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The de motor, which can provide zero speed regulation at full load without any controller is :
(A) | series ൯) shunt

(C) cumulative compound (1) differential compound

The series field winding terminals of a differentially compounded de generator are externally
shorted. Then the output terminal voltage will :

(ಸಿ) increase (B) decrease

(C) reduce to residual voltage (D) become zero

A 220V de motor produces 40 Nm torque at an armature current is 10 A. When the armature
current is 15 A, the developed torque will be

(A) 49Nm (B) 60Nm

(C) 90Nm (D) 135 Nm
An alternator has 12 slots per pole and the first coil lies in slot 1 and 11. Then the pitch
factor for the winding is :

(A) cos 0° (8) 008 159

(೮) cos 22.59 (2) 00830
An alternator generates 400V, 50 Hz when excited with 5A field current. Assuming the

magnetic circuit is unsaturated, the generated voltage when operating at 40 Hz and 4A field
current is :

(A) 400 ४ (8) 80%
(0. 256% (0) 200%
A three phase, salient pole synchronous generator is connected to an infinite bus. It is

operated at half full load and under excited condition. Then the operation of the generator
will be at :

(A) close to unity power factor (B) low lagging power factor

(C) low leading power factor (D) close to zero power factor

Distributed winding and short chording employed in AC machines will result in :
(A) increase in emf and reduction in harmonics
(B) reduction in emf and increase in harmonics
(C) increase in both emf and harmonics

(D) reduction in both emf and harmonics

131/2023 12 A