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Q. 131) SCR is uni-directional in nature.

(A) True

(B) False

(D) all

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Q. 132) Which of the following device should be used as a switch in a low power switched mode power supply (SMPS)?

(A) GTO

(B) BJT

(D) TRIAC

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Q. 133) Servo motors are an example of which type of load?

(A) Pulsating loads

(B) Short time loads

(D) Short time intermittent loads

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Q. 134) Load torque of the crane is independent of _________

(A) Speed

(B) Seebeck e�ect

(D) Thomson e�ect

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Q. 135) The unit of angular velocity is rad/s .

(A) True

(B) False

(D) all

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Q. 136) R.M.S value of the sinusoidal waveform V=V sin(ωt+α).

(A) V ÷2

(B) V ÷2

(D) V ÷3

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Q. 137) Calculate the time period of the waveform x(t)=24sin(24πt+π÷4).

(A) .064 sec

(B) .047 sec

(D) .015 sec

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Q. 138) The turn-o times of the devices in increasing order is ___________
I. MOSFET
II. BJT
III. IGBT
IV. Thyristor

(A) I, III, II, IV

(B) I, II, III, IV

(D) III, II, IV, I

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Q. 139) Which of the following devices should be used as a switch for high power and high voltage application?

(A) GTO

(B) MOSFET

(D) Thyristor

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Q. 140) Calculate the useful power developed by a motor using the given data: P = 3000 W, I = 60 A, R = .4 Ω. Assume frictional losses are 200 W and windage losses are 400 W.

(A) 970 W

(B) 960 W

(D) 990 W

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