Quiz: Electrical Engineering 15 June 2021

Quiz Electrical Engineering
Exam: GATE
Topic: Miscellaneous
Date: 15/06/2021

Each Question carries 2 Mark
Negative Marking: 1/3
Time: 20 Minutes

Q1. A single-phase load is supplied by a single-phase voltage source. If the current flow from load to the source is 10∠-150⁰ A and if the voltage at the load terminal is 100∠60⁰, then the
(a) Load absorbs real power and absorbs reactive power
(b) Load delivers real power and delivers reactive power
(c) Load absorbs real power and delivers reactive power
(d) Load delivers real power and absorbs reactive power

Q2. Surge impedance loading of a transmission line can be increased by:
1.Decreasing its voltage level
2. Reducing the length of the line
(a) Only 1 is correct
(b) Only 2 is correct
(c) Both 1 and 2 are correct
(d) Both 1 and 2 are incorrect

Q3. For a graph of power system network shown in figure, where bus numbers and impedances are marked, assuming equal R/X of impedances, find the bus impedance matrix Z_22.

(a) 0.5
(b) 2.0
(c) 3.5
(d) 4.5

Q4. Find the value of emitter current (I_E) for a BJT with α=0.90 & I_B=10 µA ?
(a) 10 µA
(b) 100 µA
(c) 50 mA
(d) 100 mA

Q5. The value of current I_1 and I_2 respectively in the circuit given below-

(a) 1 A ,3 A
(b) 4 A, 3 A
(c) 2 A, 1 A
(d) 3 A, 2 A

Q6. A coil of 100 turns is rotated at 1200 rpm in a magnetic field having uniform density of 0.04 T. therefore, the value of frequency is……………….
(a) 20 Hz
(b) 25 Hz
(c) 30 Hz
(d) 50 Hz

Q7. A GTO can be turned on by applying
(a) Positive gate signal
(b) Positive drain signal
(c) Positive source signal
(d) dNone of the above

Q8. A single-phase half wave rectifier is feeding a resistive load. When α = 0, dc output voltage is 127 V. When α = 30°, the dc output voltage will be about
(a) 127
(b) 119
(c) 110
(d) 100

Q9. Schering bridge is used to measure
(a) Dielectric loss
(b) The inductance
(c) Low resistance
(d) Mutual Inductance

Q10. If a resistance is inserted in the rotor circuit of a slip ring induction motor, then compared to direct line starting:
(a) Both the starting current and torque reduce
(b) Both the starting current and torque increase
(c) The starting current reduces but starting torque increases
(d) The starting current reduces but starting torque

SOLUTIONS

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