JELET 2020 MOCKTEST (FREE) FOR JELET ASPIRANTS

JELET 2020 MOCKTEST

(FREE MOCKTEST OF JELET 2020)

E.TECH  FREE MOCKTEST FOR JELET 2020

1. In a series circuit on resonance, following will occur

a) V = V_R                                                            b) X_L = X_c

c) Z = R                                                              d) V_L = V_C

e) All above

2. Capacitors for power factor correction are rated in

a) kW                                                  b) kVA

c) kV                                                   d) kVAR

3. For the full wave rectified sine wave the r.m.s value is

a) 0.707I_max                                       b) 0.636I_max

c) 0.318I_max                                       d) Zero

4. The dynamic impedance of an R-L and C parallel circuit at resonance is …….. ohm

a) R/LC                                               b) C/LR

c) LC/R                                               d) L/CR

5. At half-power points of a resonance curve, the current is …….. times the maximum current

a) 1/2                                                 b) 1/ 

c)                                                   d) 2

6. When two wave are in phase they have peak values at an intervals of

a) 180                                                              b) 120

 c) 90                                                                d) None of the above

7. If ‘t’ be the thickness of laminatins, the eddy current loss in the generator will vary as

a) 1/t                                                  b) 1/t²

c) t                                                      d) t²

8. If I_a be the armature current, then speed of D.C shunt motor is

a) Independent of I_a                        b) Proportional I_a

c) Varies as (I_a)²                                d) Varies as 1/I_a

9. The speed of motor falls from 1100 r.p.m. at no load to 1050 r.p.m. at rated load. The speed regulation of motor is

a) 2.36%                                            b) 4.76%

c) 6.77%                                             d) 8.74%

10. If I,R and t are the current, resistance and time respectively, then according to Joules

 law heat produced will be proportional to

a) I²Rt                                  b) I²Rt²

c) I²R²t                                 d) I²R²t²

11. The number of electrons in outer most orbit of carbon atom is

a) 3                                      b) 4

c) 6                                       d) 7

12. 1 angstrom is equal to

a) 10^-8 mm                          b) 10^-6 mm

c) 10^-10 mm                        d) 10^-14 mm

13. Insulating materials have the function of

a) Preventing a short circuit between conducting wires

b) Preventing a open circuit between the voltage source and the load

c) Conducting very large currents

d) Storing very high currents

14. The weight of an aluminium conductor as compared to a copper conductor of

 identical cross-section, for the same electrical resistance, is

a) 50 %                                b) 60 %

c) 100 %                              d) 150 %

15. An open resistor, when checked with an ohm-meter reads

a) Zero                                b) infinite

c) High but within tolerance

d) Low but not zero

16. Resistance of the carbon filament lamp …… as the applied voltage increases.

a) Increases                       b) Decreases

c) Remains same               d) None of the above

17. Copper wire of certain length and resistance is drawn out to three times its

length without change in volume, the new resistance of wire becomes

a) 1/9 times                       b) 3 times

c) 9 times                            d) unchanged

18. Which of the following relation is incorrect?

a) P = VI                              b) P = I²R

c) P = V/R²                          d) P = V²/R

19. All of the following are equivalent to watt expect

a) (amperes)² ohm            b) joules/sec.

c) amperes × volts            d) amperes/volt

20. Four wires are same material, the same cross sectional area and same length when connected in parallel give a resistance of 0.25 Ω. If the same four wires are connected

 in series the effective resistance will be

a) 1Ω                                   b) 2Ω

c) 3Ω                                    d) 4Ω

21. A 3Ω resistor having 2 A current will dissipate the power of

a) 2 watts                           b) 4 watts

c) 6 watts                           d) 8 watts

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