Question82:-The efficiency of a transformer is maximum when
കിട്ട Cu 1055 equals iron loss
Belts Cu loss greater than iron 1055
Colts Cu loss less than iron loss
Det runs at half load
Correct Answer:- ೦೧000
Question83:-Earth fault relays are
‘Ac Under voltage relay
B:-Directional relay
C:-Non-directional relay
D-Over voltage relay
Correct Answer: Option ®
Question84::Which of the following relays has inherent directional characteristics ?
‘AcPower relay
B:-Impedance relay
೦-110 relay
D-Reactance relay
Correct Answer: Option-C
Question85:-Which braking system is used to save energy during braking ?
‘Ac Plugging
B:-Rheostatic braking
C=Dynamic braking
Regenerative braking
Correct Answer:- Option-D
Question86:-Commutator in DC generator is used for
‘Ac Reduce sparking
नि voltage
Collecting of current
D-Convert AC armature current in to DC
Correct Answer:- Option-D
Question87:f field current is decreased in a shunt motor, the speed
‘Ac Decreases
Bs-Increases
C-Remains same
5:20
Correct ۸۳۰۸۷۴ ೦೧0078.
Question88:-Inter pole winding is connected in
‘A-Series with armature
B:-Parallel with armature
Series with main poles
Parallel with main poles
Correct Answer:- ೦೧000
Question89:-The time base signal ina CRO is,
‏ننم‎ square wave signal
8:8 sinusoidal signal
‏هيت‎ saw tooth signal
DA triangular wave signal
Correct Answer: Option-C
Question90:-The effect of increasing the length of the air gap in an induction motor will be to increase

ರ್ಜ gap flux