Question 1

has tendency to oscillate.

Accepted Answer

A)  open loop system
B)  closed loop system
C)  both (a)  and (b) 
D)  neither (a)  nor (b)  B

Question 2

A good control system has all the following features except

Accepted Answer

A)  good stability
B)  slow response
C)  good accuracy
D)  sufficient power handling capacity B

Question 3

The initial response when tne output is not equal to input is called

Accepted Answer

A)  transient response
B)  error response
C)  dynamic response
D)  either of the above A

Question 4

is a part of the human temperature control system.

Accepted Answer

A)  digestive system
B)  perspiration system
C)  ear
D)  leg movement

Question 5

Which of the following devices are commonly used as error detectors in instruments ?

Accepted Answer

A)  vernistats
B)  microsyns
C)  resolvers
D)  any of the above

Question 6

A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?

Accepted Answer

A)  clutch
B)  eyes
C)  needle of the speedometer
D)  steering wheel

Question 7

A control system working under unknown random actions is called

Accepted Answer

A)  computer control system
B)  digital data system
C)  stochastic control system
D)  adaptive control system

Question 8

Regenerative feedback implies feedback with

Accepted Answer

A)  oscillations
B)  step input
C)  negative sign
D)  positive sign

Question 9

is an open loop control system.

Accepted Answer

A)  ward leonard control
B)  field controlled d.c. motor
C)  stroboscope
D)  metadyne

Question 10

Which of the following statements is not necessarily correct for open control system ?

Accepted Answer

A)  input command is the sole factor responsible for providing the control action
B)  presence of non-linearities causes malfunctioning
C)  less expensive
D)  generally free from problems of non-linearities

Question 11

In an open loop control system

Accepted Answer

A)  output is independent of control input
B)  output is dependent on control input
C)  only system parameters have effect on the control output
D)  none of the above

Question 12

increases the steady state accuracy.

Accepted Answer

A)  integrator
B)  differentiator
C)  phase lead compensator
D)  phase lag compensator

Question 13

In closed loop control system, with positive value of feedback gain the overall gain of the system will

Accepted Answer

A)  decrease
B)  increase
C)  be unaffected
D)  any of the above

Question 14

A closed loop system is distinguished from open loop system by which of the following ?

Accepted Answer

A)  servomechanism
B)  feedback
C)  output pattern
D)  input pattern

Question 15

For open control system which of the following statements is incorrect ?

Accepted Answer

A)  less expensive
B)  recalibration is not required for maintaining the required quality of the output
C)  construction is simple and maintenance easy
D)  errors are caused by disturbances

Question 16

Which of the following is an open loop control system ?

Accepted Answer

A)  field controlled d.c. motor
B)  ward leonard control
C)  metadyne
D)  stroboscope

Question 17

By which of the following the control action is determined when a man walks along a path ?

Accepted Answer

A)  brain
B)  hands
C)  legs
D)  eyes

Question 18

An automatic toaster is a ______ loop control system.

Accepted Answer

A)  open
B)  closed
C)  partially closed
D)  any of the above

Question 19

In open loop system

Accepted Answer

A)  the control action depends on the size of the system
B)  the control action depends on system variables
C)  the control action depends on the input signal
D)  the control action is independent of the output

Question 20

As a result of introduction of negative feedback which of the following will not decrease ?

Accepted Answer

A)  band width
B)  overall gain
C)  distortion
D)  instability

Exam 1: Control Systems and Feedback Loops