Organisation : Council For The Indian School Certificate Examinations
Class : Class XII
Document Type : Specimen Question Paper
Subject : Electricity & Electronics
Semester : 1 And 2
Year : 2022
Website : https://cisce.org/publications.aspx
ICSE Class XII Electricity & Electronics Question Paper
Council For The Indian School Certificate Examinations (ICSE) Class XII Electricity & Electronics Specimen Question Papers Semester 1 and 2 for the year 2022.
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ICSE Class XII Electricity & Electronics Questions
Question 1
With reference to generator, in lap winding, the number of brushes is always
(a) Double the number of poles.
(b) Same as the number of poles.
(c) Half the number of poles.
(d) Two.
Question 2
For starting a D.C. motor a ‘starter resistor’ is required because
(a) It limits the speed of the motor.
(b) It limits the starting current to a safe value.
(c) It starts the motor.
(d) It limits the torque on the motor.
Question 3
In a ‘capacitor start’ motor, the phase displacement between starting and running windings can be nearly
(a) 10°
(b) 30°
(c) 60°
(d) 90°
Question 4
Through which of the following systems can electric power be distributed?
(a) Overhead system.
(b) Underground system.
(c) Both (a) and (b).
(d) None of the above.
Question 5
Which of the following materials is not used for distribution of electrical power?
(a) Copper
(b) Aluminium
(c) Steel
(d) Tungsten
Question 6
A semiconductor diode has
(a) One p-n junction.
(b) Two p-n junctions.
(c) Three p-n junctions.
(d) Four p-n junctions.
Question 7
If the arrow of crystal diode symbol is positive with reference to bar, then diode is ___________ biased.
(a) Forward
(b) Reverse
(c) Either forward or reverse
(d) None of the above
Question 8
When the crystal diode current is large, the bias is
(a) Forward
(b) Inverse
(c) Poor
(d) Reverse
Question 9
If the temperature of a crystal diode increases, then leakage current
(a) Remains the same
(b) Decreases
(c) Increases
(d) Becomes zero
Question 10
Semiconductor diode is used as
(a) Oscillator
(b) Amplifier
(c) Rectifier
(d) Modulator
Question 11
For controlling the initial inrush of current
(a) Reduced voltage is applied to the stator during the starting period.
(b) Reduced voltage is applied to the stator when the motor is running at rated speed.
(c) Either (a) or (b).
(d) The number of turns in the stator coil are increased.
Question 12
A crystal diode has forward resistance of the order of ___________.
(a) kΩ
(b) Ω
(c) MΩ
(d) GΩ
Question 13
If the p type of the crystal diode is connected to the positive terminal of the battery, then this diode is
(a) Forward biased
(b) Reverse biased
(c) Both (a) and (b)
(d) Unbiased
Question 14
The reverse current in a diode is of the order of ___________.
(a) kA
(b) mA
(c) μA
(d) A
Question 15
The forward voltage drop across a silicon diode is about
(a) 2.5 V
(b) 3 V
(c) 10 V
(d) 0.7 V