Deck 2: Control Systems and Analogies

Question 1

Zero initial condition for a system means

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

Answer 1

system is at rest and no energy is stored in any of its components

Question 2

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 2

the output for any given input

Question 3

The band width, in a feedback amplifier.

A)remains unaffected
B)decreases by the same amount as the gain increase
C)increases by the sane saaaajajt as the gain decrease
D)decreases by the same amount as the gain decrease

Answer 3

increases by the sane saaaajajt as the gain decrease

Question 4

load disturbances depend ?

A)frequency
B)loop gain
C)forward gain
D)all of the above

Question 5

The transient response, with feedback system,

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

Question 6

The second derivative input signals modify which of the following ?

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

Question 7

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

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

Question 8

Due to which of the following reasons excessive bond width in control systems should be avoided ?

A)it leads to slow speed of response
B)it leads to low relative stability
C)noise is proportional to band width
D)none of the above

Question 9

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

A)underdamping
B)overdamping
C)poor stability at reduced values of open loop gain
D)low-level oscillations

Question 10

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

A)error detector
B)final control element
C)sensor
D)oscillator

Question 11

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

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

Question 12

A controller, essentially, is a

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

Question 13

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

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

Question 14

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

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

Question 15

In electrical-pneumatic system analogy the current is considered analogous to

A)velocity
B)pressure
C)air flow
D)air flow rate

Question 16

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

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

Question 17

The viscous friction co-efficient, in force-voltage analogy, is analogous to

A)charge
B)resistance
C)reciprocal of inductance
D)reciprocal of conductance

Question 18

In force-voltage analogy, velocity is analogous to

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

Question 19

In thermal-electrical analogy charge is considered analogous to

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

Question 20

Mass, in force-voltage analogy, is analogous to

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

Question 21

The transient response of a system is mainly due to

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

Question 22

signal will become zero when the feedback signal and reference signs are equal.

A)input
B)actuating
C)feedback
D)reference

Question 23

The transfer function is applicable to which of the following ?

A)linear and time-in variant systems
B)linear and time-variant systems
C)linear systems
D)non-linear systems

Question 24

From which of the following transfer function can be obtained ?

A)signal flow graph
B)analogous table
C)output-input ratio
D)standard block system