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ISRO 2023 Quiz 11
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Question 1
In V/F control of a 3-phase induction motor, if voltage is increased by 10%, to keep air gap flux constant, what is the % increment or decrement in frequency?
Question 2
Ferrite cores are used in high frequency transformer because it has:
Question 3
A horizontal disc of radius 70 cm provided on a vertical spindle, rotates at a speed of 1500 rpm in a vertical directed magnetic flux density 1.2T as shown in figure tow brushes, one on the spindle at A and other at B, then the magnitude of emf is approximately _______V.
Question 4
A 220 V d.c. shunt motor running at 1000 rpm at full load torque rated voltage and full filled. If load torque is induced to 40% of rated value with armature voltage and field voltage need constant at previous values, the speed increases to 1050 rpm. The armature voltage drop at full load torque is ______ volts [neglect armature reaction].
Question 5
Find the value of ‘S’ if
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Dec 20ESE & GATE EE