MPPGCL JE Electrical Mock Test - 4 - Electrical Engineering (EE) MCQ

The losses in a transformer are:
(a) copper loss
(b) hysteresis loss
(c) eddy current loss
The constant power loss in a transformer is given by ;

The energy stored in the magnetic field of a solenoid 30 cm long and 3 cm diameter with 1,000 turns of wire carrying a current of 10A is-

When the relative permeability of a material is slightly less than 1 , it is called a-

In an RLC circuit, supplied from an ac source, the reactive power is proportional to the-

"In all cased electromagnetic induction, an induced voltage will caused a current to flow in a closed circuit in such a direction that the magnetic field which in caused by the current will opposed the change that produces the current", is the original statement of____.

An industrial consumer has a load pattern of 2000 KW 0.8 lag for 12 hours and 1000 KW unity power factor for 12 hours. The load factor is _____

For thermionic emission

ACSR conductors have_____.

What happens when the centrifugal starting switch fails to close?

The short circuit KVA is maximum when fault occurs

Strain gauge rosettes are used when ____________.

Calculate the total energy stored in magnetic field in a solenoid having inductance 100mH when carrying a current of 30 A –

A circuit has inductance of 2 H. If the circuit current changes at the rate of 10 A/'sec, then self-induced emf is-

The condition of a semiconductor diode can be determined quickly using:

If the terminals of armature of the D.C. motor are interchanged, this action will offer the following kind of braking-

The stator-produced MMF and rotor-produced MMF both rotate in the air gap in-

The equivalent inductance seen at terminal a-b in the figure is-

Electric traction in comparison to other traction systems has the advantages of_____.

In a fluorescent tube, if only the ends of the tube remain lighted, it indicates that-

The instantaneous power of a 1-phase series circuit supplying R-L load from a sinusoidal voltage source has in each cycle.

In indicating instruments, the springs are mainly used to-

Resistance switching is commonly employed in-

Tesla is the unit of-

A voltmeter, when connected across a DC supply, reads 124 V. When a series combination of the voltmeter and an unknown resistance X is connected across the supply, the meter reads 4V. If the resistance of the voltmeter is. the value of X is-

In reference to the figure, the voltage waveform v9t) is measured by a PMMC, a PMMC combined with bridge rectifier and a moving iron (MI) instrument. Two lists are prepared thereafter :

Instrument list List of instrument reading
List - II
a. PMMC
b. PMMC rectifier
c. M.I.
List - II
i. 5 V
ii. 2.75 V
iii. 2.5 V
The correct option relating the instruments and their reading is

It is desired to correct the p.f. to 0.95 by means of static capacitors connected across each phase of a 3-phase, 400 V, 50 Hz motor having a maximum load of 50 kVA at a p.f. of 0.75 lagging. The capacitors are delta connected. What is the capacitance of each capacitor?

A factory takes a steady load of 200 kW at a lagging power factor of 0.8. The tariff is Rs. 100 per kVA of maximum demand per annum plus 5 paise per kWh. The phase advancing plant costs Rs. 500 per kVAR and the annual interest and depreciation together amount to 10%. The most economical p.f. is