Top 150+ Solved DC Generators MCQ Questions Answer
Q. For both lap and wave windings, there are as many commutator bars as thenumberof
a. slots
b. armature conductors
c. winding elements
d. poles
Q. The series field of a short-shunt D.C. generator is excited by
a. external current
b. armature current
c. shunt current
d. load current
Q. As a result of armature reaction, the reduction in the total mutual air gap fluxin aD.C. generator is approximately
a. 40 percent
b. 25 percent
c. 10 percent
d. 5 percent
Q. Shunt generators are most suited for stable parallel operation because of their
a. rising voltage characteristics
b. identical voltage characteristics
c. drooping voltage characteristics
d. linear voltage characteristics
Q. The main factor which leads to unstable parallel operation of flat and over compounded generators is
a. their rising voltage characteristics
b. unequal number of turns in their series field windings
c. unequal speed regulation of their primemovers
d. unequal series field resistances
Q. The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
a. absence of harmonics
b. non-existence of any stability limit
c. smaller dielectric loss
d. absence of ripples
Q. In case of three core flexible cable the colour of the neutral is
a. blue
b. black
c. brown
d. none of the above
Q. cables are used for 132 kV lines.
a. High tension
b. Super tension
c. Extra high tension
d. Extra super voltage
Q. Conduit pipes are normally used to protect _____ cables.
a. unsheathed cables
b. armoured
c. PVC sheathed cables
d. all of the above
Q. The minimum dielectric stress in a cable is at
a. armour
b. bedding
c. conductor surface
d. lead sheath
Q. In single core cables armouring is not done to
a. avoid excessive sheath losses
b. make it flexible
c. either of the above
d. none of the above
Q. In a cable, the maximum stress under operating conditions is at
a. insulation layer
b. sheath
c. armour
d. conductor surface