Question 1

A controller, essentially, is a

Accepted Answer

A)  sensor
B)  clipper
C)  comparator
D)  amplifier C

Question 2

In force-voltage analogy, velocity is analogous to

Accepted Answer

A)  current
B)  charge
C)  inductance
D)  capacitance A

Question 3

The second derivative input signals modify which of the following ?

Accepted Answer

A)  The time constant of the system
B)  Damping of the system
C)  The gain of the system
D)  The time constant and suppress the oscillations D

Question 4

Mass, in force-voltage analogy, is analogous to

Accepted Answer

A)  charge
B)  current
C)  inductance
D)  resistance

Question 5

In liquid level and electrical system analogy, voltage is considered analogous to

Accepted Answer

A)  head
B)  liquid flow
C)  liquid flow rate
D)  none of the above

Question 6

The temperature, under thermal and electrical system analogy, is considered analogous to

Accepted Answer

A)  voltage
B)  current
C)  capacitance
D)  charge

Question 7

is an open loop control system.

Accepted Answer

A)  Ward Leonard control
B)  Field controlled D.C. motor
C)  Stroboscope
D)  Metadyne

Question 8

The capacitance, in force-current analogy, is analogous to

Accepted Answer

A)  momentum
B)  velocity
C)  displacement
D)  mass

Question 9

A control system with excessive noise, is likely to suffer from

Accepted Answer

A)  saturation in amplifying stages
B)  loss of gain
C)  vibrations
D)  oscillations

Question 10

Transfer function of a system is used to calculate which of the following ?

Accepted Answer

A)  The order of the system
B)  The time constant
C)  The output for any given input
D)  The steady state gain

Question 11

In a control system the output of the controller is given to

Accepted Answer

A)  final control element
B)  amplifier
C)  comparator
D)  sensor

Question 12

The transient response of a system is mainly due to

Accepted Answer

A)  inertia forces
B)  internal forces
C)  stored energy
D)  friction

Question 13

On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?

Accepted Answer

A)  Frequency
B)  Loop gain
C)  Forward gain
D)  All of the above

Question 14

Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?

Accepted Answer

A)  The system is relatively stable
B)  The system is highly stable
C)  The system is highly oscillatory
D)  None of the above

Question 15

The transient response, with feedback system,

Accepted Answer

A)  rises slowly
B)  rises quickly
C)  decays slowly
D)  decays quickly

Question 16

In a stable control system backlash can cause which of the following ?

Accepted Answer

A)  Underdamping
B)  Overdamping
C)  Poor stability at reduced values of open loop gain
D)  Low-level oscillations

Question 17

In thermal-electrical analogy charge is considered analogous to

Accepted Answer

A)  heat flow
B)  reciprocal of heat flow
C)  reciprocal of temperature
D)  temperature

Question 18

In an automatic control system which of the following elements is not used ?

Accepted Answer

A)  Error detector
B)  Final control element
C)  Sensor
D)  Oscillator

Question 19

Which of the following statements is correct for any closed loop system ?

Accepted Answer

A)  All the co-efficients can have zero value
B)  All the co-efficients are always non-zero
C)  Only one of the static error co-efficients has a finite non-zero value
D)  None of the above

Question 20

Zero initial condition for a system means

Accepted Answer

A)  input reference signal is zero
B)  zero stored energy
C)  ne initial movement of moving parts
D)  system is at rest and no energy is stored in any of its components

Exam 2: Control Systems and Analogy Analogies