Current Electricty Mcq For Electrical Engineering
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Current Electricty Mcq For Electrical Engineering
21. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is
- (A) 5 ohms
- (B) 10 ohms
- (C) 15 ohms
- (D) 55 ohms
Show Answer
(A) 5 ohms
22. The resistance of two wires is 25 ohms when connected in series and 6 ohms when joined in parallel. The resistance of each wire is
- (A) 10 ohms 15 ohms
- (B) 20 ohms 30 ohms
- (C) 5 ohms 10 ohms
- (D) 10 ohms 20 ohms
Show Answer
(A) 10 ohms 15 ohms
23. An instrument which detects electric current is known as
- (A) voltmeter
- (B) rheostat
- (C) wattmeter
- (D) galvanometer
Show Answer
(D) galvanometer
24. In a circuit a 33Ω resistor carries a current of 2 A. The voltage across the resistor is
- (A) 33 V
- (B) 66 V
- (C) 80 V
- (D) 132 V
Show Answer
(B) 66 V
25. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
- (A) 400Ω
- (B) 600Ω
- (C) 800Ω
- (D) 1000Ω
Show Answer
(C) 800Ω
26. The resistance of a parallel circuit con-sisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
- (A) 18Ω
- (B) 36Ω
- (C) 48Ω
- (D) 64Ω
Show Answer
(B) 36Ω
27. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25Ω. If the same four wires are connected is series the effective resistance will be
- (A) 1Ω
- (B) 2Ω
- (C) 3Ω
- (D) 4Ω
Show Answer
(D) 4Ω
28. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is
- (A) 6.4A, 6.9A (
- (B) 6.4A, 9.6A
- (C) 4.6A, 6.9A
- (D) 4.6A, 9.6A
Show Answer
(B) 6.4A, 9.6A
29. Current velocity through a copper con-ductor is
- (A) the same as propagation velocity of electric energy
- (B) independent of current strength
- (C) of the order of a few us/m
- (D) None
Show Answer
(C) of the order of a few us/m
30. Which of the following material has nearly zero temperature co-efficient of resistance ?
- (A) Manganin
- (B) Porcelain
- (C) Carbon
- (D) Copper
Show Answer
(A) Manganin
31. You have to replace 1500Ω resistor in radio. You have no 1500Ω resistor but have several 1000Ω ones which you would connect
- (A) two in parallel
- (B) two in parallel and one in series
- (C) three in parallel
- (D) three in series
Show Answer
(B) two in parallel and one in series
32. Two resistors are said to be connected in series when
- (A) same current passes in turn through both
- (B) both carry the same value of current
- (C) total current equals the sum of branch currents
- (D) sum of 1R drops equals the applied e.m.f.
Show Answer
(A) same current passes in turn through both
33. which of following statement is true both for a series and a parallel D.C. circuit ?
- (A) Elements have individual currents
- (B) Currents are additive
- (C) Voltages are additive
- (D) Power are additive
Show Answer
(D) Power are additive
34. Which of the following materials has a negative temperature co-efficient of reelslance ?
- (A) Copper
- (B) Aluminum
- (C) Carbon
- (D) Brass
Show Answer
(C) Carbon
35. Ohm's law is not applicable to
- (A) vacuum tubes
- (B) carbon resistors
- (C) high voltage circuits
- (D) circuits with low current densities
Show Answer
(A) vacuum tubes
36. Which is the best conductor of electricity ?
- (A) Iron
- (B) Silver
- (C) Copper
- (D) Carbon
Show Answer
(B) Silver
37. For which of the following 'ampere second' could be the unit ?
- (A) Reluctance
- (B) Charge
- (C) Power
- (D) Energy
Show Answer
(B) Charge
38. All of the following are equivalent to watt except
- (A) (amperes)2 ohm
- (B) joules/sec
- (C) amperes x volts
- (D) amperes/volt
Show Answer
(D) amperes/volt
39. A resistance having rating 10 ohms, 10W is likely to be a
- (A) metallic resistor
- (B) carbon resistor
- (C) wire wound resistor
- (D) variable resistor
Show Answer
(C) wire wound resistor
40. Which one of the following does not have negative temperature co-efficient ?
- (A) Aluminium
- (B) Paper
- (C) Rubber
- (D) Mica
Show Answer
(A) Aluminium
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