Prepare for the APPSC Inspector of Factories (Electrical) recruitment examination with official previous years' solved question papers across Electrical Circuits & Machinery, Power Generation, Transmission & Distribution, Industrial Substation Design, CEA (Measures Relating to Safety & Electric Supply) Regulations 2010, Indian Electricity Rules 1956, Factories Act 1948 (Electrical Safety Provisions), Earthing Practices (IS 3043), Flameproof Apparatus for Hazardous Explosive Atmospheres (IS/IEC 60079), Protection Relays, and Industrial Fire Safety Systems.
Marking pattern: +1.00 positive, -0.33 (1/3rd) negative marking (Official APPSC Technical CBT Scheme; 150 Questions, 150 Marks).
In a transistor Hartley oscillator:
Which semiconductor device acts like a diode and two resistors:
An SCS has:
For small values of drain-to-source voltage, JFET behaves like a:
FETs have similar properties to:
As compared to power MOSFET a BJT has:
An IGBT has three terminals called:
An MCT has three terminals called:
In the conduction mechanism Schottky diode :
The selection of rectifier diode depends mostly on:
A torque can develop due to interaction between two coil currents, if these are:
The torque produced in a 4-pole machine is 100 Nm. If this machine is rewound with 6-poles, other things remaining unchanged, then the torque produced would be:
A separately excited d.c. generator is running at rated speed and at no-load. If its field is winding is suddenly connected to a d.c. source, then rise in armature generated voltage is governed by:
The function of equalizing connections of a lap wound d.c. generator is:
A d.c. shunt generator is floating on the bus bar. It can be loaded by:
(i) Increasing its driving torque
(ii) Decreasing its driving torque
(iii) Increasing its field current
(iv) Decreasing its field current
From the above the correct answer is:
For successful parallel operation of d.c. generators, equalizer is required for:
Plugging of d.c. motors carried out by:
For continuously running rolling mills with intermittent loading, the most suitable d.c. drive is a:
Neglecting all losses the developed torque (T) of a d.c. separately excited motor operating under constant power (P) is as under:
SCR for a synchronous machine is the reciprocal of:
(i) $X_d$ in $\Omega$
(ii) $X_d$ in p.u
(iii) $X_s$ in $\Omega$
(iv) $X_s$ in p.u
From the above the correct answer is:
The following method is best suited for finding the voltage regulation of an alternator:
A 3-phase, 4 pole, 24 slot alternator has its armature coils short pitched by one slot. The pitch factor becomes:
A synchronous machine with large SCR has:
In a 3-phase synchronous machine, if its air gap length is increased, then for the same excitation voltage, its cost:
During 3-phase short circuit test on an unloaded alternator, the d.c. component may be 0 (zero) in: