# Test: Power Electronics & Drives- 1

## 10 Questions MCQ Test GATE Electrical Engineering (EE) 2023 Mock Test Series | Test: Power Electronics & Drives- 1

Description
Attempt Test: Power Electronics & Drives- 1 | 10 questions in 30 minutes | Mock test for GATE preparation | Free important questions MCQ to study GATE Electrical Engineering (EE) 2023 Mock Test Series for GATE Exam | Download free PDF with solutions
QUESTION: 1

Solution:
QUESTION: 2

Solution:

QUESTION: 3

### Match List-I (Waveforms) with List-II (Descriptions) and select the correct answer: List 1: A.  B.  C.  D.  List-II 1. Single phase fully controlled ac to dc converter 2. Voltage commutated dc to dc chopper with input dc voltage E 3. Phase voltage of a three phase inverter with 180° conduction and input dc voltage E 4. Line voltage of a three phase inverter with 120° conduction and input dc voltage E 5. Three-phase diode bridge rectifier

Solution:
QUESTION: 4

A single phase ac voltage controller  feeding a pure resistance  load has a load voltage of 200 V(rms) when fed from a source  of 250 V(rms). The input power factor of the controller is

Solution:

QUESTION: 5

In a thyristor-controlled rectifier, the firing  angle of thyristor  is to be controlled in the range of

Solution:
QUESTION: 6

A 3-phase wound rotor induction motor is controlled by a  chopper-controlled resistance in its rotor circuit. A resistance  of 2Ω is connected in the rotor circuit and a resistance of 4Ω is additionally  connected during OFF periods of the chopper.  The OFF period of the chopper is 4 ms. The average  resistance in the rotor  circuit for the chopper frequency of   200 Hz is

Solution:

Chopper frequency = 200 Hz
Time period of chopper (T) = 1/200 = 5 ms

Chopper OFF period = 4 ms

QUESTION: 7

The most suitable device for high frequency inversion in  SMPS is

Solution:

MOSFETs have the lowest switching
losses so they are the most suitable devices
for the SMPS.

QUESTION: 8

In a self-controlled synchronous motor fed from a variable frequency inverter

Solution:
QUESTION: 9

in case of voltage source inverter, freewheeling diode can be avoided for the load of

Solution:
QUESTION: 10

A single-phase full-bridge converter with a free-wheeling  diode feeds an inductive load. The load resistance is 15.53Ω and it has a large inductance providing constant and ripple  free d.c. current. Input to converter is from an ideal 230V,  50Hz single phase source. For a firing delay  angle of 60°, the  average value of diode current is

Solution:

V0 for a single-phase full-bridge converter
with a free-wheeling diode

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