26. Which is the best conductor of electricity ?
(a) Iron
(b) Silver
(c) Copper
(d) Carbon
Ans: b
27. For which of the following ‘ampere second’ could be the unit ?
(a) Reluctance
(b) Charge
(c) Power
(d) Energy
Ans: b
28. All of the following are equivalent to watt except
(a) (amperes) ohm
(b) joules/sec.
(c) amperes x volts
(d) amperes/volt
Ans: d
29. A resistance having rating 10 ohms, 10 W is likely to be a
(a) metallic resistor
(b) carbon resistor
(c) wire wound resistor
(d) variable resistor
Ans: c
30. Which one of the following does not have negative temperature coefficient
?
(a) Aluminium
(b) Paper
(c) Rubber
(d) Mica
Ans: a
31. Varistors are
(a) insulators
(6) nonlinear resistors
(c) carbon resistors
(d) resistors with zero temperature coefficient
Ans: b
32. Insulating materials have the function of
(a) preventing a short circuit between conducting wires
(b) preventing an open circuit between the voltage source and the load
(c) conducting very large currents
(d) storing very high currents
Ans: b
33. The rating of a fuse wire is always expressed in
(a) amperehours
(b) amperevolts
(c) kWh
(d) amperes
Ans: d
34. The minimum charge on an ion is
(a) equal to the atomic number of the atom
(b) equal to the charge of an electron
(c) equal to the charge of the number of electrons in an atom (#) zero
Ans: b
35. In a series circuit with unequal resistances
(a) the highest resistance has the most of the current through it
(b) the lowest resistance has the highest voltage drop
(c) the lowest resistance has the highest current
(d) the highest resistance has the highest voltage drop
Ans: d
36. The filament of an electric bulb is made of
(a) carbon
(b) aluminium
(c) tungsten
(d) nickel
Ans: c
37. A 3 Q resistor having 2 A current will dissipate the power of
(a) 2 watts
(b) 4 watts
(c) 6 watts
(d) 8 watts
Ans: c
38. Which of the following statement is true?
(a) A galvanometer with low resistance in parallel is a voltmeter
(b) A galvanometer with high resistance in parallel is a voltmeter
(c) A galvanometer with low resistance in series is an ammeter
(d) A galvanometer with high resistance in series is an ammeter
Ans: c
39. The resistance of a few meters of wire conductor in closed electrical circuit is
(a) practically zero
(b) low
(c) high
(d) very high
Ans: a
40. If a parallel circuit is opened in the main line, the current
(a) increases in the branch of the lowest resistance
(b) increases in each branch
(c) is zero in all branches
(d) is zero in the highest resistive branch
Ans: c
41. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
(a) 0.4 ohm
(b) 0.6 ohm
(c) 0.8 ohm
(d) 1.0 ohm
Ans: a
42. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
(a) there will be heavy current in the main line
(b) rest of the two bulbs will not light
(c) all three bulbs will light
(d) the other two bulbs will light
Ans: d
43. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true ?
(a) The current through each bulb in same
(b) The voltage across each bulb is not same
(c) The power dissipation in each bulb is not same
(d) None of the above
Ans: a
44. Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across
(a) Rl
(b) Ri
(c) either Rl or Ri
(d) none of them
Ans: a
45. What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal (a) 5 joules
(b) 10 joules
(c) 15 joules
(d) 20 joules
Ans:
46. A closed switch has a resistance of
(a) zero
(b) about 50 ohms
(c) about 500 ohms
(d) infinity
Ans: a
47. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature coefficient
of the filament is
(a) zero
(b) negative
(c) positive
(d) about 2 ohms per degree
Ans: c
48. Heat in a conductor is produced on the passage of electric current due to
(a) reactance
(b) capacitance
(c) impedance
(d) resistance
Ans:
49. The insulation on a current carrying conductor is provided
(a) to prevent leakage of current
(b) to prevent shock
(c) both of above factors
(d) none of above factors
Ans: c
50. The thickness of insulation provided on the conductor depends on
(a) the magnitude of voltage on the conductor
(b) the magnitude of current flowing through it
(c) both (a) and (b)
(d) none of the above
Ans: a
Share : BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 2
Related Posts
BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 3
51. Which of the following quantities remain the same in all parts of a series circuit ?
(a) Voltage
(b) Current
(- BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 4
76. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of t
- BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 5
101. A rheostat differs from potentiometer in the respect that it
(a) has lower wattage rating
(b) has higher watta
BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 2
4/
5
Oleh
TNPSC Master
0 comments : BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 2
0 comments : BSNL TTA Junior Engineers Model Question in Electrical Engineering Part - 2