Electrical machine design. Part – 1

1. In lap winding no. Of brushes is always _____ the no. Of pole

A. Double

B. Same as

C. Half

D. None of the above

2. The number of parallel path for 4 pole duplex lap winding is

A. 4                       

B. 8

C. 6

D. 2

3. A 4 pole generator with 16 coils has two layer lap winding the pole pitch is

A. 32

B. 16

C. 8

D. 4

4. The frame of an induction motor is usually made of

A. Silicon steel

B. Cast iron

C. Aluminum

D. Bronze

5. The armature core of a D.C. generator is usually made of

A. Silicon steel

B. Copper

C. Nonferrous material

D. Cast iron

6. Lubricant used for ball bearing is usually

A. Graphite

B. Grease

C. Mineral oil

D. Molasses

7. Material used for construction of transformer core is usually

A. Wood

B. Copper

C. Aluminium

D. Silicon steel

8. Size of a high speed motor as compared to low speed motor for the same h.p. Will be

A. Bigger

B. Smaller

C. Same

D. Any of the above

9. The resistance of armature winding depends on

A. Length of conductor

B. Cross-section area of the conductor

C. Number of conductors

D. All of the above

10. Lamination of core are generally made of

A. Case iron

B. Carbon

C. Silicon steel

D. Stainless steel