Electric Generator
Trending Questions
Q. The total length of a sonometer wire between fixed ends is 110 cm.Two bridges are placed to divide the length of wire in ratio 6:3:2. The tension in the wire is 400N and the mass per unit length is 0.01 kg/m. What is the minimum common frequency with which three part can vibrate? (1) 1100 Hz (2) 1000 Hz (3) 166 Hz (4) 100 Hz
Q. The frequency of ac mains in India is
- 30 c/s or Hz
- 50 c/s or Hz
- 60 c/s or Hz
- 120 c/s or Hz
Q.
What would be the change in the speed of wave if tension in wire is increased nine times?
Decrease to half its original speed
Increases continuously
remains same
Becomes thrice
Q. Potentiometer is an instrument which can be used to determine ,
- Resistance
- Internal resistance of cell
- Inductance
- Capacitance
Q. 35.Two Cu wires have diameter in the ratio 2:1 and tension in the ratio of 1:2 .the ratio of velocities of longitudinal wave in them is ??
Q. A polythene piece rubbed with wool is found to have a negative charge of 3×10−7 C. The number of electrons transferred between the materials is:
- 3×10−7 electrons from wool to polythene
- It is not possible to have 3×10−7 C charges
- 1.875×1012 electrons from wool to polyethene
- 3×10−7 electrons from polythene to wool
Q. A polythene piece rubbed with wool is found to have a negative charge of 3×10−7 C. The number of electrons transferred between the materials is:
- It is not possible to have 3×10−7 C charges
- 1.875×1012 electrons from wool to polyethene
- 3×10−7 electrons from polythene to wool
- 3×10−7 electrons from wool to polythene
Q. Potentiometer is an instrument which can be used to determine ,
- Resistance
- Internal resistance of cell
- Inductance
- Capacitance
Q. The phase difference between the flux linkage and the induced e.m.f. in a rotating coil in a uniform magnetic field
- Π
- Π2
- Π4
- Π6
Q. The number of turns in the coil of an ac generator is 5000 and the area of the coil is
0.25m2. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 W/m2. The peak value of the emf generated is nearly
0.25m2. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 W/m2. The peak value of the emf generated is nearly
- 786 kV
- 440 kV
- 220 kV
- 157.1 kV