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#2
July 11th, 2016, 08:23 AM
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| Re: BSNL TTA Previous Question Papers For CSE
Don’t worry buddy I will get the BSNL TTA (Telecom Technical Assistants) CSE post and looking for so that you can prepare hard. Here is the exam paper 1. In a D.C. generator, if the brushes are given a small amount of forward shift, the effect of armature is a. Totally demagnetizing b. Totally magnetizing c. Partly demagnetizing and partly cross magnetizing d. Totally cross magnetizing 2. The air gap between stator and armature of an electric motor is kept as small as possible a. To get a stronger magnetic field b. to improve the air circulation c. To reach the higher speed of rotation d. To make the rotation easier. 3. Two series motors are coupled. One motor runs as generator and other as motor. The friction losses of the two machines will be equal when a. Both operates at same voltage b. Both have same back emf c. Both have same speed d. both have same excitation 4. Plugging of D.C. motor is normally executed by a. Reversing the field polarity b. Reversing the armature polarity c. Reversing both the armature and field polarity d. Connecting a resistance across the armature. 5. Transformer oil transformer provides a. Insulation and cooling b. B. Cooling and lubrication c. Lubrication and insulation d. Insulation, cooling and lubrication 6. Leakage fluxes of transformer may be minimized by a. Reducing the magnetizing current to the minimum b. Reducing the reluctance of the iron core to the minimum c. Reducing the number of primary and secondary turn to the minimum d. Sectionalizing and interleaving the primary and secondary windings 7. Electric power is transformed upon one coil to other coil in a transformer a. Electrically b. Electro Magnetically c. Magnetically d. Physically 8. The most suitable and economical connection for small high voltage transformer isa. Star- Delta connection b. Delta- Delta connection c. Delta- Star connection d. Star- Star connection 9. An alternator is said to be over excited when it is operating at a. Unity power factor b. Leading power factor c. Lagging power factor d. Either lagging or leading power factor 10. In an A.C. machine, the armature winding is kept stationary while the field winding is kept rotating for the following rason a. Armature handles very large currents and high voltages b. Armature friction involving deep slots to accommodate large coils is easy if armature is kept stationary c. Ease of cooling the stator than rotor d. None of the above. 11. In a synchronous motor, the torque angle is the a. Angle between the rotating stator flux and rotor poles b. Angle between the magnetizing current and back emf c. Angle between the supply voltage and back emf d. None of the above 12. A 3-phase synchronous motor is said to be "floating" when it operates a. On no load and without loss b. On constantly varying load c. On pulsating load d. On high load and variable supply voltage   For full information please have a look on file |