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Which of the following devices convert fixed DC to variable DC ?
(ಹಿ) cyclo converter (B) phase controlled rectifier
(C) chopper (D) voltage source inverter

If V. is the peak value of carrier signal and V_ is that of reference signal, modulation index of
a sinusoidal PWM is :

(^) ۷۰/۷۰ © ۷/۷ (©) (४५८५) യു (५८४०२

Which of the following possess bidirectional current capability ?
(^) भरा (B) ‏عمل‎ (€) 7 (D) SCR

What is the approximate value of an alternating current producing 4 times the heat produced
per second by a steady current of 2 A in a resistor ?

(A) 26A (B) 56A 8۸ D) 4A

A current of 2.2 A flows through a coil when connected to 220 V DC. When 220 ४ 50 Hz
AC is applied to the same coil, current is 1 A. What is inductance of coil ?

(ಗಿ) 62411 (8) 624 ‏تلم‎ (C) 0624 H (D) 0624 mH

A 50 Hz AC current of peak value 1 A flows through the primary coil of a transformer. If the
mutual inductance between primary and secondary is 1.5 पा, फिर mean value of induced
voltage is :

(A) 300V (B) 225V (೧) 150 ५ (0) 75%

The r.m.s. value ೧1 the e.m.f. given by E=8 sinwt + 6 sin2wt volt is :
(^) 22 ५ 9, 52४ © ۷ (0) 10%

A 22 cm long solenoid having total number of turns 1000, consists of a core of cross sectional
area 4 cm?. Half portion of the core consists of air and other half is made of iron of relative
permeability 500. The self inductance of the solenoid is :

(A) 064 mH (B) 0.057 H (9) 85713 (D) 570H
Which of the following is a solution to Ferranti effect 7
(A) shunt capacitor (8) shunt reactor

(C) series capacitor (D) none of the above

FACTS device is used for :

(ಗಿ) enhancing controllability (8) varying network impedance
(C) increasing power transfer (D) all of the above
7 117/2014

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