Question 1 : The improved version of the UJT oscillator triggering circuit is the
1. ramp & pedal triggering
2. rc triggering
3. cosine-pulse triggering
4. ramp triggering
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Question 2 : The magnitude of gate voltage and gate current for triggering an SCR is
1. inversely proportional to the temperature
2. directly proportional to the temperature
3. inversely proportional to the anode current requirement
4. directly proportional to the anode current requirement
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Question 3 : ___________ commutation technique is commonly employed in series inverters.
1. line
2. load
3. forced
4. external-pulse
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Question 4 : Class E commutation is a/an
1. line commutation technique
2. load commutation technique
3. forced commutation technique
4. external-pulse commutation technique
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Question 5 : In case of a cosine firing scheme, __________ is used to get a cosine wave
1. ic 555
2. a comparator
3. an integrator circuit
4. a differentiator circuit
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Question 6 : In case of class A type commutation or load commutation with low value of R load the
1. L is connected across R
2. L-C is connected across R
3. L is connected in series with R
4. L-C is connected in series with R
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Question 7 : In the UJT firing circuit, the pulses are generated while the
1. capacitor charges
2. capacitor discharges
3. capacitor voltage is zero
4. there is no capacitor in a UJT firing circuit
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Question 8 : In a resistance firing circuit the firing angle
1. cannot be greater than 120°
2. cannot be greater than 90°
3. cannot be greater than 180°
4. cannot be greater than 160°
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Question 9 : In case of a R firing with R2 as the variable resistance, V_gp (peak of gate voltage) and V_gt (gate triggering voltage) the value of R2 is so adjusted such that
1. V_gp = V_gt
2. V_gp > V_gt
3. V_gp < V_gt
4. V_gp = V_gt = 0
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Question 10 : In the thyristor gating circuit, the supply to the pulse amplifier is provided by the
1. zcd
2. isolation transformer
3. synchronizing transformer
4. control signal generator
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