Short notes
Objective questions (Answers are given below)
- Heat dissipation is assumed proportional to
(a) Temperature difference
(b) Temperature difference between motor
and cooling medium
(c) Temperature of cooling medium - Temperature of cooling medium is assumed
(a) constant (b) variable - When the motor reaches final temperature rise
its temperature remains
(a) constant
(b) falls
(c) rises. - For intermittent load, a motor of smaller rating
can be used
(a) true (b) false - If motor is disconnected from supply, final
temperature reached will be the ambient
temperature
(a) true (b) false - Final temperature rise is theoretically attained
only after
(a) fixed time
(b) variable time
(c) infinite time - Motor is derated when taken at altitude
(a) Yes (b) No - The rolling mill load
(a) is constant
(b) fluctuates widely within long intervals of
time
(c) fluctuates widely within short intervals
of time
(d) varies - Size of motor is decided by
(a) load
(b) current
(c) heat produced in motor
(d) torque - Tariff is affected by sudden load drawn by
motor
(a) true (b) false - Flywheel helps in smoothing only
(a) speed fluctuations
(b) current fluctuations
(c) both of the above - To use flywheel, motor should have
(a) constant speed characteristics
(b) drooping speed characteristics
(c) variable speed characteristics - During light load period
(a) flywheel absorbs energy
(b) flywheel gives up energy
(c) flywheel does nothing - During peak load periods
(a) flywheel absorbs energy
(b) flywheel gives up energy
(c) flywheel does nothing - Large size of flywheel
(a) can be used practically
(b) can’t be used practically
- (b) 2. (a) 3. (a) 4. (a) 5. (a) 6. (c) 7. (a) 8. (c) 9. (c) 10. (a) 11.(c) 12. (b) 13. (a) 14. (b) 15. (b)
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