EE SET 1 Flashcards
The voltage applied across an electric press was reduced by 50%. The power consumed by the press will be reduced by
A. 75%
B. 60%
C. 25%
D. 50%
75%
The current flowing in L and C at parallel resonance are
A. equal
B. different
C. infinite
D. zero
equal
Resistor 1 has twice the resistance of resistor 2. They are connected in parallel to a battery. Find the ratio of the thermal energy generation rate in resistor 1 to that in resistor 2.
A. 4:1
B. 2:1
C. 1:4
D. 1:2
1:2
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 half that across 2
D. the potential difference across 1 is twice that across 2
the potential difference across 1 is twice that across 2
The power lost is MORE consider in the design of
A. the transmission line
B. a motor
C. the feeder
D. a generator
the transmission line
An RLC series circuit, connected to a source E, is at resonance. Then:
A. the voltage across C is zero
B. the voltage across R is zero
C. the voltage across R equals the applied voltage
D. the voltage across L equals the applied voltage
the voltage across R equals the applied voltage
When electrons build up pressure at one point, it is called
A. impedance
B. current flow
C. ganging
D. pressure filing
current flow
___ is a process by which atoms are split apart to release energy.
A. Fusion
B. Fission
C. Nuclear Spitting
D. Carburizing
Fission
In a capacitor start motor, the capacitor is replaced by an inductor having the same reactance as in capacitor. Then the motor will
A. start but run at a slow speed
B. start and run at its rated speed
C. not start
D. be damaged
not start
A magnetic field exerts a force on a charged particle:
A. if the particle is moving across the field lines
B. if the particle is moving along the field lines
C. always
D. never
if the particle is moving across the field lines
When the frequency of the oscillator in a series RLC circuit is doubled:
A. the capacitive reactance is doubled
B. the capacitive reactance is halved
C. the impedance is doubled
D. the current amplitude is doubled
the capacitive reactance is halved
Overhead transmission lines are protected from lightning with the use of which? I. Overhead grounding conductor II. Surge arrestors
A. neither I nor II
B. II only
C. either I or II
D. I only
either I or II
For remote operation, which of the following a circuit breaker must be equipped with?
A. Time - delay
B. Very inverse time
C. Shunt
D. Inverse time
shunt
Guy wire is used in the construction of distribution lines for what purpose?
A. supporting the pole
B. protection against surges
C. providing emergency grounding
D. support the conductor
supporting the pole
The magnetic field B inside a long ideal solenoid is independent of:
A. the core material
B. the cross-sectional area of the solenoid
C. the spacing of the windings
D. the current
the cross-sectional area of the solenoid
In a purely capacitive circuit the current:
A. leads the voltage by one-fourth of a cycle
B. lags the voltage by one-half of a cycle
C. leads the voltage by one-half of a cycle
D. lags the voltage by one-fourth of a cycle
leads the voltage by one-fourth of a cycle
An A.C.S.R conductor having 7 steel strands surrounded by 24 aluminum conductors will be specified as
A. 7/24
B. 24/7
C. 31/7
D. 7/31
24/7
Two wires made of the same material have the same lengths but different diameters. They are connected in parallel to a battery. The quantity that is NOT the same for the wires is:
A. the current
B. the current density
C. the electric field
D. the end-to-end potential difference
the current
What extends the range of a dc ammeter?
A. shunt resistance
B. inductance
C. current transformer
D. capacitor
shunt resistance
What is the maximum output power of a cellular transmitter?
A. 3 W
B. 4.5 W
C. 1.5 W
D. 6 W
3 W
One primary and one secondary terminal of a two-winding transformer are connected to an ohm-meter instrument. What will be the reading on this instrument?
A. Zero
B. Zero or infinity
C. Infinity
D. Equal to winding resistance
Infinity
The unit “henry” is equivalent to:
A. ohm
B. volt ⋅ second/ampere
C. ampere ⋅ volt/second
D. volt/second
volt ⋅ second/ampere
______________ first computer designed and primarily used to calculate artillery firing tables for the United States Army’s Ballistic Research Laboratory In 1945.
A. ASUS ROG
B. LENOVO YOGA
C. APPLE
D. ENIAC
ENIAC
What device is used to determine hotspots?
A. Thermal Scanner
B. Matamometer
C. Thermometer
D. Hi-pot Tester
Thermal Scanner
When the amplitude of the oscillator in a series RLC circuit is doubled, the _________.
A. impedance is doubled
B. capacitor reactance is halved
C. voltage across the capacitor is halved
D. current amplitude is doubled
current amplitude is doubled
When the voltage remains the same, the current will ____ as the impedance decreases. I. decrease II. increase
A. I only
B. II only
C. Both
D. Either I or II
II only
The overcurrent protective device is caused to operate by ______.
A. impedance
B. Voltage drop
C. Voltage surge
D. current flow
current flow
Which of the following power plant in a NON-Renewable Energy?
A. Wind energy
B. Geothermal energy
C. Nuclear energy
D. Solar energy
Nuclear energy
Which statement is true?
A. Magnetic flux lines have sources only
B. Magnetic flux lines have sinks only
C. Magnetic flux lines does not have sources and sinks
D. Magnetic flux lines have both sources and sinks
Magnetic flux lines does not have sources and sinks
Which of the following is a primary disadvantage of AM over FM?
A. Noise susceptibility
B. Excessive use of spectrum space
C. Higher cost and complexity
D. Lower efficiency
Noise susceptibility
Iron, rather than copper, is used in the core of transformers because iron:
A. makes a good permanent magnet
B. can withstand a higher temperature
C. has a greater resistivity
D. has a very high permeability
has a very high permeability
A copper rod has resistance R. It is reinforced to half its original length and half its diameter. What is the new resistance?
A. 1/2 R
B. 4R
C. 2R
D. R
2R
The purpose of using capacitor is to: I. Improve voltage II. Reduce technical losses
A. II only
B. Neither I and II
C. Both I and II
D. I only
Both I and II
Which of the following is a valid disadvantage of Sulphur Hexafluoride circuit breaker?
A. Operation is noisy
B. High maintenance
C. Arced gas is poisonous
D. Gas is flammable
Arced gas is poisonous
In a purely resistive circuit the current:
A. leads the voltage by one-fourth of a cycle
B. lags the voltage by one-fourth of a cycle
C. is in phase with the voltage
D. leads the voltage by one-half of a cycle
is in phase with the voltage
The boundary of the protection system is determined by the location of
A. current transformers
B. circuit breakers
C. voltage transformers
D. Protective relays
current transformers
Differential relays are used to protect the transformer against
A. Reverse current
B. No voltage
C. Internal faults
D. Overcurrents
Internal Faults
For an unbalanced load, which is the most suitable connection?
A. 3-wire wye connection
B. 3-wire delta connection
C. 3-wire open delta
D. 4-wire wye connection
4-wire wye connection
If R is the distance from a magnetic dipole, then the magnetic field it produces is proportional to:
A. R
B. 1/R^3
C. 1/R
D. R^2
1/R^3
A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the energy stored in the electric field of the capacitor is a maximum is:
A. T/2
B. T/4
C. 2T
D. T
T/2
Diesel power plant is best suited as
A. Peak load
B. Standby
C. General Purpose
D. Base Load
Standby
Two resistors are connected in parallel across a potential difference. The resistance of resistor A is twice that of resistor B. If the current carried by resistor A is I, then what is the current carried by B?
A. 4I
B. 2I
C. I
D. I/2
2I
The rating of a circuit breaker is generally determined on the basis of
A. Single line to ground fault current
B. Symmetrical fault current
C. Line-to-line fault current
D. Double line to ground fault current
Symmetrical fault current
Which of the following is NOT a reason why single-phase induction motor run?
A. hysteresis
B. Cone of the current is made out of phase between the lines
C. two windings are displaced from each other
D. shaded poles
hysteresis
The terminal potential difference of a battery is less than its emf:
A. only when the battery is being charged
B. under all conditions
C. only when there is no current in the battery
D. only when the battery is being discharged
only when the battery is being discharged
The undervoltage relays are usually used for what protection of the electrical equipment?
A. feeder protection
B. transformer protection
C. bus-bar protection
D. motor protection
motor protection
What type of transformer bank is used to convert 2-phase to 3-phase power?
A. scott-T
B. open-delta
C. delta-wye
D. wye-delta
scott-T
A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the energy stored in the magnetic field of the inductor is a maximum is
A. T/4
B. T
C. 2T
D. T/2
T/4
For any circuit, the number of independent equations containing emf’s, resistances and currents equals:
A. the number of branches minus 1
B. the number of branches
C. the number of junctions minus 1
D. the number of junctions
the number of branches
Its primary function is to provide ground source.
A. tertiary transformer
B. sectionalizer
C. zig-zag transformer
D. surge arrester
zig-zag transformer
AC Directional Overcurrent relay is designated as number
A. 51
B. 87
C. 52
D. 67
67
An electric field is associated with every:
A. magnetic field
B. object moving in a magnetic field
C. time-dependent magnetic field
D. time-dependent magnetic flux
time-dependent magnetic field
GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the grid to the PGC. What does GMC stands for?
A. Grid Market Commission
B. Generation Management Corporation
C. Generator Management Committee
D. Grid Management Committee
Grid Management Committee
The time constant RC has units of:
A. second/farad
B. second/ohm
C. none of these
D. 1/second
none of these
Which of the following transformer has only one winding?
A. current
B. distribution
C. autotransformer
D. power
autotransformer
What device is used to measure the temperature of a motor winding while the motor is in operation?
A. Thermocouples
B. Seismic probe
C. Proximity probe
D. Resistance temperature detector
Resistance temperature detector
The condition in Ohm’s law is that
A. ratio V/I should be constant
B. the temperature should remain constant
C. current should be proportional to voltage
D. the temperature should var
the temperature should remain constant
The rms value of an ac current is:
A. that steady current that produces the same rate of heating in a resistor as the actual current
B. that steady current that will charge a battery at the same rate as the actual current
C. its average value
D. its peak value
that steady current that produces the same rate of heating in a resistor as the actual current
For a transmission line terminated in its characteristic impedance, which of the following statement is incorrect:
A. Standing wave does not exist.
B. Efficiency of transmission of power is maximum
C. The energy distribution between magnetic and electric field is not equal.
D. It is a smooth line.
The energy distribution between magnetic and electric field is not equal.
To adjust the power of the alternator, adjust the _________.
A. frequency
B. field current
C. governor
D. power factor
governor
What contains in each cell site of cellular telephone system?
A. Control computer
B. Repeater
C. Touch-tone processor
D. Direct-link to a branch exchange
Repeater
Compared to Gauss-Seidel, Newton-Raphson method takes
A. Less number of iterations and more time per iteration
B. More number of iterations and more time per iteration
C. More number of iterations and less time per iteration
D. Less number of iterations and less time per iteration
Less number of iterations and more time per iteration
A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the current is a maximum is:
A. 2T
B. T
C. T/4
D. T/2
T/4
The dc armature winding in which the coil sides are placed a pole pitch apart is called ___ winding.
A. Fractional pitch
B. Pole-pitch
C. Multiplex
D. Full-pitch
Full-pitch
For a loop of current-carrying wire in a uniform magnetic field the potential energy is a minimum if the magnetic dipole moment of the loop is:
A. perpendicular to the field
B. in the direction opposite to that of the field
C. in the same direction as the field
D. at an angle of 45 degree to the field
in the same direction as the field
Which of the following protects a cable against mechanical injury during handling and laying?
I. Armouring
II. Bedding
A. II
B. Both I and II
C. Either I or II
D. I
I
