Question with Answer Electrical engineering

1. Three identical impedance are connected in delta to 3 phase supply of 400 V. The line current is 34.65 A and the total power taken is 14.4 kW. What is the resistance of the load in each phase ?
(1) 20         
(2) 16
(3) 12          
(4) 10             
 उत्तर (3)
2. In three phase 400 volt, 50 Hz supply, the phase to neutral voltage is
(1) 220 Volt    
(2) 230Volt
(3) 440Volt      
(4) 150Volt              
उत्तर (2)   
3. Each branch of Y-connected load has resistance to 10𝛺 The resistance of each branch of an equivalent  𝛥-connected load will be
(1) 30 𝛺        
(2) 100 𝛺
(3) 110 𝛺       
(4) None of these              
उत्तर (1)
4. In 3 phase system with what degree there is a phase displacement between different phases ?
(1) 360°          
(2) 220°
(3) 180°        
(4) 120°             
उत्तर (4)
5. Which three phase system does not contain neutral ?
(1) Star      
(2) Delta 
(3) Both do not contain (Star and Delta) 
(4) Both (Star and Delta) Contain                
उत्तर (2)
6. In a three phase four-wire system the line voltage is 400 V and a load of 10 kW is connected between line conductor and the neutral. The current through the load is :
(1) 40 A        
(2) 25A
(3) 43.5 A       
(4) 14.45 A           
उत्तर (3)
7. 10. To calculate the power factor which of the following is odd one :
(1) True power / apparent power  
(2) P/VI
(3) R/Z        
(4) V/I                
उत्तर (4)
8. Unit of reactive power is :
(1) Watt        
(2) Kiol watt 
(3) VAR          
(4) Volt ampere                
उत्तर (3)
9. When XL is equal to XC :
(1)  Z = R        
(2) Z = XC
(3) Z = XL          
(4) None of These                
उत्तर (1)
10. At resonance , inductive reactance is equal :
(1) Resistance        
(2) Capacitance
(3) Capacitive Reactance        
(4)  Inductance             
उत्तर (3)