030/2016

Maximum : 100 marks

Time : 1 hour and 15 minutes

1. Three resistances each having a value of a Ohm are connected to form a Y structure. If a
3 phase balanced supply with a line voltage of A volts is applied, then the power drawn per
phase from the supply is :

(&) 4*/3व @) 84/௦ )
0 4/൦ (D) None of the above

2. A 230V, 50Hz, 1§ supply is connected to the series combination ‏د له‎ pure resistance of 500 a
pure variable capacitor ‏له‎ 2827" ബദ്‌ 8 pure variable inductor of 1.5mH. By properly

adjusting the component values, it is made that the current through the circuit is maximum.
What is the power factor of the cireuit now?

(ക 6 ‏بت‎ 0.5
() Zero o 1

3. In 3§ power measurement using 2 Wattmeter method, both the Wattmeters are reading
positive and equal. This is because :
(வி The load is purely resistive ` @) The load power factor is 0.5
(¢) The phase sequence is RBY (D} The load is purely capacitive
4, A dc source of EMF E Volts and internal Resistance, R Ohms is connected to a variable load

and it is adjusted such that the load abstracts maximum power from the source. The current
drawn from the source is :

(^) 4E/R ∎ 0 7
© E/R (D) E/2R
5. The minimum number of NAND gates required to implement a NOR gate is :
ಯ) 1 (8) 2
© 38 (D) none of the above
6. IfAandBare | variables, the boalean expression A+ AB is:
കു 9 0) B
01 o A
7. Which one among Aluminum, Constantantan Mercury, Carbon have highest resistivity :
(4) Aluminum (B) Constantantan
(0 Mercury (D) Carbon
8. कणाः a two terminal device, resistance decreases when the temperature increases, the
device is : ५
(ಹಿ) ஊகம்‌ ம of a metal (ए) a semiconductor
(C) a dielectric (D) none of the above
A 3

[12.0