Bihar SBTE Diploma Mechanical 3rd SEM Dec 2019 Paper on Electrical Engineering
| Sr. No. | Questions with options |
| 1 | Which of the following distribution system is NOT normally used
(a) 3 phase 3 wire (b) 3 phase 4 wire (c) Single phase, 2 wire (d) Single phase , 3 wire |
| 2 | Which of the following power plants operates on low speed?
(a) Hydro (b) Steam (c) Nuclear (d) Gas turbine |
| 3 | Which of the following instrument cannot be employed for D.C
(a) Moving iron (b) Electrostatic (c) Induction type (d) Hot wire |
| 4 | The commutator of a D.C motor serves the purpose of
(a) Changing A.C to D.C (b) Converting D.C to A.C (c) Induction friction (d) Avoiding arc at the brushers |
| 5 | Wave winding is employed in a D.C machine of
(a) High current and low voltage rating (b) Low current and high voltage rating (c) High current and high voltage rating (d) Low current and low voltage rating |
| 6 | Unit of reactive power is
(a) VA (b) Watt (c) VAR (d) Ohm |
| 7 | For a D.C voltage an inductor is
(a) Virtually a short circuit (b) Is open circuit (c) Depends on polarity (d) Depends on voltage value |
| 8 | The e.m.f induced in a conductor rotating in a bipolar field is
(a) D.C (b) A.C (c) D.C and A.C (d) None of these |
| 9 | For quick speed reversal the motor preferred is
(a) D.C motor (b) Squirrel cage induction motor (c) Slip ring induction motor (d) Synchronous motor |
| 10 | In the transformer equivalent circuit, the core loss is represented as a
(a) Series resistance (b) Shunt resistance (c) Shunt inductance (d) Series inductance |
| 11 | The speed of an induction motor depends on
(a) Number of stator poles (b) Stator supply frequency (c) Input voltage of to stator (d) All of the above |
| 12 | Integrating meters are used for the measurement of
(a) Voltage (b) Current (c) Energy (d) Phase |
| 13 | The input to a stepper motor is in the form of
(a) Electric pulses (b) Friction force (c) Mechanical inertia (d) Viscous damping force |
| 14 | Running the machine at no load is NOT advisable for
(a) D.C shunt motor (b) D.C series motor (c) Induction Motor (d) Synchronous motor |
| 15 | The minimum number of windings required for producing a poly phase field is
(a) One (b) Two (c) Three (d) None of these |
| 16 | The speed of a squirrel cage induction motor cannot be controlled by
(a) Pole changing (b) Frequency control (c) Rotor resistance control (d) Line voltage control |
| 17 | A fuse is
(a) Always connected in parallel with the circuit (b) Always connected in series with circuit (c) Normally connected in series with the circuit (d) Normally connected in parallel with the circuit |
| 18 | Power factor is highest in case of
(a) Sodium vapour lamp (b) In candescent lamp (c) Mercury vapour lamp (d) Neon lamp |
| 19 | Earthing of electric equipment is necessary for the protection against?
(a) Over loading (b) Danger of electric shock (c) High conductor temperature (d) Voltage fluctuation |
| 20 | The transformer used in a welding set is
(a) Step – up transformer (b) Step down transformer (c) Booster transformer (d) Constant current transformer |
| Data Collected By – Rashmi | |
| Published On – 30th May 2022 | |
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