A dynamo converts
Options
(a) mechanical energy into thermal energy (b) electrical energy into thermal energy (c) thermal energy into electrical energy (d) mechanical energy into electrical energy
Correct Answer:
mechanical energy into […]
A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance 10Ω. If a frequency AC source is varied, then what is the frequency at which maximum power is dissipated?
Options
A condenser of 250 μF is connected in parallel to a coil of inductance of 0.16 mH, while its effective resistance is 20Ω. Determine the resonant frequency.
Options
(a) 9×10⁴ Hz (b) 16×10⁷ […]
A current of 5 A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200 V and 50% of power is lost, then […]
10 mA current can pass through a galvanometer of resistance 25 ohm. What resistance in series should be connected through it, so that it is converted into a voltmeter of 100V?
Options
(a) […]
Alternating current cannot be measured by D.C Ammeter because
Options
(a) A.C cannot pass through D.C Ammeter (b) A.C changes direction (c) Average value of current for complete cycle is zero (d) D.C […]
In an A.C circuit of capacitance the current from potential is
Options
(a) in same phase (b) in opposite phase (c) backward (d) forward
Correct Answer:
forward
Explanation:
No explanation available. Be the […]
In a pure capacitive A.C circuit, current and voltage differ in phase by
Options
(a) 0° (b) 45° (c) 90° (d) 180°
Correct Answer:
90°
Explanation:
No explanation available. Be the first to […]
If the value of potential in an A.C circuit is 10 V, the peak value of potential is
Options
(a) 10 / √2 V (b) 20 / √2 V (c) 10 √2 V […]
Energy stored in the coil of a self inductance 40 mH carrying a steady current of 2A is
Options
(a) 0.8 J (b) 0.08 J (c) 8 J (d) 80 J
Correct Answer: […]
2017 Copyright Doctor Dreams Training Academy