1. Kirchhoffs Voltage Law (KVL) is a restatement of:
2. If the number of turns of a coil is doubled, its inductance :
3. Two batteries having emfs of 10 V and 7 V and internal resistances 2 Ω and 3 Ωrespectively are connected in parallel across a load of resistance of 1 Ω. The current drawn by the load is :
4. A square coil of 10 cm side and with 100 turns is rotated at a uniform speed of 1000 revolutions per minute about an axis at right angles to a uniform magnetic field having a flux density of 0.5 wb/m2. The instantaneous value of induced emf when the plane of the coil is parallel to the plane of the field is :
5. In an RLC series circuit, voltage in the circuit is : R=20Ω, XL =4Ω and Xc = 6Ω. The current is 5 A. The applied
6. A current of 10 A flows in a circuit with 30° angle of lag when the applied voltage is 100 V. The resistance, reactance and impedance are :
7. A wire is placed parallel to the lines of force in a magnetic field and a current flows in this wire. Then :
8. If a 10 Ω resistance is connected to an a.c. supply v = 100sin(314t+37) V, the power dissipated by the resistance is :
9. A three phase, four wire 100 V (L-L) system supplies a balanced star connected load having impedance of 10l-30 Ω in each phase. How much current is flowing through the neutral?
10. If To is the torque and /a the armature current for a DC series motor, which of the following relation is valid, after core saturation?1
11. The permissible flux density of cold rolled grain oriented steel used for transformer core is around :
12. The nameplate of an energy meter reads 1 KWh = 15,000 revolutions’. If the meter completes 150 revolutions during 50 seconds, what is the power in the circuit?
13. An ammeter with full scale deflection current of 100 A (micro ampere) and internal resistance of 100 is required to measure a maximum current of 10 maA. The shunt resistance value is:
14. If the moving coil of a voltmeter consists of 100 turns around on a square former which has a length of 30 mm and flux density in the air gap is 0.09 wb/m2. The deflecting torque on the coil when carrying a current of 10 mA is :
15. A 5 A. 230 V meter on full load, unity power factor test makes 72 revolutions in 360 seconds If the normal disc speed is 600 rev/KWh, what is the percentage error?
16. In a moving iron instrument, the deflection torque, Td is :
17. Inductance affects the direct current (d.c.) flow :
18. For a sine wave with peak value Emax, the average value is :
19. The ratio of starting torque to full load torque is least in :
20. The iron core from an iron-cored coil is removed so that it becomes air-cored. The inductance of the coil:
21. The forbidden energy band gap for Germanium is :
22. When the reverse bias is applied to a junction diode :
23. In a full-wave rectifier which uses two ideal diodes, the approximate relationship are :
24. 24.A forward biased silicon diode when carrying a negligible current has a voltage drop of 0.65 V.when the current through the diode is increased to 1A,it dissipates 500 mW.The ON- resistance of the diode is:
25. Which of the following statement is correct for the basic transistor configurations?
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