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ESE EE : Electrical Machines Champion Quiz 3
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Question 1
The maximum efficiency occurs in a separately excited d.c. generator when the terminal voltage is 220 V and the induced emf is 240 V, the stray losses, if the armature resistance is 0.2
, will be
, will be Question 2
The air-gap between the yoke and armature in a dc motor is kept small
Question 3
Wave winding is employed in a d.c. machine of
Question 4
Match List-I (Characteristic) with List-II (Relation) and select the correct answer using the code given below the lists :
List-I
A) Open circuit characteristics
B) Internal characteristics
C) External characteristics
D) Load saturation curve
List-II
1)
2)
3)
4)
List-I
A) Open circuit characteristics
B) Internal characteristics
C) External characteristics
D) Load saturation curve
List-II
1)
2)
3)
4)
Question 5
Match List-I (DC motor) with List-II (Characteristic) and select the correct answer using the code given below the lists :
List-I
A) Cumulatively compound motor
B) Differentially compound motor
C) Series motor
D) Shunt motor
List-II
1) Fairly constant speed irrespective of the load
2) It may start in reverse direction
3) Define no-load speed
4) Is never started without load
List-I
A) Cumulatively compound motor
B) Differentially compound motor
C) Series motor
D) Shunt motor
List-II
1) Fairly constant speed irrespective of the load
2) It may start in reverse direction
3) Define no-load speed
4) Is never started without load
Question 6
A 6-pole lap wound d.c. machine armature has 720 conductors and it draws 50 A from supply mains. What is the flux distribution produced by the armature reaction per pole?
Question 7
In a d.c. compound generator, "flat-compound" characteristic, required for certain applications, may be obtained by connecting a variable resistance;
Question 8
The speed control of dc stunt motor in both directions can be obtained by
Question 9
The drawbacks of ‘Armature Resistance Control’ method of speed control a dc motor are
1) A large amount of power is lost in the external resistance R.
2) This method gives the speed below normal values.
3) For a specified value of R, speed reduction is not constant. It varies with motor load.
Which of the above statements are correct?
Question 10
Statement (I): The direct on-line (DOL) starter is used to start a small dc motor.
Statement (II): DOL starter limits initial current drawn by the armature circuit.
Statement (II): DOL starter limits initial current drawn by the armature circuit.
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