1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A transformer has 400 turns in its primary winding and 800 turns in its secondary winding. The primary voltage is $$20 \mathrm{~V}$$ and the load in the secondary is 4 ohm. The current in the primary, assuming it to be an ideal transformer, is

A
40 A
B
20 A
C
4 A
D
2 A
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A group of devices having a total power rating of 500 watt is supplied by an $$\mathrm{AC}$$ voltage $$E=200 \sin \left(3.14 t+\frac{\pi}{4}\right)$$. Then the r.m.s. value of the circuit current is

A
500 A
B
1 A
C
200 A
D
5 A
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An AC voltage source of variable angular frequency $$\omega$$ and fixed amplitude $$\mathrm{V}_0$$ is connected in series with a capacitance $$\mathrm{C}$$ and an electric bulb of resistance $$\mathrm{R}$$ (inductance zero). When $$\omega$$ is decreased

A
the bulb switches off
B
total impedance of the circuit is unchanged
C
the bulb glows brighter
D
the bulb glows dimmer
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A transformer which steps down $$330 \mathrm{~V}$$ to $$33 \mathrm{~V}$$ is to operate a device having impedance $$110 \Omega$$. The current drawn by the primary coil of the transformer is :

A
0.3 A
B
0.03 A
C
3 A
D
1.5 A
COMEDK Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12