Power Electronics - Study Mode

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[#91] Consider the following statements: 1. Speed of operation of MOSFET is more than the speed of operation of SCR. 2. SCRs have lower power loss than MOSFETs. 3. The current in conducting state can easily be controlled through the gate in SCR. 4. MOSFET is not a current-triggered device. The correct statements are:

(A) 1 and 4 only

(B) 1 and 2 only

(C) 2 and 3 only

(D) 1, 2, 3 and 4

Correct Answer

(A) 1 and 4 only

[#92] Following are the applications of a Buck and Boost converters respectively 1. Regulated DC power supplies 2. Regenerative braking of DC motors 3. DC motor speed control

(A) 1, 2

(B) 2, 3

(C) 1, 3

(D) 2, 1

Correct Answer

(A) 1, 2

[#93] SCR can be used in

(A) oscillator

(B) regulator

(C) amplifier

(D) light dimming

Correct Answer

(B) regulator

[#94] The primary function of a phase inverter is to change the phase of a signal by

(A) 90°

(B) 120°

(C) 360°

(D) 180°

Correct Answer

(D) 180°

[#95] Match List-I with List-II and select the correct answer using the options given below: List-I (Power Device) List-II (Maximum operation frequency) a. Bipolar transistors 1. 1 MHz b. Power MOSFET 2. 100 kHz c. Silicon controlled rectifier 3. 1 kHz d. Insulated gate bipolar transistor 4. 10 kHz

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

(B) a-4, b-1, c-3, d-2

(C) a-3, b-1, c-4, d-2

(D) a-4, b-2, c-3, d-1

Correct Answer

(C) a-3, b-1, c-4, d-2