Which of the following is an open loop control system?

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

Correct Answer : Option (D) :   Field controlled D.C. motor

Explanation : Open loop control systems are the systems that have no feedback and cannot be used to obtain the desired response and field controlled system is an open loop control system.

Recently Updated in Automatic Control Systems Questions
For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)
A)
is +90°
B)
is -90°
C)
depends on the damping factor
D)
None of the above

Correct Answer :   is -90°

The response to sinusoidal excitation can be found by
A)
setting s = jω in the network function
B)
setting s = -jω in the network function
C)
taking inverse transform of network function
D)
None of the above

Correct Answer :   setting s = jω in the network function

The resolution of a wire wound potentiometer is about
A)
5%
B)
1%
C)
0.1%
D)
0.001%

Correct Answer :   0.1%

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