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).
A synchronous motor can be used as synchronous condenser when it is
If $Z_d$, $X_d$ and $X_q$ are per-phase values of direct axis synchronous impedance, direct axis synchronous reactance and quadrature axis synchronous reactance respectively, then for a non salient-pole synchronous machine
In the given circuit, the current is $i(t) = 4 \sin(500t)\text{ A}$. The applied voltage in volts is
Operating torques in an indicating instrument are
In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided
In a 3-phase synchronous motor, the magnitude of field flux
A 3-phase synchronous motor needs dc supply for excitation
A synchronous motor operating with normal excitation adjusts to increased load due to increase in
A 5 kVA transformer has a turn-ratio of $(N_{1}/N_{2}) = 10$. The impedance of the primary winding is $3 + j5\text{ ohms}$ while that of secondary winding is $0\cdot5 + j0\cdot8\text{ ohms}$. The impedance of the transformer when referred to the primary will be
In indicating instruments, the springs are mainly used to
In the circuit of fig. shown, steady state has been reached with the switch open. The switch is closed at $t = 0$. The current $i$ at $t = 0^{+}$ is
The function of a starter in a dc motor is
During normal running conditions, the armature current drawn by a dc shunt motor is given by
In a dc machine, the laminated parts are armature and
The direction of shaded pole single phase induction motor can be reversed by
Inverted V-curve of a synchronous motor is
A 220 V dc machine has an armature resistance of $1\;\Omega$. If the full-load current is 20 A, the difference in the induced voltage when the machine runs as a motor, and as a generator, is
A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal input is 1000 Hz. What is the frequency of the vertical input?
The speed of single phase induction motors can be controlled by
Maximum operating frequency of CRO is mainly governed by its
If $V_{th} = 10\text{ V}$, $R_{th} = 2\;\Omega$ and $R_{L} = 3\;\Omega$, then current through $R_{L}$ is
In dc machines, the space distribution of air gap flux density wave at no-load is
The flux created by current flowing through the primary winding of a transformer induces emf in
In the given circuit, the current flowing in the $2\;\Omega$ resistor is
The steady state value of the current in the given circuit is