U21EC101-IEEE-QUIZ

1. The elements which are not capable of delivering energy by its own are known as

• (a) Unilateral elements   

   

     

     

• (b) Nonlinear elements

•  (c) Passive elements  

• (d) Active elements

1. Choose the active elements -----

• a. Resistor

• b. Transistor/ DC source

• c. Inductor

• D.Capacitor

3.What is the unit of electrical energy?

• (a) kW                   

                

• (b) KJ

• (c) kWh  

• (d) Kw/h

4. Direction of rotation of the motor is determined by ____________

• (a)Faraday’s law
  
  
  

• (b) Lenz’s law

• (c) Coulomb’s law

• (d) Fleming’s left-hand rule

5. What are the materials used for brushes in dc machines?
   
   
   

• a) Iron

• b) Carbon

• c) Aluminum
  

• d) Steel

6.The function of Commutator in DC motor is -------

• a) Collecting of current

• b) Reduce losses

• c)     Increase efficiency

• d)    Convert AC armature current in to DC

7.The armature of DC motor is laminated to ____________

• a) To reduce mass
  
  
  

• b) To reduce hysteresis loss

• c) To reduce eddy current loss

• d) To reduce inductance

8.Which of the following DC motor has approximately constant speed?

• (A)   Series motor

• (B)   Shunt motor

• (C)   Compound motor

• (D)   Cumulatively compound motor

9. Which of the following does not change in transformer?

• (A)   Voltage

• (B)   Current

• (C)   Frequency

• (D)   Magnetic flux

10. What is the working principle of a Transformer?
    
    
    

• a) Transformer works on the principle of self induction
  

• 
  b) Transformer works on the principle of mutual induction

• c) Transformer works on the principle of ampere law

• d) Transformer works on the principle of coulomb law