
b) Systems having stability problems
c) Systems having multiple input dis¬turbances
(d) All of the above
Answer: All of the above
2. With feed back ____________ reduces.
a) system stability
b) system gain
c) system stability and gain
d) none of the above
Answer: system gain
3. Which of the following is the output of a thermocouple ?
a) Alternating current
b) Direct current
c) A.C. voltage
d) D.C. voltage
Answer: D.C. voltage
4. Which of the following is exhibited by Root locus diagrams ?
a) The poles of the transfer function for a set of parameter values
b) The bandwidth of the system
c) The response of a system to a step input
d) The frequency response of a system
Answer: The poles of the transfer function for a set of parameter values
5. If the gain of the critical damped system is increased it will behave as
a) oscillatory
b) critically damped
c) overdamped
d) underdamped
Answer: underdamped
6. In a control system integral error compensation _____________ steady state error
a) increases
b) minimizes
c) does not have any effect on
d)  none of the above
Answer: minimizes
7. Which of the following is electromechanical device ?
a) Induction relay
b) Thermocouple
c) LVDT
d) none of the above
Answer: LVDT
8. _________ directly converts temperature into voltage.
a) Thermocouple
b) Potentiometer
c) Gear train
d) LVDT
Answer: Thermocouple
9. A differentiator is usually not a part of a control system because it
a) reduces damping
b) reduces the gain margin
c) increases input noise
d) increases error
Answer: increases input noise
10. Which of the following can be measured byLVDT?
a) Displacement
b) Velocity
c) Acceleration
d) all of the above
Answer: all of the above
11. A.C. servomotor is basically a
a) universal motor
b) single phase induction motor
c) two phase induction motor
d) three phase induction motor
Answer: two phase induction motor
12. When the initial conditions of a system are specified to be zero it implies that the system is
a) at rest without any energy stored in it
b) working normally with reference input
c) working normally with zero reference input
d) at rest but stores energy
Answer: at rest but stores energy
13. The first order control system, which is well designed, has a
a) small bandwidth
b) negative time constant
c)large negative transfer function pole
d) none of the above
Answer: large negative transfer function pole
14. An amplidyne can give which of the following characteristics ?
a) Constant current
b) Constant voltage
c) Constant current as well as constant voltage
d) Constant current, constant voltage and constant power
Answer: Constant current, constant voltage and constant power
15. Transfer function of a system is used to calculate which of the following ?
a) The order of the system
b) The time constant
c) The output for any given input
d) The steady state gain
Answer: The output for any given input