Dc Machines Freshers Online Exam Quiz
Dc Machines Freshers GK Quiz. Question and Answers related to Dc Machines Freshers. MCQ (Multiple Choice Questions with answers about Dc Machines Freshers
In a DC machine, what is the torque induced beyond the pole shoes?
Options
A : 0
B : 2/? *?*i
C : ? *?*i/2
D : Can’t be calculated
A 4-pole Dc wound machine is lap wound with 400 conductors. The pole shore is 20 cm long and average flux density over one-pole pitch is 0.4 T, the armature diameter being 30 cm. What is the value of flux/pole?
Options
A : 0.188 Wb
B : 18.88 Wb
C : 0.0188 Wb
D : 1.888 Wb
Coil torque for 20 kA armature current (T1) and 40 mA armature current (T2), will have ratio T1/T2=____ (assuming all other parameters same for both machines).
Options
A : 1/2
B : 2/1
C : 1/4
D : 4/1
A 4-pole Dc wound machine is lap wound with 400 conductors. The pole shore is 20 cm long and average flux density over one-pole pitch is 0.4 T, the armature diameter being 30 cm. What is the value of induced emf?
Options
A : 188 V
B : 276 V
C : 94 V
D : 188 mV
For an ideal DC machine, which phenomenon will reduce the terminal voltage?
Options
A : Armature reaction
B : Commutation
C : Armature ohmic losses
D : All will contribute in reducing the terminal voltage
For a constant emf, if field current is reduced then the speed of the DC motor will_____
Options
A : Remains same
B : Increases
C : Decreases
D : Can’t say
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