GATE Electrical Engineering Paper Test 1 Online

1. A control system having unit damping factor will give

2. The term ‘artificial aging’ in instrument is associated with

3. The Hall Effect voltage in intrinsic Silicon

4. Which of the following serve as a donar impurity in Silicon?

5. In type-I system, a constant output velocity at steady state will be possible when

6. A dc shunt motor runs at 500 rpm at 220 V.A resistance of 4.5 Ω is added in series with the armature for speed control. The armature resultance is 0.5 Ω. The current to stall the motor will be

7. Which of the following tests can be conducted another than shunt m/c?

8. The maximum theoretical efficiency of a class B push-pull transistor amplifier is approximately

9. A squre matrix is called singular it is

10. If an induction machine is run at above synchronous speed it acts as

11. The use of high speed C.B.

12. The Thevenin impedance across the terminals AB of the given network is

13. The electrical conductivity of metals is typically of the order of (in Ω⁻¹ m⁻¹)

14. The circuit shown in the figure below represents a feedback amplifier. For this circuit, the current and voltage gains would respectively be

15. The efficiency of two identical transformers under conditions can be determined by

16. Which material is generally used for LED?

17. The stator of a 2/4 pole changing cage motor is initially would for 2-poles. The reconnection of the stator winding to 4-poles through a change over, switch, while the motor is running, would result in

18. Cascade amplitude are used on

19. The low voltage winding of a 400/230, 1-ф, 50 Hz transformer is to be connected to a 25 Hz supply, at 25 Hz the supply voltage should be

20. The Laplace transform of V(t) shown in the figure is

(a) V/s e⁻^s – 3V/s e⁻²^s

(b) 2V/s – 3V/s e⁻²^s

(c) 2V/s + V/s e⁻²^s

(d) 2V/s + V/s e⁻²^s – 3V/s e⁻²^s

21. In the circuit shown in the figure, the expression for I_o/I_i is

(a) R_L/R_L + R

(b) R_f/R_L

(c) 1 + R_f/R_L

(d) 1 – R_f/R_L

22. Reactance relay is normally preferred for protection against

23. The stator and rotor pole numbers may be different in a

24. A point charge Q is located on the surface of a sphere of radius R as shown in the figure. The average electric field on the surface of the sphere will be

25. The sum of the gains of the feedback paths in the signal flow graph below is

26. A 9-pole, 50 Hz 1-ф I.M. runs at a speed of 950 rpm. The frequency/frequencies of current in the cage rotor will be

27. By a suitable choice of the scalar parameter k, the system shown in the given figure can be made to oscillate continuously at a

28. In the circuit shown in the flg, the switch S has been open for a long time. It is closed at t = 0. For t > 0 the current flowing through the inductor will be given by

(a) i_L (t) = 1.2 + 0.8 e⁻²^t

(b) i_L (t) = 0.8 + 1.2 e⁻²^t

(c) i_L (t) = 1.2 – 0.8 e⁻²^t

(d) i_L (t) = 0.8 – 1.2 e⁻²^t

29. The intersection of root locus branches with the imaginary axis can be determined by use of

30. In a transformer if the iron losses and copper losses are 40.5 kW and 50 kW respectively, then at what function of load will the efficiency be maximum?

31. Condition x ≠ y is programmed as

32. A subroutine can return

33. A voltage V = 400 sin 314. 16t is applied to a 1-ф transformer on no-load. If the no load current of the transformer is 2 sin (314.16 t – 85°), the magnetization branch impedance will be approximately equal to

34. In the given circuit, the voltage across the 2Ω resistor is

35. The driving point impedance of the circuit shown in the figure is

36. Magnetostriction

37. For a fault at the terminals of a synchronous generator, the fault current is maximum for a

38. Bundled conductors are employed to improve the

39. The input impedance of a CRO is nearly

40. In the circuit shown in the fig. V_s = V_m sin 2t and Z₂ = 1 + j. The value of C is chosen such that the current 1 is in phase with Vs. The value of c (in farads) is