a) Increase in its flux b) Decrease in back emf c) Increase in armature current d) Decrease in brush drop Ans: (b)
a) Decrease by about 10 per cent b) Remain unchanged c) Increase by about 10 per cent d) Increase by 20 per cent Ans: (c)
a) It slow down b) It would draw extremely high armature current c) Its speed becomes dangerously high d) Torque developed by the motor would be reduced to zero Ans: (c)
a) Approach zero b) Approach infinity c) Not change d) Approach a stable value between zero and infinity Ans: (b)
a) Increasing the armature current b) Decreasing the armature current c) Increasing the excitation current d) Reducing the field current Ans: (d)
a) Increases b) Decreases c) Remains unchanged d) Fist increases and then decreases Ans: (a)
a) 100% b) About 90% c) 75% d) Less than 50% Ans: (d)
a) Fans b) Water pumps c) Traction d) flour mills Ans: (c)
a) Series motor b) Shunt motor c) Separately excited d) Cumulatively compound motor Ans: (a)
a) Series motor b) Shunt motor c) Cumulatively compound motor d) Separately excited motor Ans: (b)
a) Eddy current losses b) Stray losses c) Hysteresis losses d) Copper losses Ans: (b)
a) Remain unchanged b) Decrease by 4% c) Increase by 4% d) Increase by 16% Ans: (c)
 Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. c) The saturation voltage VCE for silicon transistor is same as that for germanium. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. |
Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? a) Inner electrons are always present in the semiconductor. b) Bound electrons are always present in the semiconductor. c) Free electrons are always present in the semiconductor. d) Inner and bound electrons are always present in the semiconductor. |
Multiple Choice Question (MCQ) of Electronics page-15:211. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are a) Semiconductors b) Conductors c) Insulators d) Alloys |
Multiple Choice Question (MCQ) of Electronics page-14:196. In which of the following device the base resistors are not added in the package but added externally? a) UJT b) CUJT c) PUT d) None of the above |
Multiple Choice Question (MCQ) of Electronics page-13:181. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes d) Electrons e) Holes and electrons simultaneously |