Departmental (other) • 2024 • Engineering Paper-II
The capacitance of a transmission line is neglected in case of
A)
medium line
B)
long line
C)
short line
D)
extra long line
Option C is correct: short line.
Departmental (other) • 2024 • Engineering Paper-II
For a sine wave with peak value Vm, the r.m.s value is
A)
0.8181 Vm
B)
0.7071 Vm
C)
0.51 Vm
D)
1.4141 Vm
Option B is correct: 0.7071 Vm.
Departmental (other) • 2024 • Engineering Paper-II
The resistance of a straight conductor is independent of
A)
temperature
B)
material
C)
cross-sectional area
D)
shape of cross-section
Option D is correct: shape of cross-section.
Departmental (other) • 2024 • Engineering Paper-II
The supply voltage of a consumer is 220VAC and his internal wiring is protected by 9A fuse. How many 60W bulb in parallel can be turned on simultaneously without breaking the fuse?
A)
33 nos
B)
44 nos
C)
22 nos
D)
20 nos
Option A is correct: 33 nos.
Departmental (other) • 2024 • Engineering Paper-II
The e.m.f induced in a coil of N turns is given by
A)
dΦ/dt
B)
NdΦ/dt
C)
-NdΦ/dt
D)
Ndt/dΦ
Option C is correct: -NdΦ/dt.
Departmental (other) • 2024 • Engineering Paper-II
Mutual inductance between two coils can be decreased by
A)
increasing the number of turns in either coils
B)
moving the coils closer
C)
moving the coils apart
D)
none of the above
Option C is correct: moving the coils apart.
Departmental (other) • 2024 • Engineering Paper-II
The function of a filter circuit in a power supply is to
A)
limit the current in the rectifier
B)
limit the peak voltage of the rectifier
C)
separate a.c and d.c component of the rectified voltage
D)
limit the power of the rectifier
Option C is correct: separate a.c and d.c component of the rectified voltage.
Departmental (other) • 2024 • Engineering Paper-II
Corona effect
A)
produces ozone gas
B)
reduces transmission efficiency
C)
causes line to draw non-sinusoidal current
D)
all the above
Option D is correct: all the above.
Departmental (other) • 2024 • Engineering Paper-II
The frequency of e.m.f. generated in an 8 pole alternator running at 900 r.p.m is
A)
50Hz
B)
60 Hz
C)
120Hz
D)
140 Hz
Option A is correct: 50Hz.
Departmental (other) • 2024 • Engineering Paper-II
The skin effect increases the
A)
resistance of the line
B)
inductance of the line
C)
capacitance of the line
D)
inductance and capacitance line
Option A is correct: resistance of the line.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
Corona effect can be reduced by-
A)
increasing conductor size
B)
decreasing conductor size
C)
decreasing conductor spacing
D)
increasing conductor spacing
Option A is correct: increasing conductor size.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
In a Thyristor the magnitude of anode current will-
A)
increase if gate current is increased
B)
not change with variation of gate current
C)
decrease if gate current is decreased
D)
increase if gate current is decreased
Option A is correct: increase if gate current is increased.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
The advantage of star-connected supply system over delta connected is that-
A)
line current is equal to phase current
B)
two voltages can be used
C)
phase sequence can easily be changed
D)
it is a simple arrangement
Option B is correct: two voltages can be used.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
When 3-phase system is balanced, the neutral wire carries-
A)
no current
B)
one-third of current for each phase
C)
half of current for each phase
D)
one-fourth of current for each phase
Option A is correct: no current.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
Total minimum number of discs in a string of 120kN porcelain insulators for 132kV AC overhead transmission line is-
A)
3
B)
6
C)
8
D)
10
Option D is correct: 10.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
Which of the following circuit element stores energy in the electromagnetic field?
A)
resistance
B)
variable resistor
C)
condenser
D)
inductance
Option D is correct: inductance.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
The capacitance of a capacitor is ____ relative permittivity.
A)
directly proportional to
B)
inversely proportional to
C)
independent of
D)
directly proportional to square of
Option A is correct: directly proportional to.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
The magnitude of e.m.f generated by an alternator depends on-
A)
number of poles
B)
rotor speed
C)
flux per pole
D)
all of the above
Option D is correct: all of the above.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
Which of the following statement is not among the law of resistance?
A)
resistance varies directly as the length of conductor
B)
resistance varies inversely as the cross sectional area of the conductor
C)
resistance depends on the temperature of the conductor
D)
resistance depends on the type of current flowing in the conductor
Option D is correct: resistance depends on the type of current flowing in the conductor.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
A generator produces 100kW of power at a potential difference of 10kV. The power is transmitted through cables of total resistance 5Ω. What is the power loss in cables?
A)
1000 W
B)
500 W
C)
250W
D)
50W
Option B is correct: 500 W.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
For the same resistance per unit length, cross-sectional area of aluminium conductor has to be ____ times that of copper conductor.
A)
15
B)
1.6
C)
1.8
D)
2.0
Option C is correct: 1.8.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
A kilowatt hour is the unit of-
A)
energy
B)
power
C)
electric charge
D)
electric current
Option A is correct: energy.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
A full-wave rectifier is as effective as a half-wave rectifier.
A)
twice
B)
thrice
C)
two and half times
D)
four times
Option A is correct: twice.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
Two capacitors of capacitances C1 and C2 are connected in parallel. A charge Q given to them is shared. The ratio of charges Q1/Q2 is-
A)
C1/C2
B)
C2/C1
C)
C1C2/1
D)
1/C1C2
Option A is correct: C1/C2.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
When two resistors are connected in series-
A)
they both must have the same resistance value.
B)
the voltage across each must be the same.
C)
they must have same resistivity
D)
there is only one path for current through both resistors
Option D is correct: there is only one path for current through both resistors.
