Dc Machines Mcqs Online Exam Quiz
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Which of the following is the correct equation for DC series motor ________
Options
A : [ Vt / k?]- [ Rse +Ra / k?] Ia
B : [ Vt / k?]- [ Ra/ k?2] Ia
C : [ Vt / k?2]- [Rse +Ra/ k?2] Ia
D : [ Vt / k?2] + [ Ra/ k?2] Ia
Which motor should not be started on no-load?
Options
A : DC Series motor
B : DC Shunt motor
C : Synchronous motor
D : Induction motor
Torque of e DC series motor is __________
Options
A : Directly proportional to armature current
B : Inversely proportional to armature current
C : Directly proportional to square of armature current
D : Inversely proportional to square of armature current
Buses, trains, trolleys, hoists, cranes make use of DC series motor because __________
Options
A : It provides low starting torque
B : Cost efficient
C : It provides high starting torque
D : It requires minimum power compare to other motors
What will happen to a torque, if a DC series motor is accidentally connected to single phase ac supply voltage?
Options
A : Pulsating and unidirectional
B : Steady and unidirectional
C : Oscillating
D : Cannot be determined
Actual speed obtained at any value of armature current comparing to speed obtained by assuming linear magnetic assumption in DC series motor is _______
Options
A : Same
B : Higher
C : Lower
D : Cannot say
DC motor is to drive a load which is having certain minimum value for most of the time and some peak value for short duration. We will select the _______
Options
A : Series motor
B : Shunt motor
C : Compound motor
D : Cannot be determined
Which DC motor has got maximum self-relieving property?
Options
A : Series motor
B : Shunt motor
C : Cumulatively compounded motor
D : Differentially compounded motor
Which DC motor is generally preferred for cranes and hoists?
Options
A : Series motor
B : Shunt motor
C : Cumulatively compounded motor
D : Differentially compounded motor
Which of the following motor has the poorest speed regulation?
Options
A : Shunt motor
B : Series motor
C : Differential compound motor
D : Cumulative compound motor
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