AE 2019 || Day 37 || Combined Syllabus Quiz 1 for ESE & GATE EE Exams

Question 1

The purpose of connecting a Zener diode in a UJT circuit, used for triggering thyristors, is to

Question 2

In a 30:1 Multiplexer, how many select lines are required?

Question 3

If an input sequence x(t)=p(t) of an LTI system having an impulse response is z(t) = a^tp(t), |n|<1, then find the output signal q(t) of the system.

Question 4

What will be the number of 2:1 multiplexers required to realize 4:1 multiplexer?

Question 5

The components of full-wave voltage doubler circuit are

Question 6

For the given transfer function

The response y(t) for a step input r(t) = 5u(t) will be Where u(t) is a unit step input.

Question 7

If the characteristic equation of a feedback control system is given by.
s⁴ + 20s³ + 15s² + 2s + K = 0
then the range of values of K for the system to be stable will be

Question 8

In some substances when an electric field is applied the substance becomes polarized. The electrons and nuclei assume new geometrical positions and the mechanical dimensions are altered. This phenomenon is called:

Question 9

The maximum energy of electrons liberated photoelectrically is:

Question 10

A Wheatstone bridge requires a change of 7 Ω in the unknown resistance arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The sensitivity and the deflection factor will be nearly

Question 11

The galvanometer used in a Wheatstone bridge as a detector can detect a current as low as 0.1 nA and its resistance is negligible compared to internal resistance of the bridge. Each arm of the bridge has a resistance of 1 kΩ. The input voltage applied to the bridge is 20 V. The smallest change in the resistance that can be detected is

Question 12

The inductance of a 25 A electrodynamic ammeter changes uniformly at the rate of 0.0035 μH/degree. The spring constant is 10^-6 N m/degree. The angle of deflection at full scale will be

Question 13

An inductor of 0.5H inductance and 90 Ω resistance is connected in parallel with a 20 μF capacitor. A voltage of 230 V at 50 Hz is maintained across me circuit. The total power taken from the source is nearly

Question 14

A 240 V shunt motor with the armature resistance of 0.1 Ω runs at 850 r p.m. for an armature current of 70 A. If its speed is to be reduced to 650 r.p.m. the resistance to be placed in series for an armature current of 50 A is nearly

Question 15

A 200 V d.c. shunt motor with armature resistance of 0.2 Ω and carrying a current of 50 A is running at 960 r.p.m. If the flux is reduced by 10% at constant torque and with negligible iron and friction losses, the speed will be nearly When, I₁ = 50 A ⇒ ϕ₁ = Flux per pole, N = 960 rpm and flux is reduced by 10% at constant.
Torque, N = ?

Question 16

In a 440 V, 50 Hz transformer, the total iron loss is 3700 W. When the applied voltage is 220 V at 25 Hz, the total iron loss is 750 W. The eddy current loss at the normal voltage and frequency will be

Question 17

In ABCD parameters, A and C are called

Question 18

What is the condition for reciprocity and symmetry in Y-parameter representation?

Question 19

Which one of the following is not required for power diode?

Question 20

The reverse recovery time of a diode is t_rr = 3 and the rate of fall of the diode current is di/dt = 30 A/μs. The storage charge Q_RR and the peak inverse current I_RR will be respectively