#2
| |||
| |||
Re: HPCL Previous Year Question Papers For Electronics
Ok, here I am providing you the previous year question paper of Electronics of Hindustan Petroleum Corporation Limited HPCL. HPCL Electronics Question Paper 1. Removing bypass capacitor across the emitter-leg resistor in a CE amplifier causes (A) increase in current gain. (B) decrease in current gain. (C) increase in voltage gain. (D)decrease in voltage gain. Ans: D 2. When a step-input is given to an op-amp integrator, the output will be (A) a ramp. (B) a sinusoidal wave. (C) a rectangular wave. (D) a triangular wave with dc bias. Ans: A 3. Hysteresis is desirable in Schmitt-trigger, because (A) energy is to be stored/discharged in parasitic capacitances. (B) effects of temperature would be compensated. (C) devices in the circuit should be allowed time for saturation and desaturation. (D) it would prevent noise from causing false triggering. Ans: C 4. Space charge region around a p-n junction (A) does not contain mobile carriers (B) contains both free electrons and holes (C) contains one type of mobile carriers depending on the level of doping of the p or n regions (D) contains electrons only as free carriers Ans: A 5. When an amplifier is provided with current series feedback, its (A) input impedance increases and output impedance decreases (B) input and output impedances both decrease (C) input impedance decreases and output impedance increases (D) input and output impedances both increase Ans: D 6. The fan-out of a MOS-logic gate is higher than that of TTL gates because of its (A) low input impedance (B) high output impedance (C) low output impedance (D) high input impedance Ans: D 7. A highly stable resonance characteristic is the property of a ____ oscillator. (A) Hartley (B) Colpitts (C) Crystal (D) Weinbridge Ans. (C) 8. A phase shift oscillator uses __________________. (A) LC tuning (B) Piezoelectric crystal (C) Balanced bridge (D) Variable frequency operation Ans. (C) 9. A bistable multivibrator is a (A) Free running oscillator. (B) Triggered oscillator. (C) Saw tooth wave generator. (D) Crystal oscillator Ans:B 10. The number of point to point links required in a fully connected network for 50 entities is (A) 1250 (B) 1225 (C) 2500 (D) 50 Ans: (C) 11. The ________is a circuit-switched network, while the ______is a packet-switched network. (A) Telephone, ATM (B) SONET and FDDI (C) Satellite, Telephone (D) FDDI and SONET Ans: (A) 12. Direct inward dialling is used as a feature in (A) PSTN. (B) PBX. (C) EPABX. (D) VPN. Ans: (C) 13. ISDN handles data pertaining to (A) All digital services (B) Speech and Video (C) Computer data only (D) Speech only Ans: (A) 14. A BJT operates as a switch (A)under small signal conditions (B)with no signal condition (C)in the active region of transfer characteristic (D)under large signal conditions Ans 15. Bulk power transmission over long HVDC lines are preferred, on account of (A)low cost of HVDC terminals (B)no harmonic problems (C)minimum line power losses (D)simple protection Ans:C 16. A converter which can operate in both 3-pulse and 6-pulse modes is (A)1-phase full converter (B)3-phase half wave converter (C)3-phase semiconverter (D)3-phase full converter Ans:C 17. A three-phase semiconverter feeds the armature of a separately excited dcmotor, supplying a nonzero torque. For steady-state operation, the motor armature current is found to drop to zero at certain instances of time. At suchinstances, a voltage assumes a value that is (A)equal to the instantaneous value of the ac phase voltage (B)equal to the instantaneous value of the motor back emf (C)arbitrary (D)zero Ans:B 18. The frequency of the ripple in the output voltage of a 3-phase semiconverter depends upon (A)firing angle and load resistance (B)firing angle and supply frequency (C)firing angle and load inductance (D)only on load circuit parameters Ans:B 19. In dielectric heating, the rate of heating cannot be increased by increasing the potential gradient because (A)Coupling problems become highly pronounced (B)Very high voltages are not easily available (C)Heating becomes non-uniform (D)Corona takes place Ans 20. The speed and torque of induction motors can be varied by which of thefollowing means? (A)Stator voltage control (B)Rotor voltage control (C)Frequency control (D)All of these Ans |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Previous Year Question Papers CUSAT | Unregistered | Main Forum | 2 | 2nd April 2018 08:25 AM |
Electronics Corporation of India Limited Previous Question Papers | Unregistered | Main Forum | 2 | 23rd March 2018 05:32 PM |
Previous year MBA question papers | Saksham | Main Forum | 1 | 13th October 2017 02:21 PM |
BVP CET Previous Year Question Papers | Unregistered | Main Forum | 1 | 10th November 2016 11:46 AM |
HPCL Previous Question Papers For EEE | Unregistered | Main Forum | 1 | 9th November 2016 06:02 PM |
HAL MT Previous Year Question Papers For ECE | Unregistered | Main Forum | 1 | 2nd November 2016 04:15 PM |
HPCL Previous Question Papers For ECE | Unregistered | Main Forum | 1 | 15th October 2016 12:00 PM |
Previous Question Papers Of MBA 1st Year 1st Sem | harshinis. | Main Forum | 9 | 10th January 2016 07:51 PM |
Indian Engineering Service Electronics and Telecom Engineering previous year question | Unregistered | Main Forum | 1 | 6th November 2015 04:48 PM |
BARC Previous Question Papers For Electronics BARC Previous Papers | Unregistered | Main Forum | 0 | 9th July 2015 09:50 AM |
RTU Previous Year Question Papers | Unregistered | Main Forum | 0 | 8th July 2015 04:16 PM |
Hindustan Petroleum Corporation Limited Electronics previous year question papers | Unregistered | Main Forum | 1 | 20th October 2014 11:02 AM |
HPCL Electrical Engineering Previous Year Papers | Unregistered | Main Forum | 1 | 13th October 2014 04:38 PM |
Gujarat State Electricity Corporation Limited Electronics previous year question pape | Unregistered | Main Forum | 1 | 12th October 2014 11:44 AM |
Gujarat Energy Transmission Corporation Limited Electronics previous year question pa | Unregistered | Main Forum | 1 | 12th October 2014 11:31 AM |
Uttar Gujarat Vij Company Ltd Electronics previous year question papers | Unregistered | Main Forum | 1 | 12th October 2014 11:31 AM |
VTU Previous Year Question Papers for 5th SEM | manya | Main Forum | 1 | 22nd January 2013 05:05 PM |
ISRO Previous Year Question Papers for Electronics | kndnrajh | Main Forum | 1 | 2nd November 2012 11:32 AM |
DU question papers previous year | nayeem kha | Main Forum | 1 | 16th August 2012 12:42 PM |
VTU Previous Year Question Papers 7th SEM CSE | pankaj chandel | Main Forum | 0 | 30th June 2012 05:16 PM |
|