Electric motors Quiz 2



KLE Dr. M. S. Sheshgiri College of Engineering and Technology, Belagavi

Department of Electrical And Electronics Engineering

QUIZ -2

Code:    15EE44                   Subject: Electric motors                                  Semester: IV                       
Date:      03/02/2018            Staff: Prof. Abhinay Gupta
1.    The function of ____ in dc generator is to collect current from commutator and deliver it to external circuit
 Dummy Coils
 Brushes
 Equalizer rings
 End rings
2.    In DC Motor speeds above the rated speed can be attained by varying which of the following winding current
 Either Filed winding or Armature winding
 Armature winding
 Field Winding
3.    The main advantage of dc motors compared to ac motors are: (Choose multiple answers)
 High Starting Torque
 Speed Control
 Less Maintenance
 Low Cost
4.    The emf produced in dc generator is ___ induced emf:
 Dynamically
 Statically
 Electrostatically
 Magnetically









5.    In DC Generator which of the following device plays a key role in providing dc current:
 Equalizer rings
 Dummy Coils
 Brushes
 Commutator
6.    The Current flowing through the armature of the dc motor is:
 Pulsating
 DC
 None of the Answers
 AC
7.    The direction of rotation of dc series motor can be reversed by interchanging ___ terminals:
 Armature
 Field
 Supply
 Either Armature or Field

8.    DC Series Motor should always be started with load connected to it:
 False
 True
9.     Armature of the dc machine is laminated to reduce which of the following:
 Hysteresis Loss
 Both Eddy Current Loss and Hysteresis Loss
 Eddy Current Loss
 Copper Loss
10.  Which of the following DC Motor is best suited for speed control applications such as in rolling mills and paper mills:
 DC Compound Motor
 DC Shunt Motor
 DC Series Motor
 DC Differential Compound Motor
11.  Starter is used in DC Motor for which of the following purpose:
 Reduce Starting Current
 Improving Back EMF
 Improving Starting Torque
 Improve efficiency
12.  The power rating that is indicated on name plate of any motor is:
 Power drawn in kVA
 Output Power of Shaft
 Net Power
 Gross Power
13.  If the flux of the dc motor attains zero, its speed will become:
 Infinite
 Zero
 Full load speed
 Synchronous speed
14.  The rotating part of the dc machine is known as:
 Armature
 Field
 Rotor
 Stator
15.  Which of the following DC Motor is employed in high traction applications:
 DC Compound Motor
 DC Series Motor
 DC Differential Compound Motor
 DC Shunt Motor







Comments

  1. VIDYUT TARANG18 February 2018 at 02:38

    Quiz 2 on Electric motors is updated.
    solutions will be uploaded later.

    ReplyDelete
  2. VIDYUT TARANG18 February 2018 at 02:51

    https://drive.google.com/drive/folders/1e6yLyR6QvU6FnSCF2mbeLh1nQFrrmADX?usp=sharing

    follow the link to download the file.

    Good luck.

    ReplyDelete

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