Q.1
The ferrite cores are used for ____________ transformers.
• a) Small transformers
• b) Medium transformers
• c) Large transformers
• d) Medium and small transformers
Q.2
• a) 43.33
• b) 42.54
• c) 43.11
• d) 41.47
Q.3
• a) 2π÷39
• b) 8π÷787
• c) 5π÷74
• d) 42π÷4
Q.4
• a) 1 kgm2
• b) .5 kgm2
• c) 2 kgm2
• d) 3 kgm2
Q.5
Calculate the moment of inertia of the thin spherical shell having a mass of 3 kg and diameter of 6 cm.
• a) .0178 kgm2
• b) .0147 kgm2
• c) .0398 kgm2
• d) .0144 kgm2
Q.6
The power factor of a synchronous motor __________
• a) Improves with an increase in excitation and may even become leading at high excitations
• b) Decreases with increase in excitation
• c) Is independent of its excitation
Q.7
The frame of a synchronous motor is made of _________
• a) Aluminum
• b) Silicon steel
• c) Cast iron
• d) Stainless steel
Q.8
• a) 2 Ω
• b) 3 Ω
• c) 4 Ω
• d) 1 Ω
Q.9
Which one of the following methods would give a higher than the actual value of regulation of the alternator.
• a) ZPF method
• b) MMF method
• c) EMF method
• d) ASA method
Q.10
A 3-phase induction motor runs at almostrpm at no load andrpm at full load when supplied with power from aHz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?
• a) 430 revolution per minute
• b) 440 revolution per minute
• c) 460 revolution per minute
• d) 450 revolution per minute
Q.11
Which of the following core has linear characteristics?
• a) Air core
• b) Steel core
• c) CRGO core
• d) Iron core
Q.12
• a) 2 W
• b) 4 W
• c) 7 W
• d) 1 W
Q.13
• a) .2544 Ω
• b) .7771 Ω
• c) .2308 Ω
• d) .5788 Ω
Q.14
• a) 39.7 N-m
• b) 39.2 N-m
• c) 38.4 N-m
• d) 37.2 N-m