Which D.C. motor is generally preferred for cranes and hoists ?
Which D.C. motor is generally preferred for cranes and hoists ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor
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Which of the following loss in a D.C. generator varies significantly with the load current ?
Which of the following loss in a D.C. generator varies significantly with the load current ?
A. Field copper loss
B. Windage loss
C. Armature copper loss
D. None of the aboveWith the increase in temperature, the speed of DC shunt motor____________?
With the increase in temperature, the speed of DC shunt motor____________?
A. decreases.
B. increases
C. remain same
D. none of the aboveWhich of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
A. Lenz’s law
B. Faraday’s law
C. Coloumb’s law
D. Fleming’s left-hand ruleThree point starter can be used for______________?
Three point starter can be used for______________?
A. series motor only
B. shunt motor only
C. compound motor only
D. both shunt and compound motorWhich of the following motor is preferred for operation in highly explosive atmosphere ?
Which of the following motor is preferred for operation in highly explosive atmosphere ?
A. Series motor
B. Shunt motor
C. Air motor
D. Battery operated motorIn variable speed motor___________?
In variable speed motor___________?
A. a stronger commutating field is needed at low speed than at high speed
B. a weaker commutating field is needed at low speed than at high speed
C. same commutating field is needed at low speed than at high speed
D. none of the above is correct