Question

Write True/False :
(i) Manual handling causes over a third of all workplace injuries.
(ii) Maintenance cost of slip ring motor is less as compared to squirrel cage motor.
(iii) Always place transformer in a dry area.
(iv) The core of electromagnet is made up of soft iron or silicon steel lamination.
(v) Three-phase induction motors are used for domestic purposes.
(vi) DC series motor is used when high starting torque is required.

Answer 1

Manual handling causes over a third of all workplace injuries. hfill True
textitExplanation: Manual handling is a major cause of workplace injuries due to strain and improper lifting.
Maintenance cost of slip ring motor is less as compared to squirrel cage motor. hfill False
textitExplanation: Slip ring motors have higher maintenance costs because of brushes and slip rings.
Always place transformer in a dry area. hfill True
textitExplanation: Transformers should be kept in dry areas to prevent moisture damage and insulation failure.
The core of electromagnet is made up of soft iron or silicon steel lamination. hfill True
textitExplanation: Soft iron or silicon steel laminations reduce eddy current losses in electromagnet cores.
Three-phase induction motors are used for domestic purposes. hfill False
textitExplanation: Single-phase induction motors are typically used for domestic appliances; three-phase motors are used industrially.
DC series motor is used when high starting torque is required. hfill True
textitExplanation: DC series motors provide high starting torque and are used in applications like cranes and hoists.