Routh stability method uses __________ loop transfer function.

Bode stability method uses __________ loop transfer function.

A

Open

B

Closed

C

Either A or B

D

Neither A nor B

__________ stability method uses open loop transfer function.

A

Nyquist

B

Mikhalov

C

Ruth

D

None of these

Nyquist stability criterion uses open loop frequency response characteristics.

A

True

B

False

If any term in the first column of a Routh array becomes zero, then

A

Routh criterion cannot be used to determine stability

B

Routh criterion can be used by substituting a small positive number for zero and completing the array

C

Routh criterion can be used by substituting a big positive number for zero and completing the array

D

Routh criterion can be used by substituting a small negative number for zero and complet-ing the array

A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body and S = Sum of the squares of the two semi-axes.)

A

$$\frac{{{\text{MS}}}}{3}$$

B

$$\frac{{{\text{MS}}}}{4}$$

C

$$\frac{{{\text{MS}}}}{5}$$

D

None of these

Routh test

A

Criterion provides information about the actual location of roots

B

Cannot be used to test the stability of a control system containing transportation lag

C

Criterion is not applicable to systems with polynomial characteristic equation

D

Can not determine as to how many roots of the characteristics equation have positive real roots

In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

A

$$\frac{{\text{G}}}{{1 + {\text{H}}}}$$

B

$$\frac{{\text{H}}}{{1 + {\text{G}}}}$$

C

$$\frac{{\text{G}}}{{\text{H}}}$$

D

$$\frac{{\text{H}}}{{\text{G}}}$$

Characteristic equation is the denominator of __________ loop transfer function.

A

Open

B

Closed

C

Both A & B

D

Neither A nor B

According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

A

0°

B

45°

C

90°

D

180°

What are the three important manipulations done in a for loop on a loop variable?

A

Updation, Incrementation, Initialization

B

Initialization,Testing, Updation

C

Testing, Updation, Testing

D

Initialization,Testing, Incrementation

Routh stability method uses __________ loop transfer function.

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