# Turns Ratio

## Trending Questions

**Q.**

What is the quality factor of RLC circuit?

**Q.**What is the value of iota the power iota?

**Q.**The self-inductance of the motor of an electric fan is 10 H. In order to impart maximum power at 50 Hz, , it should be connected to a capacitance of

- 4 μF
- 8 μF
- 1 μF
- 2 μF

**Q.**Four ideal diodes are connected as shown in circuit.

The current through 20 Ω resistor will be

- 0.2 A
- 0.3 A
- 0.5 A
- Zero

**Q.**

A hot plate of an electric oven connected to a 220 $V$ line has two resistance coils A and B, each of 24 resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases?

**Q.**Power factor of the circuit will be zero, if circuit is

- LR
- R
- L
- LCR

**Q.**

What are transistor parameters?

**Q.**

The winding of a motor has a resistance of 80 ohms at 15^{0}C. Find its resistance at 50^{0} C. the temperature co-efficient of resistance is 0.004/^{0}C

60.57Ω

80.0Ω

90.56Ω

75.47Ω

**Q.**Two copper wires have their masses in the ratio 2 : 3 and the lengths in the ratio 3 : 4. The ratio of their resistances is:

- 27:32
- 16:9
- 4:9
- 1:2

**Q.**For a common emitter amplifier, current gain is 60. If the emitter current is 6.6mA the collector current is

- 0.108 mA
- 6.492 mA
- 1.1 mA
- 3.3 mA

**Q.**In an ideal transformer, the voltage and the current in primary coil are 200V and 2A respectively. If the voltage in the secondary coil is 200 V, then the value of current in the secondary coil will be

- 10 A
- 20 A
- 0.2 A
- 2 A

**Q.**The number of turns in primary and secondary coils of an ideal transformer is 50 and 200 respectively. If the current in the primary coil is 4 A. The current in the secondary coil is-

- 1 A
- 2 A
- 4 A
- 5 A

**Q.**

In the given circuit, find the power consumed by the circuit.

$1.07W$

$2.07W$

$3.07W$

$4.07W$

**Q.**An iron transformer assumed to be 100 % efficient. The ration of the secondary truns to the primary truns is 1:20. A 240 V ac supply is connected to the primary coil. What is the current in the primary coil?

- 0.1 A
- 0.14 A
- 2 A
- 40 A

**Q.**A transformer has 200 turns in primary coil and 600 turns in secondary coil. If a 220 V DC is applied across the primary coil, what will be the voltage across the secondary coil.

- 2203 V
- 660 V
- Zero
- 220 V

**Q.**A parallel combination of an inductor coil and a resistance of 60 Ω is connected to an ac source. The current in the coil, current in the resistance and the source current are 3 A, 2.5 A and 4.5 A respectively. Therefore

- kirchhoff's current law is NOT applicable to ac circuits
- impedance of the coil is 50 Ω
- electric power dissipated in the coil is 150 W
- impedance of the circuit is 33.3 Ω

**Q.**A voltmeter connected to the terminals of battery reads 6 V initially. When the lamp is lighted with the battery, same voltmeter reads 4 V. If resistance of lamp is 10 Ω, resistance of battery in Ohms is

**Q.**The resistance of the coil of a tangent galvanometer is 60 Ω. It is connected to a battery of negligible internal resistance. The deflection is found to be 60∘. Now a shunt resistance of 30 Ω is connected across the coil of the tangent galvanometer. The deflection produced will be

**Q.**A coil having self-inductance L is connected in series with a bulb B with an AC source. Brightness of the bulb decrease when-

- An iron rod is inserted in the coil
- Frequency of the AC source is decreased
- Number of turns in the coil is reduced
- A capacitance of reactance XC=XL included in the same circuit.

**Q.**A circuit, containing an inductance and a resistance connected in series, has an AC source of 200 V, 50 Hz connected across it. An AC rms current of 10 A flows through the circuit and the power loss is measured to be 1 kW. Then

- The inductance of the circuit is √310π H.
- The frequency of the AC when the phase difference between the current and emf becomes π4, with the above components is 50√3Hz
- The frequency of AC, at which the reactive power is half of the actual power lost is 25√3Hz
- The frequency of the AC when the phase difference between the current and emf becomes π4, with the above components is 25√3Hz.

**Q.**A coil has a resistance of 10 Ω and an inductance of 0.4 H. It is connected across an AC source of 6.5 V, 30π Hz. The average power consumed in the circuit is

- 0.625 W
- 0.325 W
- 0.925 W
- 0.125 W

**Q.**Two alternating voltage generators produce EMFs of the same amplitude E0 but with a phase difference of π/3. The magnitude of resultant EMF is

- √5E0
- E0
- √2E0
- √3E0

**Q.**

A $2W$ carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is :

$0.4mA$

$20mA$

$63mA$

$100mA$

**Q.**4.A grinder motor is designed to operate at a current of 5 A and at a p.d. of 200 V. What resistance must be connected in series with the motor so as to maintain the rated current when it is operated on a 220 V line?

**Q.**A 1250 W, 115 V heater operates at 115 V. What is the resistance of the heating coil?

**Q.**In the circuit shown in the figure, resistors X and Y, each with resistance R, are connected to a 6 V battery of negligible internal resistance. A voltmeter, also of resistance R, is connected across Y.

What is the reading of the voltmeter ?

- zero
- between 0 and 3 V
- 3 V
- between 3 V and 6 V

**Q.**A power transmission line feeds input power at 2300 V to a stepdowntransformer with its primary windings having 4000 turns. Whatshould be the number of turns in the secondary in order to get outputpower at 230 V?

**Q.**For the circuit shown in the figure, the EMF of the generator is E. The current through the inductor is 3 A, while the current through the condenser is 1 A then current drawn from the generator is

**Q.**A generator produces time varying voltage given by E=240sin120t, where t is in second. The average value of voltage for the half cycle is -

- 123 V
- 133 V
- 143 V
- 153 V

**Q.**

In the circuit shown in the adjacent figure, the batteries are ideal. The charge on the capacitor C is

10μ C

zero

20μ C

30μ C