electricity basics mcq questions answers part2

Q1. For testing appliances, the wattage of test lamp should be
(A) low
(B) high
(C) very low
(D) any value

Q2. Ideal current source has
(A) Infinite input impedance
(B) Zero input impedance
(C) infinite conductance
(D) None

Q3. Ideal voltage source has
(A) Infinite input impedance
(B) Zero input impedance
(C) Medium input impedance
(D) None

Q4. If the circuit has resistors, capacitors and semi-conductor diodes, the circuit is
(A) non-linear circuit
(B) linear circuit
(C) bilateral circuit
(D) none of the above

Q5. If the distance between the plates of a capacitor decreases, what happens to the capacitance of the device?
(A) increases
(B) remains the same
(C) decreases
(D) varies

Q6. If the efficiency of a machine is to be high, which of the following should be low?
(A) Input power
(B) Losses
(C) output power
(D) Ratio of output to input

Q7. If the resistance decreases current through the resistor?
(A) increases
(B) remains unchanged
(C) decreases
(D) fluctuates

Q8. In a parallel circuit operating with a source of 30 VAC, designed to carry a total current of 6 A, what happens to the fuse when the resistance suddenly changes to 2Ω?
(A) closes
(B) no change
(C) opens
(D) Eplodes

Q9. In a parallel circuit operating with a source of 30 VAC, designed to carry a total current of 6 A, what happens to the fuse when the resistance suddenly changes to 2Ω?
(A) closes
(B) no change
(C) opens
(D) Eplodes

Q10. In an AC circuit capacitive reactance 50Ω, the inductive reactance 30Ω and the resistance 100Ω connected in series. Determine the type of the circuit?
(A) resistive
(B) inductive
(C) capacitive
(D) resonant

Q11. In any linear bilateral network, if a source of EMF in any branch produces a current I in any other branch, then same EMF acting in the second branch would produce the same current in the first branch. The above statement is associated with which of the theorems
(A) compensation theorem
(B) superposition theorem
(C) reciprocity theorem
(D) none of the above

Q12. In which manner a fuse can be installed in a circuit?
(A) parallel to the load
(B) series with the load
(C) in any way possible
(D) None of these

Q13. Kirchhoffs voltage law is related to
(A) junction currents
(B) IR drops
(C) battery EMFs
(D) both B and C

Q14. Ohms law is not applicable to
(A) DC circuits
(B) semi conductors
(C) small resistors
(D) high currents

Q15. Superposition theorem can be applied only to circuits having
(A) non-linear elements
(B) linear bilateral elements
(C) resistive elements
(D) passive elements

Q16. Superposition theorem can be applied only to circuits having
(A) resistive elements
(B) passive elements
(C) non-linear elements
(D) linear bilateral elements

Q17. The Superposition theorem is based on
(A) reciprocity
(B) duality
(C) non-linearity
(D) linearity

Q18. The efficiency of a transformer will be maximum when
(A) copper losses = iron losses
(B) copper losses = hysteresis losses
(C) hysteresis losses = eddy current losses
(D) eddy current losses = copper losses

Q19. The resistance of a conductor varies inversely with
(A) temperature
(B) area of cross-section
(C) length
(D) resistivity

Q20. Three resistors of values 60, 40 and 35 connected across a 50-V source, what is the approximate amount of heat produced?
(A) 13.6 W
(B) 18.5 W
(C) 135 W
(D) 100 W