Master official APPSC Assistant Executive Engineer previous years' solved question papers with comprehensive step-by-step derivations across Electric Circuits & Network Theory, Electromagnetic Fields, Electrical Machines, Power Systems (Transmission, Distribution & Protection), Control Systems, Electrical & Electronic Measurements, Power Electronics & Drives, and Analog & Digital Electronics.
Marking pattern: +1.00 positive, -0.33 negative marking (Official APPSC 1/3rd Negative Marking Scheme; 150 Questions, 150 Marks).
The essential condition for parallel operation of two dc generators is they have the same
A dc motor delivering constant power output initially operates at $1500\text{ rpm}$ with torque delivered as $200\text{ Nm}$. The torque delivered at $1200\text{ rpm}$ is
The $T_d$ vs $I_a$ characteristic of a dc series motor is a
The Laplace inverse of $\frac{s}{s + 2}$ is given by
If current flowing in a lamp drops by $1\text{ percent}$, the power will be decreased by
The most suitable material for transformer core is
In cascade operation of two induction motors, the ratio of mechanical power developed and electrical power in the rotor of the main induction motor having $P_{1}$ number of stator poles will be
The thickness of stator laminations is of the order of
In large capacity transformers, 5% of the turns at the end of hv winding are provided with extra insulation so as to provide protection
The current flowing in an inductive circuit consisting of a resistance and an inductance is expressed by $i = I_{m} \sin \omega t$. The expression for the applied voltage will be
Varley loop tests are preferred over Murray loop tests because
For applications requiring speed ratio other than $2 : 1$, the speed control of an induction motor can be effected by varying the number of stator poles employing
In 3-phase induction motors, speeds higher than synchronous speed can be had by
The method of speed control used for increasing the speed of a dc shunt motor above its rated speed is
If N is the speed, then the windage loss in dc motor is proportional to
If $R_{t2}$ and $X_{t2}$ are the total resistance and reactance of the transformer referred to secondary, $I_2$ is the secondary load current and $\cos\phi_2$ is the leading pf, then equation for rise in voltage when load is thrown off is
A delta-delta bank consisting of three $20\text{ kVA}$ transformers supplies a load of $40\text{ kVA}$. If one of the transformers is damaged and removed, the load that can be safely carried by the open-delta bank is
In a Scott connected transformer, the number of turns in the main and teaser transformer respectively are
The purpose of interpoles in dc machines is to nullify
The starting torque of an induction motor varies as
A starter is necessary to start a dc motor because it is needed to
In a CRO, the quantity to be measured is applied across
The resistance of a wire is $2\ \Omega$. If the diameter of the wire is reduced to half, keeping the same length, the resistance will be
In electric discharge lamps, light is produced by
Which of the following bulbs operates on least power?