ENGINEERING CAREER AND STUDY MATERIALS

Question #1. In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made (a) equal to that of armature mmf (b) less in comparison with the arma¬ture mmf (c) large in comparison with the arma-ture mmf (d) none of the above Answer: (c) large in comparison with the arma-ture mmf Question #2. For measurements on high voltage capacitors, the suitable bridge is (a) Wein bridge (b) Modified De Santy's bridge (c) Schering bridge (d) Any of the above (e) None of the above Answer: (c) Schering bridge Question #3. A signal other than the reference input that tends to affect the value of controlled variable is known as (a) disturbance (b) command (c) control element (d) reference input Answer: (a) disturbance Question #4. By which of the following methods the temperature rise of windings and other parts may be determined ? (a) Thermometer method (6) Resistance method

Question # 1. signal will become zero when the feedback signal and reference signs are equal. (a) Input (b) Actuating (c) Feedback (d) Reference Answer: (b) Actuating Question # 2. The distance between the starts of two consecutive coils measured in terms of coil sides is called (a) front pitch (b) winding pitch (c) commutator pitch (d) back pitch Answer: (b) winding pitch Question # 3. In a D.C. machine the number of brush arms is _____ the number of poles. (a) less than (b) greater than (c) equal to (d) none of the above Answer: (c) equal to Question # 4. The phase lag produced by transportation relays (a) increases linearly with frequency (b) is inverseh'proportional to frequency (c) is independent of frequency (d) decreases linearly with frequency Answer: (a) increases linearly with frequency Question # 5. _____ instruments are those which measure the total quantity of electricity delivered in a particular time. (a) Absolute (b) Indicating

1. In ________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft. (a) small (b) medium (c) large (d) any of the above. Answer: (c) large 2. Materials exhibiting zero value of resistivity are known as ______ . (a) conductors__ (b) superconductors (c) insulators (d) semiconductors Answer: (b) superconductors 3. A control system in which the control action is somehow dependent on the output is known as (a) Open system (b) Semiclosed loop system (c) Closed loop system (d) None of the above Answer: (c) Closed loop system 4. Which of the following methods does not take into account the maximum temperature rise under variable load conditions ? (a) Method of average losses (b) Equivalent current method

Question 1:-Identify the hardest tool material  A:-Steel  B:-Ceramics  C:-Tungston carbide  D:-Diamond  Correct Answer:- Option-D Question 2:-The essential constituent of any hardened steel is  A:-Austenite  B:-Cementite  C:-Martensite  D:-Pearlite  Correct Answer:- Option-C Question 3:-The collapsible tooth paste tube are made by  A:-Drawing  B:-Deep drawing  C:-Rolling  D:-Extrusion  Correct Answer:- Option-D Question 4:-The vertical passage for bringing molten metal to mould cavity is called  A:-Sprue  B:-Riser  C:-Gate  D:-Chaplet

1. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ? (a) Absolute instruments (b) Recording instruments (c) Indicating instruments (d) Integrating instruments Answer: (c) Indicating instruments 2. In closed loop control system, with positive value of feedback gain the overall gain of the system will (a) decrease (b) increase (c) be unaffected (d) any of the above Answer: (a) decrease 3. For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used ? (a) 1.0 to 1.2 A/mm2 (b) 1.5 to 2.0 A/mm2

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