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1 answer 8 views

In a three phase controlled bridge rectifier with an increase of overlap angles the output dc voltage

answered May 23, 2018 in Power Electronic Controlled Drives
1 answer 7 views

In a thyistorised converter a free wheeling diode is used to  A) Add to the conduction current ofthe thyristor B) Oppose the thyristor conduction C) Conduct current during the off period of the thyristor D) Protect the thyristor by providing a shunt path

answered May 20, 2018 in Power Electronic Controlled Drives
1 answer 20 views

In d.c. choppers, for periodic time T, the output voltage can be controlled by frequency modulation by varying

answered May 20, 2018 in Power Electronic Controlled Drives
1 answer 14 views

For speed control of ac drive, the preferred method using thyristors is  A) Phase control B) Integral cycle control C) Single pulse PWM control D) Sinusoidal PWM control

answered May 20, 2018 in Power Electronic Controlled Drives
1 answer 21 views

A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and armature resistance are 100 volt and 0.5Ω respectively. With the magnitude control ratio 0.6, the quadrant of operation DC motor is  (a) First (b) Second (c) Third (d) Fourth

answered May 15, 2018 in Power Electronic Controlled Drives
1 answer 8 views

The ripple factor of a bridge rectifier is  1.0.48 2.0.812 3. 1.11 4. 1.21 

answered May 13, 2018 in Power Electronic Controlled Drives
1 answer 25 views

A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% the power return to the DC supply is  (a) 78 kW (b) 58 kW (c) 38 kW (d) 48 kW

answered May 13, 2018 in Power Electronic Controlled Drives
1 answer 12 views

In static Kramer drive, motor turns ratio is 0.6, the firing angle is 120o. The motor slip is   (a) 0.633 (b) 0.533 (c) 0.833 (d) 0.733 

answered May 13, 2018 in Power Electronic Controlled Drives
1 answer 3 views

In v/f control method,   (a) The maximum torque decreases (b) The motor speed increases (c) The maximum torque is constant (d) The maximum torque increases

answered May 13, 2018 in Power Electronic Controlled Drives
1 answer 27 views

Specific energy consumption of an electric train is the ratio between (A) Specific energy output at driving wheels and efficiency of the traction motor (B) Specific energy output at driving wheels and efficiency of the transmission gear (C) Specific energy output of driving motor and efficiency of the driving wheels (D) Specific energy output at driving wheels and efficiency of the (motor + transmission gear)

answered Apr 28, 2018 in Power Electronic Controlled Drives
1 answer 53 views

In electric traction for a trapezoidal speed-time curve, the time period is (A) free running speed period = constant speed period (B) free running period = coasting period (C) free running period + coasting period = constant speed period (D) average speed period = scheduled speed period

answered Apr 28, 2018 in Power Electronic Controlled Drives
1 answer 57 views

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

answered Apr 28, 2018 in Power Electronic Controlled Drives
1 answer 20 views

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

answered Apr 28, 2018 in Power Electronic Controlled Drives
1 answer 18 views

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

answered Apr 28, 2018 in Power Electronic Controlled Drives
1 answer 40 views

RC triggering is preferred over resistance triggering because (A) it provides triggering at a precise instant (B) it gives a longer duration gate pulse (C) it enables triggering at a larger value of firing angle (D) it protects the SCR against high dv/dt

answered Apr 28, 2018 in Power Electronic Controlled Drives
1 answer 20 views

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

answered Apr 28, 2018 in Power Electronic Controlled Drives
2 answers 77 views
2 answers 46 views
1 answer 54 views

Slip-Energy Recovery (SER) scheme for three phase Induction Motor

answered Aug 25, 2017 in Power Electronic Controlled Drives
1 answer 35 views
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