23-08-2013, 02:41 PM
TRADE TEST FOR JUNIOR PLANT ATTENDENT (ELECTRICAL)
TRADE TEST.docx (Size: 26.71 KB / Downloads: 19)
ANSWER ALL QUESTIONS. EACH QUESTION CARRIES 0.5 MARK
1. Inductance is defined as
A) Rate of chance of flux B) Rate of chance of current
C) Rate of chance of emf D) chance of flux linkages per ampere
2. The current in a circuit doubles when the resistance
A) Reduces to half B) Reduces to four times
C) Increases to four times D) increases to two times
3. A D.C. motor starter is used to limit its
A) Starting speed B) Starting current
C) Starting acceleration D) Starting torque
4. The purpose of brush in a D.C. Machine is
A) To collect current from the commutator B) Collect voltage from commutator
C) Provides connection between segment & commutators D) Clear the commutator
5. The most effective damping is
A) Fluid friction B) electrical magnetic
C) Pneumatic D) Eddy current
6. Electro static instruments are used for
A) low current measurement B) high current measurement
C) high voltage measurement D) low voltage measurement
7. _________ will work only on D.C.
A) Electric lamp B) Refrigerator
C) Heater D) electro plating
8. The power transformer is a
A) Constant voltage device B) Constant flux device
C) Constant current device D) Constant power device
9. The losses of a transformer is does not depends on
A) Current B) load
C) Power factor D) All the above
10. In a transformer the resistance between primary and secondary is
A) Zero B) 100
C) 1 K D) infinity
11. the squirrel cage induction motor, the rotor slots are usually given slight skew in order to
A) reduce magnetic hum B) reduce winding loss
C) reduce eddy current loss D) reduce accumulation of dust & dirt
12. Single phase induction motor is a
A) self starting B) not self starting
C) requires only one winding D) it rotates only one direction
13. Universal motor can run on
A) AC only B) DC only
C) either AC or DC D) in the universe
14. Synchronous motor can operate at
A) lagging PF only B) leading PF only
C) lagging, leading and unity PF D) unity PF
15.the rotor of synchronous motor is
A)salient type B) non-salient type
C) Identical to that of DC motor D) none
16.Material used for insulator is
A) Porcelain B) Silica
C) Cement D) clay
17.Rectifier converts
A) DC to AC B) AC to DC
C) fixed AC to variable AC D) Fixed DC to Variable DC
18. the function of transistor is
A) Amplification B) rectification
C) both A & B D) none
19. In the BJT the current is due to
A) holes B) electrons
C) both holes & electrons D) none
20. identify the pair of basic gates from the following
A) OR , NOR B) NAND , AND
C) AND, NOT D) NOT, NAND
21. Find the value of stress, when the load is 200 N and Area is 200 cm X 100 cm
A) 0.01 N/m2 B) 100 N/m2
C) 0.01 MPa D) 0.01 Kpa
22. what are the units for pressure
A) torr B) mm of water
C) mm of Hg D) All the above
23. solve 0.005X0.0001X2000 =
A) 0.000001 B) 0.0001
C) 0.001 D) 0.010
24. The most commonly used angle of projection is
A) I angle of projection B) II angle of projection
C) III angle of projection D) IV angle of projection
25. The force is defined according to….
A) First Newton law of motion B) II Newton law of motion
C) III Newton law of motion D) IV Newton law of motion