Hi friends, this is post about objectives of electrical engineering with emphasis on dc motor check out and comment...
1) In case of a conductively compensated dc series motor, the compensating winding is provided
A) in series with the armature winding
B) in parallel with the armature winding
C) in parallel with the field winding
D) as a separate unit
Ans:A
2) If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed is
A) 115 V
B) 200 V
C) 230 V
D) 460 V
Ans:A
3) The direction of rotation of a dc compound motor can be reversed by interchanging
................ connections
A) armature
B) series field
C) shunt field
D) armature and series field both
Ans:A
4) Torque developed in a dc motor depends upon
A) magnetic field
B) current flowing through the armature conductors
C) active length of the conductors
D) number of armature conductors
E) radius of armature
F) all of these factors
Ans:F
5) Torque developed by the armature of a dc motor is proportional to which one of the following?
A) (Back emf) ✕ (Armature current)
B) (Magnetic flux per pole) ✕ (Armature current)
C) (Back emf) ✕ (Magnetic flux per pole)
D) (Back emf) / (Magnetic flux per pole)
Ans:B
6) The efficiency of a dc motor when developing maximum power will be about
A) 100 %
B) 50 %
C) less than 50 %
D) more than 50 %
Ans:C
7) The horse power obtained from the motor shaft is called the
A) IHP
B) BHP
C) useful output
D) none of these
Ans:B
8) The torque speed characteristics of a dc shunt motor is
A) a rectangular hyperbola
B) a drooping straight line
C) a parabola
D) none of the above
Ans:B
9) A dc series motor develops a torque of 20 Nm at 3A of load current. If the current is increased to 6A, the torque developed will be
A) 10 Nm
B) 20 Nm
C) 80 Nm
D) 40 Nm
Ans:C
10) In a dc series motor, the torque developed is
A) inversely proportional to armature current
B) directly proportional to armature current
C) proportional to the square of armature current
D) proportional to the square root of armature current
Ans:C
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1) In case of a conductively compensated dc series motor, the compensating winding is provided
A) in series with the armature winding
B) in parallel with the armature winding
C) in parallel with the field winding
D) as a separate unit
Ans:A
2) If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed is
A) 115 V
B) 200 V
C) 230 V
D) 460 V
Ans:A
3) The direction of rotation of a dc compound motor can be reversed by interchanging
................ connections
A) armature
B) series field
C) shunt field
D) armature and series field both
Ans:A
4) Torque developed in a dc motor depends upon
A) magnetic field
B) current flowing through the armature conductors
C) active length of the conductors
D) number of armature conductors
E) radius of armature
F) all of these factors
Ans:F
5) Torque developed by the armature of a dc motor is proportional to which one of the following?
A) (Back emf) ✕ (Armature current)
B) (Magnetic flux per pole) ✕ (Armature current)
C) (Back emf) ✕ (Magnetic flux per pole)
D) (Back emf) / (Magnetic flux per pole)
Ans:B
6) The efficiency of a dc motor when developing maximum power will be about
A) 100 %
B) 50 %
C) less than 50 %
D) more than 50 %
Ans:C
7) The horse power obtained from the motor shaft is called the
A) IHP
B) BHP
C) useful output
D) none of these
Ans:B
8) The torque speed characteristics of a dc shunt motor is
A) a rectangular hyperbola
B) a drooping straight line
C) a parabola
D) none of the above
Ans:B
9) A dc series motor develops a torque of 20 Nm at 3A of load current. If the current is increased to 6A, the torque developed will be
A) 10 Nm
B) 20 Nm
C) 80 Nm
D) 40 Nm
Ans:C
10) In a dc series motor, the torque developed is
A) inversely proportional to armature current
B) directly proportional to armature current
C) proportional to the square of armature current
D) proportional to the square root of armature current
Ans:C
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