Q1. A 100 V voltage source has a source resistance, RS, of 50 . The equivalent current source is
(A) 1A
(B) 2A
(C) 2 mA
(D) 1 mA
Answer: 2A
Explanation: I=V/R, 100/50=2A
Q2. A 1K load resistor, RL, is connected across a constant current source of 1.1 The internal source resistance, RS, is 10 k. The load current, RL, is
(A) 0A
(B) 1.0 A
(C) 1.1A
(D) 2A
Answer: 1.0 A
Explanation: A practical current source is represented by a current source in parallel with a high resistance, therefore the load resistor is parallel with the internal resistance. As per current division rule to find current in any branch formula, I = (Current*Resistance of opposite branch)/Total resistance of the two branches. I = (1.1*10 k)/(10 k + 1k). I = 1 A.
Q3. A capacitor is generally a
(A) bilateral and active component
(B) linear and bilateral component
(C) non-linear and active component
(D) active, passive, linear and nonlinear component
Answer: linear and bilateral component
Explanation:
Q4. A transformer transforms
(A) current
(B) voltage
(C) power
(D) both voltage and current
Answer: both voltage and current
Explanation: Transformer basically transforms voltage, but there are current transformer too. Transformer does not effect frequency and power
Q5. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and EMFs in any closed loop of a network is always
(A) zero
(B) negative
(C) positive
(D) determined by EMFs
Answer: zero
Explanation:
Q6. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always
(A) negative
(B) positive
(C) determined by battery e.m.fs.
(D) zero
Answer: zero
Explanation:
Q7. An electric filament bulb can be worked from:
(A) DC supply only
(B) AC supply only
(C) Battery supply only
(D) All are correct
Answer: All are correct
Explanation:
Q8. An ideal voltage source is one which has
(A) large value of EMF
(B) small value of EMF
(C) zero source resistance
(D) infinite source resistance
Answer: zero source resistance
Explanation:
Q9. An ideal voltage source should have
(A) zero source resistance
(B) small value of source resistance
(C) large value of source resistance
(D) infinite source resistance
Answer: zero source resistance
Explanation:
Q10. Another name of Electric pressure
(A) current
(B) voltage
(C) power
(D) energy
Answer: voltage
Explanation:
Q11. Application of Nortons theorem to a circuit gives
(A) equivalent impedance
(B) equivalent current source and impedance in parallel
(C) equivalent current source and impedance in series
(D) equivalent current source
Answer: equivalent current source and impedance in parallel
Explanation:
Q12. At any linear network,any two terminals a,b can be reduced to current source Isc with parallel impedance Zth.This theorm is
(A) nortons theorm
(B) superposition theorm
(C) thevenins theorm
(D) network theorm
Answer: nortons theorm
Explanation:
Q13. Bulbs in street lighting are all connected in
(A) series
(B) parallel
(C) series or parallel
(D) None of these
Answer: parallel
Explanation: Not only street light,but all lights whichever you are seeing in a house or an industries are connected in Parallel, because if we connect it in series Voltage across each light will drop,hence it will glow less than its rated lumen. So to maintain rated Voltage across each light we have to connect it in parallel.
Q14. Efficiency when maximum power is transferred to the load
(A) 100.00%
(B) 80.00%
(C) 75.00%
(D) 50.00%
Answer: 50.00%
Explanation:
Q15. Electric current passing through the circuit produces
(A) luminous effect
(B) motion effect
(C) thermal effect
(D) chemical effect
Answer: thermal effect
Explanation:
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