Question Paper Electrical Engineering

1. What would be the value of pole pitch it there are 80 conductors and 8 poles ?
(1) 640       
(2) 64
(3)।80      
(4) 10.               
Ans  (4)
2. The generator which gives de supply to the rotor is called :
(1) Converter         
(2) Exciter
(3) Inverter       
(4) Rectifier             
Ans (2)
3. The field coils of DC generator are generally made up of :
(1) Mica         
(2 ) Copper 
(3) Cast Iron       
(4) Carbon                 
Ans  (2)
4. The highest rating transformer is likely to found application in :
(1) Distribution         
(2) Transmission 
(3) Generator           
(4) Sub Station .               
Ans  (3)
5. The smallest amongst the given transformers is :
(1) 2 KVA, 500Hz          
(2) 2kVA, 200 Hz
(3) kVA, 50 Hz           
(4) 2 kVA, 700 Hz.             
Ans  (4)
6. 9. The angle between induced emf and terminal voltage on no-load for a single phase alternator is-
(1) 180°       
(2) 90°
(3)0°               
(4) 270°                 
Ans  (3)
7. Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch to :
(1) 2/3       
(2)4/5
(3) 5/6        
(4) 6/7.              
Ans  (3)
8.  The frequency of voltage generated in a 4-pole alternator rotating at 1800 r.p.m. is
(1) 25 Hz      
(2) 30  Hz
(3)  60Hz        
(4)  None of these                 
Ans  (3)
9. Which one of the following methods gives voltage regulation higher than actual value in an alternator ?
(1) ZPE method       
(2) mmf method
(3) emf method         
(4)ASA method             
Ans  (3)
10. A direct on-line starter is used for starting motors up to :
(1) 5 hp        
(2) 10 hp
(3) 20 hp        
(4) 40 hp                  
Ans (1)