#Sales Offer!| Get upto 25% Off:

1. Sparking at the trailing edges of the brushes in a DC machine is usually prevented by fitting

 

(a) copper gauze brushes (b) a compensating winding

(c) a compound winding (d) commutating (or inter-) poles

2.A series-excited field on a DC machine is connected

(a) so that it carries the full machine current

(b) directly across the armature terminals

(c) in series with the shunt field

(d) in parallel with the armature

3.A DC machine with compound field windings is one that

(a) has no speed or EMF variation due to field adjustment

(b) has both shunt and series fields

(c) has field windings, made of special material

(d) is never used.

4. If the resistance in series with the shunt field of a DC motor is increased in value, the motor will

(a) slow down (b) stop

(c) overheat (d) speed up

5. A starter is necessary for a DC motor because it

(a) will not rotate without one

(b) prevents the operator from receiving electric shocks (c) will draw excessive current if one were not used

(d) adds to the cost of the machine

6.A new DC generator which will not self-excite can be induced to do so by

(a) ‘flashing’ the field (b) increasing the speed

(c) using a permanent magnet (d) hitting it

Found something interesting ?

• On-time delivery guarantee
• PhD-level professional writers
• Free Plagiarism Report

• 100% money-back guarantee
• Absolute Privacy & Confidentiality
• High Quality custom-written papers

Related Model Questions

Feel free to peruse our college and university model questions. If any our our assignment tasks interests you, click to place your order. Every paper is written by our professional essay writers from scratch to avoid plagiarism. We guarantee highest quality of work besides delivering your paper on time.

Grab your Discount!

25% Coupon Code: SAVE25
get 25% !!