26.

27

28,

29,

30,

31,

32,

33,

Input to a Half Wave Rectifier circuit is a 50 Hz sine wave. What will be the frequency of its
output waveform ?

(മ) 0Hz ൫ 2511 ര 80118 (D) 100 Hz

Which of the following transistor amplifier configuration is best suited for impedance
matching ?

‎೮೫ ൫ ഠേ ட (D) CD‏ ۵ہ

‎Gain ‘A’ of an amplifier circuit without feedback is found to be 50. To make it an oscillator
circuit the value of the positive feedback gain required is

‎@ 1 ൫ 0.2 © 2 യു 0.01

‎Material used for making brushes in a dc machine 15
(5) Aluminium (8) Carbon (ಲ) 28೦ (D) Chromium

‎Direction of rotation of a dc motor can be reversed by changing the direction of
(ಹಿ) Armature current only

‎(8) Field current only

‎(C) Either Armature current or Field current only

‎(D) Both Armature current and Field current

‎A long shunt 60 compound generator has armature, shunt and series field windings with
0.01 0, 100 Q, 0.02 Q respectively. Find the armature current when it is supplying a load of
50 A at 200 V.

‎(ಹ) 48 A ൫ 494 © 51 + (D) 52 ^

‎A 4 pole 255 V lap connected dc shunt motor with 500 conductors takes an armature current
of 50 A at a magnetic field of 10 milli Weber. If the armature resistance 15 0.02 ೧, and total
brush drop is 2 V, calculate the speed of the motor in rpm.

‎(ಹ) 1500 © 0 €) 3000 (D) 3120

‎In a metering instrument, hair spring used for providing controlling torque is made of

‎(മ) Copper (8) Carbon (~) Aluminium (D) Phosphor Bronze

‎029/2018 6 A