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WorksheetsEXPERIMENT 1: DC MACHINE CONSTRUCTIONAL FEATURES & STARTER
Total questions: 15
Worksheet time: 11mins
The Current flowing through the armature of the dc motor is:
DC
AC
Pulsating
None of the Answers
_________ field winding has small number of turns of thick
copper wire.
Shunt
Series
Compund
Separately excited
In DC Generator which of the following device plays a key role in providing dc current:
Commutator
Equalizer rings
Brushes
Dummy Coils
In which mode machine is operating, given that conductor
current is in the same direction of conductor emf?
Motoring
Generating
Can’t be determined using directions
In both modes for different cycles
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
Gravity
Magnetic flux density/size of magnetic field
Size of the current
Length of the conductor
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
180
45
270
90
Emf and torque produced in a DC machine are proportional to________ and _________ respectively.
Armature speed and armature emf
Armature emf and armature speed
Armature current and armature emf
Armature speed and armature current
Starter is used in DC motor for which of the following purpose:
improving back emf
improving starting torque
improving efficiency
reducing starting current
For what type of applications the lap winding is used in DC
generators:
high current applications
high power applications
high voltage applications
high frequency applications
The power rating that is indicated on name plate of any motor is:
gross power
output power of shaft
power drawn in kVA
net power
Which type of power supply is given to Generator Field winding:
pulsating DC supply
AC supply
DC supply
none of these
The armature core is mounted on .................. of the DC generator:
slots
shaft
yoke
pole shoe
In three-point starter, as a starting handle is rotated __________
The resistance is added into armature circuit
The resistance is removed from field circuit
The resistance is removed into armature circuit
Resistance is neither added nor removed
Which of the following is not required in DC generator to
generate DC Voltage?
conductor
Slip ring
Prime mover
Magnetic Field
Where is field winding mounted in a DC machine?
Stator
Rotor
Anywhere on stator or rotor
Absent
