NABTEB

Define the following terms as applied to electrical machines. i. Generator ii. Motor – NABTEB QUESTION

(i) Generator: Converts mechanical energy to electrical energy. It operates by the magnetic effects of current. (ii) Motor: Converts electrical…

5 years ago

State the advantages if trunking over ducting system. – NABTEB QUESTION

Advantages of trunking over ducting system are: (i) It serves as earth continuity conducts. (ii) It has segregations which accommodate…

5 years ago

Explain the following terms as applied to industrial installation. (i) Duct. (ii) Trunking. – NABTEB QUESTION

(i) Duct: A closed passage – way formed underground or in a structure and intended to receive one or more…

5 years ago

Define an armature – NABTEB QUESTION

Armature is the rotating part of a d.c machine.

5 years ago

Explain the function of the following as applied to a d.c. machine. i. Yoke ii. Pulley – NABTEB QUESTION

i. Yoke is a frame in which the field coils are fixed to make magnetic field of flux for the…

5 years ago

State four causes of arcing at the brushes on a d.c. motor – NABTEB QUESTION

(i) Worn out brush ii. Wrong position of brush iii. Loose spring iv. Overloaded mechanical brush v. Worn out commutator

5 years ago

State procedure of dismantling a D.C. motor – NABTEB QUESTION

a. Remove the pulley coupling with extractor b. Disconnect the wires to the brush holder terminals, from the brushes and…

5 years ago

List four causes of overheated bearings. – NABTEB QUESTION

i. cracked balls in the bearing ii. lack of lubricant iii. Dirty lubricant iv. overload pulley or coupling

5 years ago

State the functions of the following tools and equipment used in an electrical winding workshop. – NABTEB QUESTION

a. Mallet: used for shaping winding or coils wound and placed in the slots of machines. b. Workbench: is a…

5 years ago

Explain the statutory regulations regarding the use of the following winding materials/equipment: i. setting of winding machine ii. Liquid varnish iii. Oven – NABTEB QUESTION

Answer i. setting of winding machine a. Steady speed should be maintained to allow smooth and equal tension on the…

5 years ago