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Electrical engineering > DC CIRCUITS > Flashcards

DC CIRCUITS Flashcards

1
Q
  1. The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in parallel and a potential difference is maintained across the combination. Then:

A. the current in 1 is twice that in 2
B. the current in 1 is half that in 2
C. the potential difference across 1 is twice that across 2
D. the potential difference across 1 is half that across 2

A

B. the current in 1 is half that in 2

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2
Q
  1. Which of the following is widely used as light metal?
    A. aluminum C. copper
    B. silver D. steel
A

A. Aluminum

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3
Q
  1. Current will take ____________ to return to the source.
    A. all available path
    B. only the least resistive path
    C. the path to the earth
    D. high resistive path only
A

A. All available path

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4
Q
  1. If the potential difference across a resistor is doubled:

A. only the current is doubled
B. only the current is halved
C. only the resistance is doubled
D. only the resistance is halved

A

A. only the current is doubled

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5
Q
  1. Which of the following is NOT a unit of work?
    A. N-m C. Erg
    B. Dyne D. Kg-sq. m/sq. sec
A

B. Dyne

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6
Q
  1. For any circuit the number of independent equations
    containing emf’s, resistances, and currents equals:

A. the number of junctions
B. the number of junctions minus 1
C. the number of branches
D. the number of branches minus 1

A

C. the number of branches

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7
Q
  1. Two wires made of the same material have the same lengths but different diameters. They are connected in series to a battery. The quantity that is the same for the
    wires is:

A. the end-to-end potential difference
B. the current
C. the current density
D. the electric field

A

B. the current

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8
Q
  1. The condition in Ohm’s law is that
    A. ratio V/I should he constant
    B. Current should be proportional to voltage
    C. The temperature should remain constant
    D. The temperature should vary.
A

C. The temperature should remain constant

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9
Q
  1. What is ACSR conductor stands for?
    A. Anodized Core Steel Reinforced
    B. Aluminum Cable Stranded Reinforced
    C. All conductor Surface reinforced
    D. Aluminum Conductor Steel Reinforced.
A

D. Aluminum Conductor Steel Reinforced

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10
Q
  1. The units of magnetic dipole moment are:
    A. Ampere
    B. Ampere•meter
    C. Ampere•meter^2
    D. Ampere/meter
A

C. Ampere•meter^2

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11
Q
  1. The equivalent wye element of a 3 equal resistor each equal to R and connected in delta is
    A. R
    B 3R/2
    C. R/3
    D. 3R
A

C. R/3

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12
Q

The rate at which electrical energy is used may be measured in:
A. watt/second
B. watt•second
C. watt
D. Joue•second

A

C. watt

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13
Q
  1. A device which connects conductor to the earth to discharge the charge on the conductor on the earth uw called?
    A. Grounding electrode
    B. Isolator
    C. Earthing switch
    D. Surge arrester
A

C. Earthing switch

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14
Q
  1. A short circuit has a resistance of
    A. Half-wave
    B. infinity
    C. Purely Resistive
    D. Zero
A

D. Zero

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15
Q
  1. The sum of the emf’s and potential differences around a closed loop equals zero” is a consequence of:
    A. Newton’s third law
    B. Ohm’s law
    C. Conservation of energy
    D. Conservation of charge
A

C. Conservation of energy

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16
Q
  1. If the volume if a confined gas is constant, the pressure is directly proportional to the absolute temperature. This is known as
    A. Kelvin’s Law
    B. Charles Law
    C. Boyle’s Law
    D. Joules Law
A

B. Charles Law

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17
Q
  1. The electrical analog of a spring constant k is:
    A. L
    B. 1/L
    C. C
    D. 1/C
A

D. 1/C

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18
Q
  1. Moving coil instruments are used
    A. In ac circuits only
    B. Both in ac and dc circuits
    C. In dc circuits only
    D. For measuring voltage only
A

C. In dc circuits only

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19
Q
  1. In the context of the loop and junction rules for electrical circuits a junction is:
    A. Where a wire is connected to a resistor
    B. Where a wire us connected to a battery
    C. Where only two wires are joined
    D. Where three or more wires are joined
A

D. Where three or more wires are joined

20
Q
  1. To make a galvanometer into an ammeter, connect:
    A. A high resistance in parallel
    B. A high resistance in series
    C. A low resistance in series
    D. A low resistance in parallel
A

D. A low resistance in parallel

21
Q
  1. Units of a magnetic field might be:
    A. C•m/s
    B. C•s/m
    C. C/kg
    D. kg/C•s
A

D. kg/C•s

22
Q
  1. 1 Weber is the same as:
    A. 1 V/s
    B. 1 T/s
    C. 1 T/m
    D. 1 T•m^2
A

D. 1 T•m^2

23
Q
  1. Heating effect of current has an undesirable side effect om
    A. Electric oven
    B. Immersion heater
    C. Electic iron
    D. Vacuum cleaner
A

D. Vacuum cleaner

24
Q
  1. Human body is
    A. Insulator
    B. Low resistive
    C. conductor
    D. electrolyte
A

C. conductor

25
Q
  1. Positive charge is distributed uniformly throughout a non conducting sphere. The highest electric potential occurs:
    A. At the center
    B. At the surface
    C. Halfway between the center and surface
    D. Just outside the surface
A

A. At the center

26
Q
  1. Which of the following is not a full- duplex?
    A. Radar
    B. Telephone
    C. Telemetry
    D. Local Area Network
A

C. Telemetry

27
Q
  1. What test is usually made on cables after installation?
    A. Copper losss test
    B. No-load test
    C. Insulation resistance test
    D. Ampacity test
A

C. Insulation resistance test

28
Q
  1. A test lamp using and ordinary bulb is use to test one of the following. Which one is this?
    A. Overload
    B. DC or AC check
    C. Polarity check
    D. Ground check
A

D. Ground check

29
Q
  1. A car battery is rated at 80A•h. An ampere-hour is a unit of:
    A. Power
    B. Energy
    C. Current
    D. Charge
A

D. Charge

30
Q
  1. A conducting connections, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.
    A. Grounded
    B. Ground
    C. Short
    D. Fault
A

B. Ground

31
Q
  1. Capacitor C1 and C2 are connected in parallel. The equivalent capacitance is given by:
    A. C1C2/(C1+C2)
    B. (C1 + C2)/C1C2
    C. 1/(C1 + C2)
    D. C1 + C2
A

D. C1 + C2

32
Q
  1. Conductivity is:
    A. The same as resistivity, it is just more convenient to use for good conductors
    B. Expressed in ohms^-1
    C. equal to 1/resistance
    D. Expressed in (Ohm•m)^-1
A

D. Expressed in (Ohm•m)^-1

33
Q
  1. The growth of current in an inductive circuit follows
    A. Linear law C. Ohm‟s law
    B. Exponential law D. Hyperbolic law
A

B. Exponential law

34
Q
  1. The substances which have a large number of free
    electrons are called
    A. insulators C. semi-conductors
    B. inductors D. conductors
A

D. conductors

35
Q
  1. If the voltage is doubled, the ampacity of a conductor
    A. increases C. doubles
    B. decreases D. remains the same
A

D. remains the same

36
Q
  1. The polarity of an unmarked magnet can be determined
    using:
    A. a charged glass rod
    B. a compass
    C. an electroscope
    D. another unmarked magnet
A

B. a compass

37
Q
    1. Of the following, the copper conductor that has the least
      resistance is:
      A. thin, long and hot C. thick, long and hot
      B. thick, short and cool D. thin, short and cool
A

B. thick, short and cool

38
Q
  1. “The sum of the emf’s and potential differences around a
    closed loop equals zero” is a consequence of:
    A. Newton’s third law
    B. Ohm’s law
    C. Newton’s second law
    D. conservation of energy
A

D. conservation of energy

39
Q
  1. The resistance of resistor 1 is twice the resistance of resistor
  2. The two are connected in series
    and a potential difference is maintained across the combination.
    Then:
    A. the current in 1 is twice that in 2
    B. the current in 1 is half that in 2
    C. the potential difference across 1 is twice that across 2
    D. the potential difference across 1 is half that across 2
A

C. the potential difference across 1 is twice that across 2

40
Q
  1. Two 110-V light bulbs, one “25W” and the other “100W”,
    are connected in series to a 110V source. Then:
    A. the current in the 100-W bulb is greater than that in the 25-
    W bulb
    B. the current in the 100-W bulb is less than that in the 25-W
    bulb
    C. both bulbs will light with equal brightness
    D. none of the above
A

D. none of the above

41
Q
  1. The capacitance of a parallel-plate capacitor is:
    A. proportional to the plate area
    B. proportional to the charge stored
    C. independent of any material inserted between the plat
A

A. proportional to the plate area

42
Q
  1. A single electrode consisting of a rod, pipe or plate shall
    have resistance to ground of _____ or less.
    A. 20 ohms C. 25 ohms
    B. 15 ohms D. 30 ohms
A

C. 25 ohms

43
Q
  1. The emf of a battery is equal to its terminal potential
    difference:
    A. under all conditions
    B. only when the battery is being charged
    C. only when a large current is in the battery
    D. only when there is no current in the battery
A

D. only when there is no current in the battery

44
Q
  1. A description of the arrangements of atoms or ions in a
    material is called _____.
    A. Mixture C. Component
    B. Composition D. Structure
A

D. Structure

45
Q
  1. Radio receivers are usually tuned by adjusting the capacitor of an LC circuit. If C = C1 for a frequency of 600 kHz, then for a frequency of 1200 kHz one must adjust C to:
    A. C√2
    B. C√4
    C. 2C1
    D. 4C1
A

B. C√4

46
Q
  1. An initially uncharged capacitor C is connected in series R. This combination is then connected to a battery of emf Vo. Sufficient time elapses so that a steady state is reached. Which of the following statements is not true?
    A. The time constant is independent of Vo
    B. The final charge on C is independent of R
    C. The total thermal energy generated by R is independent of R
    D. The total thermal energy generated by R is independent of Vo
A

C. The total thermal energy generated by R is independent of R

Electrical engineering (9 decks)

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