Question is ⇒ Regenerative braking on D.C. shunt motors is used when, Options are ⇒ (A) the load has overhauling characteristics, (B) the load is variable, (C) the load also acts as a braking force, (D) the load is constantly decreasing, (E) , Leave your comments or Download question paper.

Question is ⇒ Regenerative braking on D.C. shunt motors is used when, Options are ⇒ (A) the load has overhauling characteristics, (B) the load is variable, (C) the load also acts as a braking force, (D) the load is constantly decreasing, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Regenerative braking on D.C. shunt motors is used when
A.	the load has overhauling characteristics [Correct Answer]
B.	the load is variable [Wrong Answer]
C.	the load also acts as a braking force [Wrong Answer]
D.	the load is constantly decreasing [Wrong Answer]
View Answer 22 -17 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ D.C. generators are installed near the load centres to reduce
iron losses
line losses
sparking
corona losses

⇒ A direct on line starter is used for starting motors
up to 5 H.P.
up to 10 H.P.
up to 15 H.P.
up to 20 H.P.

⇒ When two D.C. series motors are connected in parallel, the resultant speed is
more than the normal speed
loss than the normal speed
normal speed
zero

⇒ Small D.C. motors up to 5 H.P. usually have
2 poles
4 poles
6 poles
8 poles

⇒ The condition for maximum efficiency for a D.C. generator is
eddy current losses = stray losses
hysteresis losses = eddy current losses
copper losses = 0
variable losses = constant losses

⇒ The purpose of retardation test on D.C. shunt machines is to find out
stray losses
eddy current losses
field copper losses
windage losses

⇒ In an overloaded motor main danger arises due to
winding getting overheated
busbars getting heated
starter getting damaged
bearings getting overheated

⇒ The generated e.m.f. and the current are in the opposite direction in case of
d.c. generators
d.c. motors
both (a) and (b)
none of the above