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1663.

Assertion A: In general, circulation of the magnetic field intensity is zero.
Reason R: Vector source of circulation is the current density.
a. Both A and R are true and R is the correct explanation of A
b. Both A and R are true but R is NOT a correct explanation of A
c. A is true but R is false
d. A is false but R is true

asked in Electrical Paper-1, 1997

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1664.

Which one of the following systems is open-loop?
a. The respiratory system of man
b. A system for controlling the movement of the slide of a copying milling machine.
c. A thermostatic control
d. Traffic light control

asked in Electrical Paper-1, 1997

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1665.

Consider the following state equations for a discrete system:

The system given above is
a. Controllable and observable
b. Uncontrollable and unobservable
c. Uncontrollable and observable
d. Controllable and unobservable

asked in Electrical Paper-1, 1997

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1666.

Which one of the following pairs of phase plane diagram and types of singularities is NOT correctly matched?

asked in Electrical Paper-1, 1997

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1667.

A non-linear control system is described by the equation d²x/dt² + sinx=0
The type of singularity at x =π and dx/dt = 0 is:
a. Centre
b. Stable focus
c. Saddle point
d. Stable node

asked in Electrical Paper-1, 1997

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1668.

Four speed-torque curves (labelled I, II, III and IV) are shown in the given figure. That of an ac servomotor will be as in the curve labelled

a. I
b. II
c. III
d. IV

asked in Electrical Paper-1, 1997

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