AP ECET Electronics & Instrumentation Engineering Paper 2019
| Sr. No. | Question |
| 1 | Two resistors R1 and R2 give combined resistance of 4.5 Ohm when in series and 1 Ohm when in parallel, the resistances are
(a) 2 Ohm & 2.5 Ohm (b) 1 Ohm and 3.5 Ohm (c) 1.5 Ohm and 3 Ohm (d) 4 Ohm and 0.5 Ohm Ans – (c) |
| 2 | Three resistances each of R Ohm are connected to form a triangle. The resistance between any two terminals will be _________
(a) R Ohm (b) 3R/2 Ohm (c) 3R Ohm (d) 2R/3 Ohm Ans – (d) |
| 3 | The principle of dynamically induced emf is utilized in _______
(a) Transformer (b) Choke (c) Generator (d) Thermocouple Ans – (c) |
| 4 | The direction of rotation of a DC motor can be determined by _________
(a) Fleming’s right hand rule (b) Fleming’s left hand rule (c) Lenz’s law (d) Ampere law Ans – (b) |
| 5 | The basic function of a transformer is to change _______
(a) The level of the voltage (b) The power level (c) The power factor (d) The frequency Ans – (a) |
| 6 | A Solar cell is actually a device which utilizes _______
(a) Photoconductive effect (b) Photovoltaic effect (c) Photo emissive effect (d) Photo resistive effect Ans – (b) |
| 7 | Opto-coupler is used to __________
(a) Reduce SCR turn-off time (b) Protect IGBTs against dv/dt (c) Regulate gate signal (d) Isolate gating circuitry from power lines Ans –(d) |
| 8 | Induction heating takes place in __________
(a) Insulating material (b) Conducting and magnetic materials only (c) Conducting and non-magnetic materials only (d) Conducting materials which may be magnetic or non-magnetic Ans – (d) |
| 9 | In dielectric heating current flows through ________
(a) Air (b) Dielectric (c) Metallic conductor (d) Ionic discharge between dielectric medium and metallic conductor Ans – (b) |
| 10 | The main drawback of resistance welding is _________
(a) High initial as well as maintenance cost (b) Difficult shapes and sections cannot be welded (c) Only similar metals can be welded (d) Parent metal is affected Ans – (a) |
| 11 | Which one of the following effects in the system is NOT caused by negative feedback?
(a) Reduction in gain (b) Increase in bandwidth (c) Increase in distortion (d) Reduction in output impedance Ans – (c) |
| 12 | A device having characteristics very close to that of an ideal voltage source is ________
(a) Vacuum diode (b) Zener diode (c) Transistor (d) FET Ans –(b) |
| 13 | In a P-N junction, the barrier potential offers opposition to only _______
(a) Holes in P- region (b) Free electrons in N-region (c) Majority carriers in both regions (d) Minority carriers in both regions Ans – (c) |
| 14 | For constructing a full wave rectifier _____—diodes are needed
(a) At least two (b) More than two (c) At least four (d) More than four Ans – (a) |
| 15 | For an NPN bipolar transistor, what is than main stream of current in the base region ?
(a) Drift of holes (b) Diffusion of holes (c) Drift of electrons (d) Diffusion of electrons Ans – (d) |
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