Dc Machines Emf Torque Production 1 Online Exam Quiz
Dc Machines Emf Torque Production 1 GK Quiz. Question and Answers related to Dc Machines Emf Torque Production 1. MCQ (Multiple Choice Questions with answers about Dc Machines Emf Torque Production 1
What is the value of pole pitch (in SI unit) for mean air gap radius= 0.5mm and P=4?
Options
A : 0.785* 10-6
B : 0.785* 10-3
C : 0.785* 10-2
D : 0.785* 10-4
Average coil emf for 20 coil turns (E1) and 40 coil turns (E2), will have ratio E1/E2=____ (assuming all other parameters same for both machines).
Options
A : 1/2
B : 2/1
C : 1/4
D : 4/1
What is the average coil emf generated in a 4-pole DC machine having flux/pole equal to 0.1 wb rotating at 1500 rpm? (No. of coil sides = 100)
Options
A : 19 kV
B : 1.9 kV
C : 190 V
D : 19 V
What is the value of Np in an average coil emf equation, for 10 armature conductors with 2 parallel paths?
Options
A : 2
B : 3
C : 2.5
D : 4
Emf and torque produced in a DC machine are proportional to ________ and _________ respectively.
Options
A : Armature speed and armature emf
B : Armature emf and armature speed
C : Armature current and armature emf
D : Armature speed and armature current
What is the torque equation in terms of B, Ic, l, Zr (r= mean air gap radius)?
Options
A : Bav*Ic*l*Zr
B : Bav*Ic*l/Zr
C : Bav*Ic*Zr/l
D : Can’t be expressed
Emf produced by DC machine, for zero armature current (E1) and non-zero armature current (E2) can be related as__________
Options
A : E1 = E2
B : E1 > E2
C : E1 < E2
D : Can’t be determined
Nature of the flux density wave in the air gap is__________ (for armature current equal to 0)
Options
A : Flat topped with quarter wave symmetry
B : Point topped with quarter wave symmetry
C : Flat topped with half wave symmetry
D : Point topped with half wave symmetry
In which mode machine is operating, given that conductor current is in the same direction of conductor emf?
Options
A : Motoring
B : Generating
C : Can’t be determined using directions
D : In both modes for different cycles
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