Specifications

176
QUESTIONS
Part - A
Choose the Correct Answer (1 Mark)
1. The maintenance work carried out on the machine after it has failed to work is called
A) Breakdown maintenance B) Preventive maintenance
C) Periodic maintenance D) Predictive maintenance.
2. If air gap shows variation in the top, bottom sides, it is due to
A) bent shaft B) Lamination worn out
C) Worn out bearings D) Rotor worn out.
3. Best method of removing a bearing is by using a
A) Hammer B) Chisel
C) Caliper D) Bearing puller
4. Withdrawal force, while removing a bearing, should be applied to
A) Outer ring B) Inner ring
C) Outer side of shaft D) Bearing cover
5. Long service life of bearing depends mainly on
A) Type of load B) Sealing arrangement
C) Operating temperature D) Frequency of relubrication
6. For proper alignment of motor coupled sets, the axis of both the shafts should be
A) at an angle B) In the same line
C) Perpendicular D) at an obtuse angle.
7. Main reason for insulation failure in normally operating motor is
A) High temperature B) Moisture absorption
C) High voltage fluctuations D) Unbalanced load
8. Moisture is the air is prevented from absorption in motor insulation by
A) laminating the windings B) applying varnish
C) covering with plastic sheets D) vacuum sealing
9. Excessive wear of carbon brushes indicates
A) low spring tension B) poor commutation
C) high spring tension D) high speed of operation
10. Ridges are formed on commutator, if the different rocker arms are not properly .
A) staggered B) aligned
C) insulated D) connected