1. A 24V battery of internal resistance 4ohms is connected to variable resistance R the rate of heat dissipated in the resistor is maximum when the current drawn from the battery is I. The current drawn from the battery will be (I/2) when R is equal to
Answer : 12 ohms
Explain:-
2. A battery is connected to a resistance causing a current of 0.5A in the circuit.Thec current drops to 0.4A when additional resistance 5ohms is connected in series.The current drops to 0.2A when the resistance is
Answer : 30 Ω
Explain:-
3. Superposition theorem is not applicable to
Answer : power calculations
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4. A load is connected to an active network. At the terminals to which the load is connected Rth=10ohms,Vth=60v. The maximum power supplied to the load is
Answer : 90W
Explain:-
5. Which of the following is not a conducting material
Answer : germanium
Explain:-
6. For an insulating material, dielectric strength and dielectric loss should be respectively
Answer : High and low
Explain:-
7. Which one of the following have highest dielectric strength
Answer : polystyrene
Explain:-
8. Armature core of DC machine is laminated to reduce
Answer : Eddy current loss
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9. A shunt generator has a critical field resistance of 200ohms at a speed of 800rpm .If the speed of the generator is increased to 1000rpm what is the change in the critical field resistance of the generator
Answer : increase to 250 ohms
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10. The overall efficiency of DC shunt generator is maximum when the variable loss is equal to
Answer : the constant loss
Explain:-
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