A) motor B will have more windage losses as compared to motor A B) motor A will have more windage losses as compared to motor B C) motor B will be bigger in size as compared to motor A D) motor A will be bigger in size as compared to motor B. Ans : (D)
A) 25 HP, 4 pole B) 5 HP, 6 pole C) 2 HP, 6 pole D) 1 HP, 4 pole. Ans : (A)
A)5 HP, 720 rpm B) 5 HP, 960 rpm C) 5 HP, 1440 rpm D) all will have identical efficiency. Ans : (C)
A) the machine will burn B) both machines will stop C) synchronizing torque will be produced to restore further synchronism D) both machines will start hunting. Ans : (C)
A) it should have the same frequency at the slip frequency B) it should not be in phase with the supply voltage C) it should have the same frequency as the main supply voltage frequency D) it should have less frequency than main supply voltage frequency. Ans : (C)
A) high speed B) low magnetizing component of no load current, Io C) high working component of no load current, Io D) high magnetizing component of no load current, Io. Ans : (D)
A) motor A will run at higher speed as compared to motor B B) motor A will be smaller in size as compared to motor B C) motor A will have higher torque as compared to motor B D) motor A can use DOL stator and motor B can use star-delta starter. Ans : (B)
A) Over load B) Uneven airgap C) Low supply frequency D) Any of the above. Ans : (D)
A) Motor B has more pull out torque as compared to motor A B) Motor A has more pull out torque as compared to motor B C) Motor B has more starting torque as compared to motor A D) Motor A has more starting torque as compared to motor B. Ans : (C)
A) Low R and low X B) Low R and high X C) High R and low X D) High R and high X. Ans : (B)