ELECTRICAL MACHINCES MCQS SET 02

ELECTRICAL MACHINCES MCQS SET 02

1. Induction motor Stator Voltage control method is used for
A) Speed control      

B) Frequency Control
C) Both A&B                 

D) None of these
ANSWER:A
 

2.Three phase Induction motor stator is of
A) 3-phase supply         

B) 1-phase Supply
C) Both A&B           

D) None of these
ANSWER:A
 

3. Induction Motor operates on the principle of
A) Induction              

B) Conduction
C) Both A&B        

D) None of these
ANSWER:A
 

4. Motor is a machine which converts
A) Mechanical Energy into Electrical Energy
B) Electrical Energy into Mechanical Energy
C) Both A&B        
D) None of these
ANSWER:B
 

5. Generator is a machine which converts
A) Mechanical Energy into Electrical Energy
B) Electrical Energy into Mechanical Energy
C) Both A&B          
D) None of these
ANSWER:A
 

6. Efficiency means
A) Output Power /Input power
B)Input Power/Output Power
C) Both A&B            
D) None of these
ANSWER:A
 

7. Core Losses are
A) Hysteresis loss           

B) Eddy Current Loss
C) Both A&B            

D) None of these
ANSWER:C
 

8. Copper Losses are
A) I2R Losess     
B) Constant Losess        
C) Both A&B
D) None of these
ANSWER:A
 

9. Mechanical Losses are
A)core losses          

B) Friction & Windage losses
C) Both A&B             

D) None of these
ANSWER:B
 

10.External Resistance is observed in
A) Squirrel Cage Induction Motor
B) Slip Ring Induction Motor
C) Both A&B                  

D) None of these
ANSWER:B
 

11. What is the synchronous speed when F=60Hz, P=6
A)1000 RPM            

B) 1100 RPM   
C) 1200 RPM           

D)1300RPM
ANSWER:C
 

12. What is slip when Ns=1200RPM , Nr=1000RPM
A)0.15       

B)0.16          

C)0.17             

D) 0.18
ANSWER:B
 

13. What is the value of frequency when Ns=1000 RPM , P=6
A)30Hz         

B)40Hz             

C)50Hz         

D)60Hz
ANSWER:C
 

14. What is the value of Nr when S=0.6, Ns=1000RPM
A)400 RPM       

B)500 RPM      
C)600 RPM        

D)700RPM
ANSWER:A
 

15. Slip When Nr=Ns
A)1                

B)0              

C)0.5                

D)0.4
ANSWER:B