Departmental (other) • 2024 • Engineering Paper-II
If RL of Figure is the load resistance, then Thevenin’s equivalent resistance Rth of the circuit will be
A)
3Ω
B)
5Ω
C)
7Ω
D)
10Ω
Option A is correct: 3Ω.
Departmental (other) • 2024 • Engineering Paper-II
In a capacitor the electric charge is stored in
A)
dielectric
B)
metal plates
C)
both dielectric and metal plates
D)
electric charge is not stored
Option B is correct: metal plates.
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
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
A 3-phase load is balanced if all three phases have the same
A)
impedance
B)
power factor
C)
impedance and power factor
D)
none of the above
Option C is correct: impedance and power factor.
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
The phase sequence of a 3-phase balanced system is RYB. The other possible phase sequence can be
A)
BRY
B)
YRB
C)
RBY
D)
BRB
Option A is correct: BRY.
Departmental (other) • 2024 • Engineering Paper-II
A low power factor of the circuit means that it will
A)
draw more active power
B)
draw less line current
C)
draw more reactive power
D)
cause less voltage drop in the line
Option C is correct: draw more reactive power.
Departmental (other) • 2024 • Engineering Paper-II
The most widely used rectifier circuit is
A)
half-wave rectifier
B)
centre-tap circuit
C)
bridge circuit
D)
full-wave rectifier
Option C is correct: bridge circuit.
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)
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)
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.
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)
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)
The speed at which a 6-pole alternator should be driven to generate 50 cycles per second is-
A)
1500 rpm
B)
1000 rpm
C)
800 rpm
D)
500 rpm
Option A is correct: 1500 rpm.
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)
The time period of a direct current is-
A)
infinite
B)
zero
C)
finite
D)
random
Option A is correct: infinite.
Departmental (other) • 2024 • Engineering Paper-II (Electricals/Electronics/Electrical & Electronics/Electronics & Communication/ Electronics & Telecommunication Engineers Under Electrical Wing)
Domestic appliances in household internal wiring are connected in parallel across a.c mains because-
A)
it is a simple arrangement
B)
operation of each appliance becomes independent of the other
C)
appliances have same current ratings
D)
this arrangement occupies less space
Option B is correct: operation of each appliance becomes independent of the other.
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)
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 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)
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)
In Ohim’s law if the resistance or impedance is uniform then-
A)
voltage is equal to current
B)
voltage is directly proportional to current
C)
voltage is inversely proportional to current
D)
voltage is directly proportional to square of current
Option B is correct: voltage is directly proportional to current.
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.
