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- The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm...
- For the production of induced e.m.f. field system of an electric machine_________.
- Five cells, each with an e.m.f. of 2V and internal resistance of 0.5Ω are connected in series.
- If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by?
- While applying Fleming's right-hand rule to And the direction of induced e.m.f., the thumb points towards?
- Which law states that induced e.m.f and current always opposes the cause producing them?
- In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called?
- Which of the following quantity maintains the same direction whether a D.C. machine runs as a generator or as a motor a. Induced e.m.f. b. Armature Current c. Field Current d. Supply Current
- These self inductance of a circuit is defined as twice the work done against the induced e.m.f.
- The e.m.f. induced in the primary of a transformer: ...
- The induced e.m.f. in the armature conductors of a d.c. motor is?
- According to Fleming's right-hand rule for finding the direction of induced e.m.f...
- When the armature of a D.C. motor rotates, e.m.f. induced is
- As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent...
- When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
- If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?
- Fleming's right-hand rule regarding direction of induced e.m.f., correlates?
- The voltage regulation for 0.95 lead pf is zero for an alternator. If so, the voltage regulation for 0.9 lead...
- A 60 Hz, 320 km lossless line has Bending end voltage 1.0 p.u, The receiving end voltage on no load is
- A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m...
- If the no load voltage of a certain generator is 220V and the rated load voltage is 200V, then the voltage regulation is: a. 1% b. 10% c. 20V d. 9%
- The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second...
- A d.c. shunt motor runs at no load speed of 1140 r.p.m. At full load armature reaction weakens the main flux
- The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?
- Define armature reaction in an alternator. Explain the effect of armature reaction at various P.F. of loads of alternator.
- The efficiency of a transformer at full load 0.8 p.f lagging is 90%. Its efficiency at full load 0.8 p.f...
- A 500 MW, 3-phase, Y-connected synchronous generator has a rated voltage of 21.5 kV at 0.85 p.f. The line
- In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will?
- If the load p.f. is 0.866, then the average p.f. the v-bank is
- If an incandescent lamp of 80 ohms resistance takes a current of 0.75 ampere, what voltage is
- A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and
- An instantaneous value of an alternating voltage having 50hz frequency and max value of 100v at 0.01sec is
- An alternator is delivering rated current at rated voltage and 0.8 power-factor lagging. For delivering rated...
- The direction of inducted e.m.f. can be found with the help of
- In a Synchronous motor, the magnitude of stator back e.m.f (Eb) depends on
- The back e.m.f of a motor at the moment of starting : -
- The counter e.m.f. of a d.c. motor?
- "In any network containing more than one sources of e.m.f. the current in any branch is the algebraic ...
- It is required to measure the true open circuit e.m.f. of a battery. The best device is?
- If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?
- In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?
- What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
- The value of flux involved in the e.m.f. equation of a transformer is ?
- An auto transformer having a transformation ratio of 0.8 supplies a load of 10 kW. The power transferred
- (a) Define permeability. (b) Define MMF. (c) Define form factor of an alternating quantity. (d) Define frequency and time period of an alternating quality. (e) Define transformation ratio of transformer. (f) State the EMF equation of a 1 transformer and state the meaning of each term used. (g) Give two applications of single phase motors.
- What is the back E.M.F in Transformer ?
- Define the following terms as referred to battery. a) E.M.F b) Internal resistance c) Ah efficiency d) WAh efficiency
- The e.m.f. generated in a D.C. generator is directly proportional to?
- In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?
- Explain variation of thermo e.m.f. with temperature.