ENGINEERING CAREER AND STUDY MATERIALS

GATE Electrical Engineering Question & Answer Key The GATE Electrical Engineering Exam Questions with answers published for the use of candidates who are appearing upcoming Examinations   Question No. 1. The d.c. series motor should always be started with load because (A) at no load, it will rotate at dangerously high speed. (B) it will fail to start. (C) it will not develop high starting torque. (D) all are true.  Ans: A Question No. 2. The armature of a dc machine is laminated to reduce: (A) Eddy current loss (B) Hysteresis loss (C) copper losses (D) friction and windage losses  Ans: A Question No. 3. The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor at full load speed is about (A) 50 Hz. (B) 20 Hz. (C) 2 Hz. (D) Zero.  Ans: C Question No. 4. If a single phase alternator has 8 slots per pole uniformly speed, but the winding is arranged with the middle two left empty, the breadth coefficient will be (A) 0.53....

Q.#1. The resistance of armature winding depends on (a) length of conductor (b) cross-sectional area of the conductor (c) number of conductors (d) all of the above Ans: (d) all of the above Q.#2. A commutator in a d.c. machine  (A) Converts the induced a.c armature voltage into direct voltage.  (B) Reduces power loss in field circuit.  (C) Reduces power loss in armature.  (D) Is not necessary. Ans:  (A) Converts the induced a.c armature voltage into direct voltage. Q.#3. In D.C. generators, the cause of rapid brush wear may be (a) severe sparking (b) any of the above (c) imperfect contact (d) rough commutator surface Ans: (b) any of the above Q.#4. The introduction of interpoles in between the main pole improves the performance of d.c. machines, because (A) A counter e.m.f. is induced in the coil undergoing commutation. (B) The flux waveform is improved with reduction in harmonics. (C) The inequality of...

Mechanical Engineering Multiple Choice Questions Q1. The buckling load for a column pinned at both ends is 10 kN. If the ends are fixed, the buckling load changes to (1) 40 kN (2) 2·5 kN (3) 5 kN (4) 20 kN Q2. A 30 mm hole/shaft assembly results in minimum and maximum clearance of 0·03 mm and 0·3 mm respectively. The hole has a unilateral tolerance with zero fundamental deviation. If the tolerance of the shaft is 0·08 mm, the maximum size of the hole is (1) 30·11 mm (2) 30·16 mm (3) 30·19 mm (4) 30·27 mm Q3. Consider the following drives : A. V-belt B. Flat belt C. Toothed belt D. Round belt Which of the above is/are positive drive(s) ? Select the code for the correct answer from the options given below : (1) A and B only (2) B only (3) C only (4) C and D only Mechanical Engineering Solved Question Paper-100 Questions- Click here Q4. Bolts in the flanged end of a pressure vessel are usually pre-tensioned. Indicate which of the following statements is not...

1. D.C. generator generally preferred for charging automobile batteries is (a) series generator (b) shunt generator (c) long shunt compound generator (d) any of'the above Ans: c 2. No-load current in a transformer (a) lags behind the voltage by about 75° (b) leads the voltage by about 75° (c) lags behind the voltage by about 15° (d) leads the voltage by about 15° Ans: a 3. Primary winding of a transformer (a) is always a low voltage winding (b) is always a high voltage winding (c) could either be a low voltage or high voltage winding (d) none of the above Ans: c 4. Power transformers are designed to have maximum efficiency at (a) nearly full load (b) 70% full load (c) 50% full load (d) no load Ans: a 5. In a transformer the tappings are generally provided on (a) primary side (b) secondary side (c) low voltage side (d) high voltage side Ans: c 6. Transmission voltage of llkV is normally used for distances upto (a) 20—25 km (b) 40—50 km (c)...

Question No. 1. Electric resistance seam welding uses __________ electrodes.  (A) Pointed (B) Disc.  (C) Flat (D) Domed Ans: B Question No. 2. Spring constant in force-voltage analogy is analogous to (a) capacitance (b) reciprocal of capacitance (c) current (d) resistance Ans: b Question No. 3. The frequency and time domain are related through which of the following? (a) Laplace Transform and Fourier Integral (b) Laplace Transform (c) Fourier Integral (d) Either (b) or (c) Ans: a Question No. 4. When the initial conditions of a system are specified to be zero it implies that the system is (a) at rest without any energy stored in it (b) working normally with reference input (c) working normally with zero reference input (d) at rest but stores energy Ans: d Question No. 5. The power of a n-phase circuit can be measured by using a minimum of (a) (n - 1) wattmeter elements (b) n wattmeter elements (c) (n + 1) wattmeter elements (d) 2n wattme...

MECHANICAL ENGINEERING EXAM QUESTIONS Question # 1. If the mechanical properties of a composite improves as a result of increasing the average fibre length, then it is called (1) Long fibre (2) Short fibre (3) Medium length fibre (4) Elastic fibre Question # 2. A refrigerator working on a reversed Carnot cycle removes 2 kW per minute of heat from a system working between the temperatures of 300 K and 200 K. The COP and power consumed by the cycle will be (1) 1, 1 kW (2) 1, 2 kW (3) 2, 1 kW (4) 2, 2 kW Question # 3. 18-4-1 HSS steel contains (1) 18% tin, 4% nickel, 1% chromium (2) 18% tungsten, 4% nickel, 2% chromium (3) 18% tungsten, 4% chromium, 1% vanadium (4) 18% nickel, 4% chromium, 1% manganese Question # 4. The dryness fraction of sample steam in separating calorimeter is 0·9 and in throttling calorimeter is 0·8. The dryness fraction of the sample is (1) 0·9 (2) 0·8 (3) 0·66 (4) 0·72 Mechanical Engineering Solved Question Paper-100 Questions- Clic...

Question No. 1:-The 8-bit encoding format used to store data in a computer is  A:-ASCII  B:-EBCDIC  C:-ANCI  D:-USCII  Correct Answer:- Option-B Question No. 2:-The resistance of an ideal voltmeter is _________  A:-Zero  B:-Low  C:-High  D:-Infinite  Correct Answer:- Option-D Question No. 3:-The tenacity or hardness with which the bond holds the cutting point or abrasives in place of a grinding wheel is defined by the term ?  A:-Structure  B:-Grit size  C:-Grain size  D:-Grade  Correct Answer:- Option-D Question No. 4:-Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than  A:-5 mm  B:-10 mm  C:-20 mm  D:-30 mm  Correct Answer:- Option-D Question No. 5:-Which of the following fine dust removal equipment is the most efficient ?  A:-bag filter  B:-scrubber  C:-electrostatic precipitator ...

Junior Engineer (Electrical) - AIIMS Jodhpur Model Question Answer Electrical Engineers Recruitment Examination conducted by AIIMS Jodhppur, the previous question papers published in our websites and the model questions answers are listed below Q. No. 1. Various adjustments in an energy meter include (a) light load or friction (b) lag and creep (c) overload and voltage compensation (d) temperature compensation (e) all of the above Answer: (e) all of the above Q. No. 2. The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C) Answer: (B) offers high impedance to carrier frequency signal Junior Engineer (Electrical) - AIIMS Jodhpur Model Question Answer   Q. No. 3.Most sensitive galvanometer is (a) elastic galvanometer (b) spot ballistic galvanometer (c) Duddlb galvanometer...

Question No.1. A d.c. shunt motor runs at no load speed of 1140 r.p.m. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full load speed in r.p.m. is (A) 1200 (B) 1203 (C) 1000 (D) 1080 Answer: (D) 1080 Question No.2 The voltage at the two ends of a transmission line are 132 KV and its reactance is 40 ohm. The Capacity of the line is (A) 251.5 MW (B) 217.8 MW (C) 435.6 MW (D) 500 MW Answer: (C) 435.6 MW Question No.3. The gravity controlled instrument has crowded scale because current is proportional to (A) balancing weight (B) deflection angle (C) sine of deflection angle (D) Location of CT Ans: (C) sine of deflection angle Question No.4. For LV applications (below 1 kV), ______________ cables are used. (A) Paper insulated. (B) Single core cables. (C)Plastic. (D) Oil filled. Answer: B) Single core cables. Question No.5. The eddy current loss in an a-c electric motor...

Electrical Engineering Questions with Answer 2017 Question # 1. The drive motor used in a mixer-grinder is a (A) universal motor. (B) induction motor. (C) synchronous motor. (D) dc motor. Ans: (A) universal motor. Question # 2. The direction of rotation of hysteresis motor is reversed by  (A) Reversing supply lead  (B) Shift shaded pole with respect to main pole  (C) Either A or B  (D) Neither A nor B Ans: (B) Shift shaded pole with respect to main pole Question # 3. Alternating current is measured by (A) induction ammeter (B) permanent magnet type ammeter (C) electrostatic ammeter (D) moving iron repulsion type voltmeter Ans: (A) induction ammeter Question # 4. A 3-phase, 400 votts, 50 Hz, 100 KW, 4 pole squirrel cage induction motor with a rated slip of 2% will have a rotor speed of (A) 1500 rpm (B) 1570 rpm (C) 1530 rpm (D) 1470 rpm Ans: (D) 1470 rpm Question # 5. The torque, in a _____________is prop...

1. Which of the following is not a vector ? (a) Linear momentum (b) Electric potential (c) Electric field (d) Angular momentum Answer: (d) Angular momentum 2. The efficiency of a machine should be as ______ as possible to reduce the operating cost. (a) high (b) low (c) either of the above (d) none of the above Answer:(a) high 3. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be (a) 60 N (b) 40 N

Question# 1. A sensitive galvanometer produces large deflection for a (a) large value of power (b) large value of current (c) small value of current (d) large value of voitage (e) none of the above Answer: (c) small value of current Question# 2. Mass, in force-voltage analogy, is analogous to (a) charge (b) current (c) resistance (d) inductance Answer: (d) inductance Question# 3. To measure radio frequency, the suitable frequency meter is (a) hetrodyne frequency meter (b) reed vibrator frequency meter (c) Weston frequency meter (d) electrical resonance frequency meter Answer: (a) hetrodyne frequency meter Question# 4. Which of the following can be measured by the use of a tacho-generator ? (a) Acceleration (b) Speed (c) Speed and acceleration (d) Displacement Answer: (b) Speed Question# 5. The power of a n-phase circuit can be measured by using a minimum of (a) (n - 1) wattmeter elements (b) n wattmeter elements (c) (n + 1) wat...

Question # 1. In open loop system (a) the control action is independent of the output (b) the control action depends on system variables (c) the control action depends on the input signal (d) the control action depends on the size of the system Answer: (a) the control action is independent of the output Question # 2. Standard resistor is made from (a) platinum (b) maganin (c) silver (d) nichrome Answer:  (b) maganin Question # 3. Which of the following is the output of a thermocouple ? (a) Alternating current (b)  D.C. voltage (c) A.C. voltage (d) Direct current Answer:  (b)  D.C. voltage Question # 4. In a Weston frequency meter, the magnetic axes of the two fixed coils are (a) parallel (b)  inclined at 60° (c) perpendicular (d) inclined at 120° Answer: (c) perpendicular Question # 5. can be extended to systems which are time-varying ? (a) Bode-Nyquist stability methods (b) Transfer functions (c) Root l...

Question1:-The main advantage of CMOS is its  A:-Low power consumption  B:-High power rating  C:-Small signal operation  D:-Fast switching capability  Correct Answer:- Option-A Question2:-A lamp is controlled from two positions A and B (eg : staircase circuit). The boolean expression for the above circuit is  A:-  B:-  C:-  D:-  Correct Answer:- Option-B Question3:-Which one of the following is not written by Ponkunnam Varkey ?  A:-Vikarasadanam  B:-Nivedanam  C:-Aniyara  D:-Kudumbini  Correct Answer:- Option-D Question4:-The main constituents of a Portland Cement is  A:-lime  B:-Alumina  C:-Iron Oxide  D:-Alkalies  Correct Answer:- Option-A Question5:-Vagbhadanandha was the main disciple of  A:-Sree Narayanaguru  B:-Chattampi Swamikal  C:-Brahmananda Sivayogi  D:-V. T Bhattathiripad  Correct Answer:- Option-C Question6:-Monetary Mu...

PROVISIONAL ANSWER KEY Question Paper Code: 48/2017/OL Category Code: 065/2016 Exam: Draftsman (Architectural) Gr.I Medium of Question: English Date of Test 19-06-2017 Department PWD Architectural Wing Alphacode A Question1:-Which day is observed as National Voters Day ?  A:-September 14  B:-November 16  C:-January 25  D:-March 20  Correct Answer:- Option-C Question2:-Which year was the `5^(th)` and last visit of Gandhiji in Kerala ?  A:-1937  B:-1929  C:-1935  D:-1939  Correct Answer:- Option-A Question3:-Which Chinese traveller who visited Kerala in A.D. 1409 ?  A:-Xuan Zang  B:-Mahuvan  C:-Al-Masudi  D:-Fa-Hien  Correct Answer:- Option-B Question4:-Who wrote the book "Keralthinte Desa Namangal" ?  A:-S. K. Pottakkad  B:-K. Jayakumar  C:-Praveen Chandran  D:-Chattambi Swami  Correct Answer:- Option-D Question5:-Who established the Chala Bazar in Thiruvan...