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

Question 1

The speed of a DC motor is _________.

Question 2

The function of a commutator in a DC generator is _________.

Question 3

If the AC supply to transformer is replaced by DC ___________.

Question 4

The construction of synchronous motor is similar to

Question 5

What is the maximum length of the flexible conduit in motor installation?

Question 6

A 5000 kVA, 1100 V, 50 Hz, Y-connected

alternator has armature resistance of

and synchronous reactance/phase of

. Find the generated e.m.f. per phase (power factor is unity).

Question 7

The standing wave ratio of a

transmission line used to feed a

resistive load will be _________.

Question 8

Why is the air gap between the yoke and armature of an electric motor kept smaller?

Question 9

Calculate the value of unknown inductance measured by Hay’s bridge. Circuit elements are –

and supply angular frequency is 100 rad/sec –

Question 10

In a two wattmeter method reading of both wattmeter are 600W and 300W then find power factor if second wattmeter reading is taken after interchanging the connection of current coil –

Question 11

Calculate the value of unknown resistance measured by Hay’s bridge. Circuit elements are –

and supply angular frequency is 100 rad/sec –

Question 12

A strain gauge with nominal resistance of 100 Ω having gauge factor 4, undergoes to a strain of 10^-3 . Find the change in resistance –

Question 13

In the circuit shown below the voltage function is V = 150sinωt. The average power in the resistance ‘R’ will be:

Question 14

Using Millman’s theorem, find the current through the load resistance, if the Load Resistance is of 5Ω ?

Question 15

In a parallel circuit operating with a source of 30 V AC, designed to carry a total current of 6 A, what happens to the protection device (fuse) when the resistance suddenly changes to 2Ω?

Question 16

Four resistances 2 Ω, 4 Ω, 5 Ω, 20 Ω are connected in parallel. Their combined resistance is

Question 17

A d.c. 3-wire system is to be converted into 3-phase, 4-wire system by adding a fourth wire equal in X-section to each outer of the d.c. system. The percentage power loss and voltage at the consumer’s terminals are to be the same. Assume loads to be balanced. What is the percentage loss in 3-phase, 4-wire a.c. system? Assume power factor is unity.

Question 18

A 50 km long transmission line supplies a load of 5 MVA at 0.8 power factor lagging at 33 kV. The efficiency of transmission is 90%. The volume of Al conductor (specific resistance of aluminium

required for single-phase, 2-wire line is

Question 19

A generating station has the following data; Installed capacity = 300 MW; Plant capacity factor = 50%; Annual load factor = 60%; Annual cost of fuel, oil etc. = Rs. 19 x 10⁸; Capital cost = Rs. 10¹⁰; Annual interest and depreciation = 10%. The cost per unit generated is

Question 20

A synchronous motor having a power consumption of 50 kW is connected in parallel with a load of 200 kW having p.f. of 0.8 lag. The excitation of the motor is adjusted until combined p.f. becomes 0.9 lag. What is the leading kVAR supplied by the synchronous motor?