ENGINEERING CAREER AND STUDY MATERIALS

1. The design of mechanical parts is particularly important in case of _____ speed machines. (a) low (b) high (c) medium (d) All the Above Answer: (b) high 2. A practical formula for determining the thickness of insulation between low voltage and high voltage windings is (a) 5 + 0.9 kV mm (6) 2 + 0.5 kVmm (c) 4 + 0.7 kV mm (d) 1 + 0.2 kVmm Answer: (a) 5 + 0.9 kV mm 3. For making a capacitor, it is better to select a dielectric having (a) low permittivity (b) permittivity slightly more than that of air

3531. The direction of electric field due +0 positive charge is . (a) towards the charge (b) away from the charge (c) both (a) and (6) (d) none of the above Correct Answer: (b) away from the charge 3532. For open control system which of the following statements is incorrect ? (a) Less expensive (b) Construction is simple and maintenance easy (c) Recalibration is not required for maintaining the required quality of the output (d) Errors are caused by disturbances Correct Answer: (c) Recalibration is not required for maintaining the required quality of the output 3533. Electrical machines having power outputs ranging from a few kW upto approximately 250 kW may be classified as (a) medium size machines (b) small size machines (c) large size machines

ELECTRICAL ENGINEERING QUESTION AND ANSWERS   From Question No. 3526 to3530 Electrical Questions with Answers published here. The Solved Electrical Engineering Question answers are very much useful for preparing the upcoming Recruitment Examinations   3526. In D.C. machines the usual limit of slot pitch is (a) between 5 to 10 mm (b) between 10 to 15 mm (c) between 15 to 20 mm (d) between 25 to 35 mm Answer: (d) between 25 to 35 mm ELECTRICAL ENGINEERING QUESTION AND ANSWERS -2019 3527. The lines of force due to charged particles are (a) always straight (b) sometimes curved (c) always curved (d) none of the above Answer: (c) always curved 3528. A controller, essentially, is a (a) sensor (b) clipper (c) amplifier (d) comparator Answer: (d) comparator ELECTRICAL ENGINEERING QUESTION AND ANSWERS-2021 3529. A Weston frequency meter is (a) moving iron instrument (b) moving coil instrument (c) dynamometer instrument (d) none of the...

3516. The household energy meter is (a) an integrating instrument (b) a recording instrument (c) an indicating instrument (d) none of the above Answer: (a) an integrating instrument 3517. Which of the following devices is used for conversion of co-ordinates ? (a) Microsyn (b) Synchro-resolver (c) Selsyn (d) Synchro-transformer Answer: (b) Synchro-resolver 3518. Induction type single phase energy meters measure electric energy in (a) kW (b) Wh (c) VAR (d) kWh

Question No. 3521.  For power factor correction, synchronous motors operate at (a) normal load with zero excitation (b) no-load and under-excited fields (c) normal load with minimum excitation (d) no-load and greatly over-excited fields Answer: (d) no-load and greatly over-excited fields Question No. 3522.  The field coils of D.C. generator are usually made of (a)  copper (b) mica (c) cast iron (d) carbon Answer: (a)  copper Question No. 3523. An amplidyne can give which of the following characteristics ? (a) Constant current (b) Constant current, constant voltage and constant power (c) Constant current as well as constant voltage

35 11. The electric field at a point situated at a distance d from straight charged conductor is (a) proportional to d (b) inversely proportional to d (c) inversely proportional to d (d) none of the above Answer: (c) inversely proportional to d 35 12 __________ is the common method of applying brushes to the commntator. (a) Radial (b) Reaction (c) Trailing (d) All of the above Answer: (d) All of the above 35 13. An open coil has (a) zero resistance and inductance (b) zero resistance and high inductance (c) infinite resistance and normal inductance

3506 . The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. If the distance is reduced to 2 metres, the field intensity will be (a) 400 N/C (b) 600 N/C (c) 800 N/C (d) 1100 N/C Answer: (c) 800 N/C 3507 . A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ? (a) 0.5 s (b) 0.1 s (c) 0.01 s (d) 55 s Answer: (a) 0.5 s 3508 . Which ofthe following materials is used in the manufacture of resistance grids to be used in the starters of large motors ? (a) Copper (b) Cast-iron

3501. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon (a) pole strength of the magnet (b) motion of the magnet (c) number of turns of the coil (d) resistance of the coil Answer: (d) resistance of the coil 3502. The weight of copper of both armature and field windings decreases with _____ in number of poles. (a) decrease (b) increase (c) either of the above (d) none of the above Answer: (b) increase 3503. Which of the following is the unit of magnetic flux density ? (a) tesla (b) lumens (c) weber (d) none of the above Answer: (a) tesla 3504.  Substances which have permeability less than the permeability of free space are known as (a) ferromagnetic (b) paramagnetic

1. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ? a) Lap winding b) Wave winding c) Either of (a) and (b) above d) Depends on other features of design Answer: b) Wave winding 2. The operation of a D.C. machine with large air gap lengths is comparatively a) quiet b) noisy c) either of the above d) none of the above Answer: a) quiet 3. For which of the following applications a D.C. motor is preferred over an A.C. motor ? a) Variable speed operation b) High speed operation c) Low speed operation d) Fixed speed operation Answer: a) Variable speed operation 4. The stator of a D.C. machine comprises of a) main poles 6) interpoles

1. What is the mejority charge carrer of p-type semiconductor ? i)Holes ii)Electrons iii)Protons v)Nuetrons 2. which of the following electrical conductor used in a Battery ? 1 Gas 2 water 3 silver 4 Aluminium. 3. what is the lightning arrester maximum voltage is→_____ a . below 10KV b. 10KV c. 100 kv d. above 100MV 4. The magniture of XL increases by increasing 1. Voltage 2. Current

Consider the following passage and answer the questions that follow accordingly. Humans may have reached northern Europe (including England) 200 000 years earlier than previously thought. Stone tools found in England suggest that early humans were there 700 000 years ago. The stone tools were discovered at a site in Suffolk. The tools have been dated using several methods. Firstly, the magnetic polarity of iron-containing minerals in the sedimentary rocks where the tools were found is aligned north-south, just as it is today. Since the Earth’s magnetic field underwent a polarity reversal 780 000 years ago, the site must be younger than that. The tools were found beneath glacial ice deposits laid down during a period 450 000 years ago when the region was blanketed in ice, so they must be older than this. Also present at the site were fossils of a water vole Mimomys, which was superseded by another vole species called Arvicola around 500 000 years ago. A new amino-acid dating techniqu...

1.  The woman in the cartoon has found the man’s ‘private heartache’ a. confusing. b. intriguing. c. distressing. d. uninteresting. Answer:  d. uninteresting. 2. The woman suggests that, for a first date, the man has a. lacked generosity. b. revealed too much about himself. c. been too reserved. d. chosen an inappropriate venue. Answer:  b. revealed too much about himself.

1. Which of the following metals cannot be produced by aqueous electrolysis? (A) Zinc (B) Copper (C) Gold (D)  Aluminium Answer: (D)  Aluminium 2. The carbon content of low carbon, medium carbon and high carbon steel are respectively. (A) (0-0.1)%; (0.1 – 0.4)% and (0.4 – 1.8)% (B) (0.25-0.4) %; (0.4 – 0.7)% and (0.7 – 1.7)% (C)  Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)% (D) None of these Answer: (C)  Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)% 3. Fracture stress for a brittle material having a crack length of 1 µm is 200 MPa. Fracture stress for the same material having a crack length of 4 µm is (A) 200 MPa  (B) 150 MPa (C) 100 MPa (D) 50 MPa

1. The insulation between the commutator systems is- a) Glass (b) Bakelite (c) Mica  (d) Wood Answer: (c) Mica  2.What will be total emf, if 4 cell of 1.5V each are connected in series - a) 3V b) 9 v c) 6V d) 0.375V Answer: c) 6V 3.Winding of armature of motor, the wire used is- a) Copper wire b) fuse wire c) aluminium wire d) super enameled insulated copper wire

Question: Function of Choke in the fluorescent tube circuit is to - (a)Suppress the starting surge (b) Reduce the starting current               (c) Reduce the flickering (d) Initiate the arc and stabilize it Answer:  (d) Initiate the arc and stabilize it