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Mock test – SSC JE
#1. Two holes are drilled in the disc on a diameter of energy meter to....?
reduce the weight of disc
eliminating creeping on no load
increase deflecting torque
#2. The B-H curve of.....will be a straight line passing through the origin?
#3. The main advantage of temporary magnet is that we can...?
change the magnetic flux
magnetize without any source
decrease the hysteresis losss
use any magnetic material
#4. A circuit has inductance of 2 H. If the circuit current changes at the rate of 10A/sec, then self induced emf is...?
emf = L X di/dt = 2×10= 20V
#5. Dielectric loss is propotional to...?
half of the frequency
one third of the frequency
square of the frequency
#6. In a three phase induction motor crawling happens at...?
no load speed
even multiples of fundamental
odd multiples of fundamental
#7. In a capacitor start single phase induction motor, the current in the...?
starting winding leads the voltage
starting winding laggs the voltage
main winding laggs the voltage
supply lines leads the voltage
#8. Hysteresis is the phenomenon in the magnetic circuit by which...?
B & H are always same
setting up a constant flux is done
H lags behind B
B lags behind H
#9. The magnetic material used for making permanent magnet is.....?
#10. The AC bridge that used for measurement of dielectric loss of a capacitor is....?
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