Computer Programming MCQs

5739 MCQs  (Page 55 of 574)

Welding generator will have____________?
A. Lap winding
B. Wave winding
C. Delta winding
D. Duplex wave winding
In case of D.C. machine winding, number of commutator segments is equal to______________?
A. Number of armature coils
B. Number of armature coil sides
C. Number of armature conductors
D. Number of armature turns
For a D.C. machines laboratory following type of D.C. supply will be suitable___________?
A. Rotary converter
B. Mercury are rectifier
C. Induction motor d.c. generator set
D. Synchronous motor d.c. generator set
The function of pole shoes in the case of D.C. machine is______________?
A. To reduce the reluctance of the mag¬netic path
B. To spread out the flux to achieve uniform flux density
C. To support the field coil
D. To discharge all the above functions
In the case of lap winding resultant pitch is____________?
A. Multiplication of front and back pitches
B. Division of front pitch by back pitch
C. Sum of front and back pitches
D. Difference of front and back pitches
A D.C. welding generator has____________?
A. Lap winding
B. Wave moving
C. Duplex winding
D. Any of the above
Which of the following statement about D.C. generators is false ?
A. Compensating winding in a d.c. machine helps in commutation
B. In a d. c. generator interpoles winding is connected in series with the armature winding
C. Back pitch and front pitch are both odd and approximately equal to the pole pitch
D. Equilizing bus bars are used with parallel running of d.c. shunt gen¬erators
The demagnetising component of armature reaction in a D.C. generator___________?
A. Reduces generator e.m.f.
B. Increases armature speed
C. Reduces interpoles flux density
D. Results in sparking trouble
Magnetic field in a D.C. generator is produced by_______________?
A. Electromagnets
B. Permanent magnets
C. Both a. and b.
D. None of the above
The number of brushes in a commutator depends on______________?
A. Speed of armature
B. Type of winding
C. Voltage
D. Amount of current to be collected